A record of nootropics I have tried, with thoughts about which ones worked and did not work for me. These anecdotes should be considered only as anecdotes, and one’s efforts with nootropics a hobby to put only limited amounts of time into due to the inherent limits of drugs as a force-multiplier compared to other things like programming1; for an ironic counterpoint, I suggest the reader listen to a video of Jonathan Coulton’s “I Feel Fantastic” while reading.

# Background

Your mileage will vary. There are so many parameters and interactions in the brain that any of them could be the bottleneck or responsible pathway, and one could fall prey to the common U-shaped dose-response curve (eg. Yerkes-Dodson law; see also “Chemistry of the adaptive mind” & de Jongh et al 2007) which may imply that the smartest are those who benefit least23 but ultimately they all cash out in a very few subjective assessments like ‘energetic’ or ‘motivated’, with even apparently precise descriptions like ‘working memory’ or ‘verbal fluency’ not telling you much about what the nootropic actually did. It’s tempting to list the nootropics that worked for you and tell everyone to go use them, but that is merely generalizing from one example (and the more nootropics - or meditation styles, or self-help books, or “getting things done” systems - you try, the stronger the temptation is to evangelize). The best you can do is read all the testimonials and studies and use that to prioritize your list of nootropics to try. You don’t know in advance which ones will pay off and which will be wasted. You can’t know in advance. And wasted some must be; to coin a Umeshism: if all your experiments work, you’re just fooling yourself. (And the corollary - if someone else’s experiments always work, they’re not telling you everything.)

The above are all reasons to expect that even if I do excellent single-subject design self-experiments, there will still be the old problem of “internal validity” versus “external validity”: an experiment may be wrong or erroneous or unlucky in some way (lack of internal validity) or be right but not matter to anyone else (lack of external validity). For example, alcohol makes me sad & depressed; I could run the perfect blind randomized experiment for hundreds of trials and be extremely sure that alcohol makes me less happy, but would that prove that alcohol makes everyone sad or unhappy? Of course not, and as far as I know, for a lot of people alcohol has the opposite effect. So my hypothetical alcohol experiment might have tremendous internal validity (it does prove that I am sadder after inebriating), and zero external validity (someone who has never tried alcohol learns nothing about whether they will be depressed after imbibing). Keep this in mind if you are minded to take the experiments too seriously.

Somewhat ironically given the stereotypes, while I was in college I dabbled very little in nootropics, sticking to melatonin and tea. Since then I have come to find nootropics useful, and intellectually interesting: they shed light on issues in philosophy of biology & evolution, argue against naive psychological dualism and for materialism, offer cases in point on the history of technology & civilization or recent psychology theories about addiction & willpower, challenge our understanding of the validity of statistics and psychology - where they don’t offer nifty little problems in statistics and economics themselves, and are excellent fodder for the young Quantified Self movement4; modafinil itself demonstrates the little-known fact that sleep has no accepted evolutionary explanation. (The hard drugs also have more ramifications than one might expect: how can one understand the history of Southeast Asia and the Vietnamese War without reference to heroin, or more contemporaneously, how can one understand the lasting appeal of the Taliban in Afghanistan and the unpopularity & corruption of the central government without reference to the Taliban’s frequent anti-drug campaigns or the drug-funded warlords of the Northern Alliance?)

## Golden age

Nootropics have been around a long time, but they’ve never been so prominent, easily accessed, cheap, or available in such a variety. I think there is no single factor responsible but rather existing trends progressing to the point where it’s possible to obtain much more obscurer things than before.

(In particular, I don’t think it’s because there’s a sudden new surge of drugs. FDA drug approval has been decreasing over the past few decades, so this is unlikely a priori. More specifically, many of the major or hot drugs go back a long time. Bacopa goes back millennia, melatonin I don’t even know, piracetam was the ’60s, modafinil was ’70s or ’80s, ALCAR was ’80s AFAIK, Noopept & coluracetam were ’90s, and so on.)

What I see as being the relevant trends are a combination of these trends:

1. the rise of IP scofflaw countries which enable the manufacture of known drugs: India does not respect the modafinil patents, enabling the cheap generics we all use, and Chinese piracetam manufacturers don’t give a damn about the FDA’s chilling-effect moves in the US. If there were no Indian or Chinese manufacturers, where would we get our modafinil? Buy them from pharmacies at $10 a pill or worse? It might be worthwhile, but think of the chilling effect on new users. 2. along with the previous bit of globalization is an important factor: shipping is ridiculously cheap. The most expensive S&H in my modafinil price table is ~$15 (and most are international). To put this in perspective, I remember in the ‘90s you could easily pay $15 for domestic S&H when you ordered online - but it’s 2013, and the dollar has lost at least half its value, so in real terms, ordering from abroad may be like a quarter of what it used to cost, which makes a big difference to people dipping their toes in and contemplating a small order to try out this ’nootropics’ thing they’ve heard about. 3. as scientific papers become much more accessible online due to Open Access, digitization by publishers, and cheap hosting for pirates, the available knowledge about nootropics increases drastically. This reduces the perceived risk by users, and enables them to educate themselves and make much more sophisticated estimates of risk and side-effects and benefits. (Take my modafinil page: in 1997, how could an average person get their hands on any of the papers available up to that point? Or get detailed info like the FDA’s prescribing guide? Even assuming they had a computer & Internet?) 4. the larger size of the community enables economies of scale and increases the peak sophistication possible. In a small nootropics community, there is likely to be no one knowledgeable about statistics/experimentation/biochemistry/neuroscience/whatever-you-need-for-a-particular-discussion, and the available funds increase: consider /r/Nootropics’s testing program, which is doable only because it’s a large lucrative community to sell to so the sellers are willing to donate funds for independent COAs to be done. If there were 1000 readers rather than 23,295, how could this ever happen short of one of those 1000 readers being very altruistic? 5. Nootropics users tend to ‘stick’. If modafinil works well for you, you’re probably going to keep using it on and off. So simply as time passes, one would expect the userbase to grow. Similarly for press coverage and forum comments and blog posts: as time passes, the total mass increases and the more likely a random person is to learn of this stuff. ## Defaults I do recommend a few things, like modafinil or melatonin, to many adults, albeit with misgivings about any attempt to generalize like that. (It’s also often a good idea to get powders, see the appendix.) Some of those people are helped; some have told me that they tried and the suggestion did little or nothing. I view nootropics as akin to a biological lottery; one good discovery pays for all. I forge on in the hopes of further striking gold in my particular biology. Your mileage will vary. All you have to do, all you can do is to just try it. Most of my experiences were in my 20s as a right-handed 5’11 white male weighing 190-220lbs, fitness varying over time from not-so-fit to pretty fit. In rough order of personal effectiveness, I rank them as follows: (People aged <=18 shouldn’t be using any of this except harmless stuff - where one may have nutritional deficits - like fish oil & vitamin D & maybe melatonin, if they’re otherwise screwing themselves over with sleep deficits thanks to school schedules & electronics use. Changes in effects with age are real - amphetamines’ stimulant effects and modafinil’s histamine-like side-effects come to mind as examples.) # Acetyl-l-carnitine (ALCAR) No effects, alone or mixed with choline+piracetam. This is pretty much as expected from reports about ALCAR (Examine.com), but I had still been hoping for energy boosts or something. (Bought from Smart Powders.) # Adderall Adderall is a mix of 4 amphetamine salts (FDA adverse events), and not much better than the others (but perhaps less addictive); as such, like caffeine or methamphetamine, it is not strictly a nootropic but a cognitive enhancer and can be tricky to use right (for how one should use stimulants, see “How To Take Ritalin Correctly”). I ordered 10x10mg Adderall IR off Silk Road (Wikipedia). On the 4th day after confirmation from seller, the package arrived. It was a harmless looking little padded mailer. Adderall as promised: 10 blue pills with markings, in a double ziplock baggy (reasonable, it’s not cocaine or anything). They matched pretty much exactly the descriptions of the generic I had found online. (Surprisingly, apparently both the brand name and the generic are manufactured by the same pharmacorp.) I took the first pill at 12:48 pm. 1:18, still nothing really - head is a little foggy if anything. later noticed a steady sort of mental energy lasting for hours (got a good deal of reading and programming done) until my midnight walk, when I still felt alert, and had trouble sleeping. (Zeo reported a ZQ of 100, but a full 18 minutes awake, 2 or 3 times the usual amount.) At this point, I began thinking about what I was doing. Black-market Adderall is fairly expensive;$4-10 a pill vs prescription prices which run more like $60 for 120 20mg pills. It would be a bad idea to become a fan without being quite sure that it is delivering bang for the buck. Now, why the piracetam mix as the placebo as opposed to my other available powder, creatine powder, which has much smaller mental effects? Because the question for me is not whether the Adderall works (I am quite sure that the amphetamines have effects!) but whether it works better for me than my cheap legal standbys (piracetam & caffeine)? (Does Adderall have marginal advantage for me?) Hence, I want to know whether Adderall is better than my piracetam mix. People frequently underestimate the power of placebo effects, so it’s worth testing. (Unfortunately, it seems that there is experimental evidence that people on Adderall know they are on Adderall and also believe they have improved performance, when they do not5. So the blind testing does not buy me as much as it could.) ## Adderall blind testing ### Blinding yourself But how to blind myself? I used my pill maker to make 9 OO pills of piracetam mix, and then 9 OO pills of piracetam mix+the Adderall, then I put them in a baggy. The idea is that I can blind myself as to what pill I am taking that day since at the end of the day, I can just look in the baggy and see whether a placebo or Adderall pill is missing: the big capsules are transparent so I can see whether there is a crushed-up blue Adderall in the end or not. If there are fewer Adderall than placebo, I took an Adderall, and vice-versa. Now, since I am checking at the end of each day, I also need to remove or add the opposite pill to maintain the ratio and make it easy to check the next day; more importantly I need to replace or remove a pill, because otherwise the odds will be skewed and I will know how they are skewed. (Imagine I started with 4 Adderalls and 4 placebos, and then 3 days in a row I draw placebos but I don’t add or remove any pills; the next day, because most of the placebos have been used up, there’s only a small chance I will get a placebo…) This is only one of many ways to blind myself; for example, instead of using one bag, one could use two bags and instead blindly pick a bag to take a pill out of, balancing contents as before. (See also my Vitamin D and day modafinil trials.) ### Results 1. Began double-blind trial. Today I took one pill blindly at 1:53 PM. at the end of the day when I have written down my impressions and guess whether it was one of the Adderall pills, then I can look in the baggy and count and see whether it was. there are many other procedures one can take to blind oneself (have an accomplice mix up a sequence of pills and record what the sequence was; don’t count & see but blindly take a photograph of the pill each day, etc.) Around 3, I begin to wonder whether it was Adderall because I am arguing more than usual on IRC and my heart rate seems a bit high just sitting down. 6 PM: I’ve started to think it was a placebo. My heart rate is back to normal, I am having difficulty concentrating on long text, and my appetite has shown up for dinner (although I didn’t have lunch, I don’t think I had lunch yesterday and yesterday the hunger didn’t show up until past 7). Productivity wise, it has been a normal day. All in all, I’m not too sure, but I think I’d guess it was Adderall with 40% confidence (another way of saying ‘placebo with 60% confidence’). When I go to examine the baggie at 8:20 PM, I find out… it was an Adderall pill after all. Oh dear. One little strike against Adderall that I guessed wrong. It may be that the problem is that I am intrinsically a little worse today (normal variation? come down from Adderall?). So, a change to the protocol. I will take a pill every other day - a day to washout and reacclimate to ‘baseline’, and then an experimental day. In subsequent entries, assume there was either a at least one intervening break or placebo day. 2. Took random pill at 2:02 PM. Went to lunch half an hour afterwards, talked until 4 - more outgoing than my usual self. I continued to be pretty energetic despite not taking my caffeine+piracetam pills, and though it’s now 12:30 AM and I listened to TAM YouTube videos all day while reading, I feel pretty energetic and am reviewing Mnemosyne cards. I am pretty confident the pill today was Adderall. Hard to believe placebo effect could do this much for this long or that normal variation would account for this. I’d say 90% confidence it was Adderall. I do some more Mnemosyne, typing practice, and reading in a Montaigne book, and finally get tired and go to bed around 1:30 AM or so. I check the baggie when I wake up the next morning, and sure enough, it had been an Adderall pill. That makes me 1 for 2. 3. Took pill 1:27 PM. At 2 my hunger gets the best of me (despite my usual tea drinking and caffeine+piracetam pills) and I eat a large lunch. This makes me suspicious it was placebo - on the previous days I had noted a considerable appetite-suppressant effect. 5:25 PM: I don’t feel unusually tired, but nothing special about my productivity. 8 PM; no longer so sure. Read and excerpted a fair bit of research I had been putting off since the morning. After putting away all the laundry at 10, still feeling active, I check. It was Adderall. I can’t claim this one either way. By 9 or 10 I had begun to wonder whether it was really Adderall, but I didn’t feel confident saying it was; my feeling could be fairly described as 50%. 4. Break; this day/night was for trying armodafinil, pill #1 5. Took pill around 6 PM; I had a very long drive to and from an airport ahead of me, ideal for Adderall. In case it was Adderall, I chewed up the pill - by making it absorb faster, more of the effect would be there when I needed it, during driving, and not lingering in my system past midnight. Was it? I didn’t notice any change in my pulse, I yawned several times on the way back, my conversation was not more voluminous than usual. I did stay up later than usual, but that’s fully explained by walking to get ice cream. All in all, my best guess was that the pill was placebo, and I feel fairly confident but not hugely confident that it was placebo. I’d give it ~70%. And checking the next morning… I was right! Finally. 6. Took pill 12:11 PM. I am not certain. While I do get some things accomplished (a fair amount of work on the Silk Road article and its submission to places), I also have some difficulty reading through a fiction book (Sum) and I seem kind of twitchy and constantly shifting windows. I am weakly inclined to think this is Adderall (say, 60%). It’s not my normal feeling. Next morning - it was Adderall. 7. Week-long break - armodafinil #2 experiment, volunteer work 8. Took pill #6 at 12:35 PM. Hard to be sure. I ultimately decided that it was Adderall because I didn’t have as much trouble as I normally would in focusing on reading and then finishing my novel (Surface Detail) despite my family watching a movie, though I didn’t notice any lack of appetite. Call this one 60-70% Adderall. I check the next evening and it was Adderall. 9. Took pill at 10:50 AM. At 12:30 I watch the new Captain America6, and come out as energetic as I went in and was not hungry for snacks at all during it; at this point, I’m pretty confident (70%) that it was Adderall. At 5 I check, and it was. Overall, pretty normal day, save for leading up to the third armodafinil trial. 10. Just 3 Adderall left; took random pill at 12:30. Hopefully I can get a lot of formatting done on hafu. I do manage to do a lot of work on it and my appetite seems minor up until 8 PM, although if not for those two observations; perhaps 60% that it was Adderall. I check the next morning, and it was not. 11. Skipping break day since it was placebo yesterday and I’d like to wind up the Adderall trials. Pill at 12:24 PM. I get very hungry around 3 PM, and it’s an unproductive day even considering how much stress and aggravation and the 3 hours a failed Debian unstable upgrade cost me. I feel quite sure (75%) it was placebo. It was. 12. Took pill at 11:27 AM. Moderately productive. Not entirely sure. 50% either way. (It’s placebo.) 13. Pill at 12:40 PM. I spend entirely too much time arguing matters related to a LW post and on IRC, but I manage to channel it into writing a new mini-essay on my past intellectual sins. This sort of thing seems like Adderall behavior, and I don’t get hungry until much later. All in all, I feel easily 75% sure it’s Adderall; and it was. 14. 12:18 PM. (There are/were just 2 Adderall left now.) I manage to spend almost the entire afternoon single-mindedly concentrating on transcribing two parts of a 1996 Toshio Okada interview (it was very long, and the formatting more challenging than expected), which is strong evidence for Adderall, although I did feel fairly hungry while doing it. I don’t go to bed until midnight and & sleep very poorly - despite taking triple my usual melatonin! Inasmuch as I’m already fairly sure that Adderall damages my sleep, this makes me even more confident (>80%). When I grumpily crawl out of bed and check: it’s Adderall. (One Adderall left.) 15. 10:50 AM. Normal appetite; I try to read through Edward Luttwak’s The Grand Strategy of the Byzantine Empire, slow going. Overall, I guess it was placebo with 70% - I notice nothing I associate with Adderall. I check it at midnight, and it was placebo. 16. 11:30 AM. By 2:30 PM, my hunger is quite strong and I don’t feel especially focused - it’s difficult to get through the tab-explosion of the morning, although one particularly stupid poster on the DNB ML makes me feel irritated like I might on Adderall. I initially figure the probability at perhaps 60% for Adderall, but when I wake up at 2 AM and am completely unable to get back to sleep, eventually racking up a Zeo score of 73 (compared to the usual 100s), there’s no doubt in my mind (95%) that the pill was Adderall. And it was the last Adderall pill indeed. My predictions were substantially better than random chance7, so my default belief - that Adderall does affect me and (mostly) for the better - is borne out. I usually sleep very well and 3 separate incidents of horrible sleep in a few weeks seems rather unlikely (though I didn’t keep track of dates carefully enough to link the Zeo data with the Adderall data). Between the price and the sleep disturbances, I don’t think Adderall is personally worthwhile. ### Value of Information (VoI) See also the discussion as applied to ordering modafinil & evaluating sleep experiments. The amphetamine mix branded “Adderall” is terribly expensive to obtain even compared to modafinil, due to its tight regulation (a lower schedule than modafinil), popularity in college as a study drug, and reportedly moves by its manufacture to exploit its privileged position as a licensed amphetamine maker to extract more consumer surplus. I paid roughly$4 a pill but could have paid up to $10. Good stimulant hygiene involves recovery periods to avoid one’s body adapting to eliminate the stimulating effects, so even if Adderall was the answer to all my woes, I would not be using it more than 2 or 3 times a week. Assuming 50 uses a year (for specific projects, let’s say, and not ordinary aimless usage), that’s a cool$200 a year. My general belief was that Adderall would be too much of a stimulant for me, as I am amphetamine-naive and Adderall has a bad reputation for letting one waste time on unimportant things. We could say my prediction was 50% that Adderall would be useful and worth investigating further. The experiment was pretty simple: blind randomized pills, 10 placebo & 10 active. I took notes on how productive I was and the next day guessed whether it was placebo or Adderall before breaking the seal and finding out. I didn’t do any formal statistics for it, much less a power calculation, so let’s try to be conservative by penalizing the information quality heavily and assume it had 25%. So $\frac{200-0}{\mathrm{ln}1.05}×0.50×0.25=512$! The experiment probably used up no more than an hour or two total.

Vaniver argues that since I start off not intending to continue Adderall, the analysis actually needs to be different:

In 3, you’re considering adding a new supplement, not stopping a supplement you already use. The “I don’t try Adderall” case has value $0, the “Adderall fails” case is worth -$40 (assuming you only bought 10 pills, and this number should be increased by your analysis time and a weighted cost for potential permanent side effects), and the “Adderall succeeds” case is worth $X-40-4099, where$X is the discounted lifetime value of the increased productivity due to Adderall, minus any discounted long-term side effect costs. If you estimate Adderall will work with p=.5, then you should try out Adderall if you estimate that $0.5×\left(X-4179\right)>0$ ~> $X>4179$. (Adderall working or not isn’t binary, and so you might be more comfortable breaking down the various “how effective Adderall is” cases when eliciting X, by coming up with different levels it could work at, their values, and then using a weighted sum to get X. This can also give you a better target with your experiment- “this needs to show a benefit of at least Y from Adderall for it to be worth the cost, and I’ve designed it so it has a reasonable chance of showing that.”)

One thing to notice is that the default case matters a lot. This asymmetry is because you switch decisions in different possible worlds - when you would take Adderall but stop you’re in the world where Adderall doesn’t work, and when you wouldn’t take Adderall but do you’re in the world where Adderall does work (in the perfect information case, at least). One of the ways you can visualize this is that you don’t penalize tests for giving you true negative information, and you reward them for giving you true positive information. (This might be worth a post by itself, and is very Litany of Gendlin.)

Either way, this example demonstrates that anything you are doing expensively is worth testing extensively.

The adrafinil/Olmifon (bought simultaneously with the hydergine from Anti-Aging Systems, now Antiaging Central) was a disappointment. Almost as expensive as actual modafinil, with the risk of liver problems, but did nothing whatsoever that I noticed. It is supposed to be subtler than modafinil, but that’s a little ridiculous.

The advantage of adrafinil is that it is legal & over-the-counter in the USA, so one removes the small legal risk of ordering & possessing modafinil without a prescription, and the retailers may be more reliable because they are not operating in a niche of dubious legality. Based on comments from others, the liver problem may have been overblown, and modafinil vendors post-2012 seem to have become more unstable, so I may give adrafinil (from another source than Antiaging Central) a shot when my modafinil/armodafinil run out.

# Aniracetam

Very expensive; I noticed minimal improvements when combined with sulbutiamine & piracetam+choline. Definitely not worthwhile for me.

# Beta-phenylethylamine (PEA)

Based on this H+ article/advertisement, I gave a PEA supplement a try. Noticed nothing. Critical commentators pointed out that PEA was notoriously degraded by the digestive system and has essentially no effect on its own8, though Neurvana’s ‘pro’ supplement claimed to avoid that. I guess it doesn’t.

Discussions of PEA mention that it’s almost useless without a MAOI to pave the way; hence, when I decided to get deprenyl and noticed that deprenyl is a MAOI, I decided to also give PEA a second chance in conjunction with deprenyl. Unfortunately, in part due to my own shenanigans, Nubrain canceled the deprenyl order and so I have 20g of PEA sitting around. Well, it’ll keep until such time as I do get a MAOI.

# Caffeine

Caffeine (Examine.com; FDA adverse events) is of course the most famous stimulant around. But consuming 200mg or more a day, I have discovered the downside: it is addictive and has a nasty withdrawal - headaches, decreased motivation, apathy, and general unhappiness. (It’s a little amusing to read academic descriptions of caffeine addiction9; if caffeine were a new drug, I wonder what Schedule it would be in and if people might be even more leery of it than modafinil.) Further, in some ways, aside from the ubiquitous placebo effect, caffeine combines a mix of weak performance benefits (Lorist & Snel 2008, Nehlig 2010) with some possible decrements, anecdotally and scientifically:

1. slows memory retrieval for unprimed memories (although it speeds retrieval for related/primed memories)
2. the usual U-curve applies to caffeine doses: eg while a small dose of caffeine in energy drinks substantially improves reaction-time in the cued go/no-go task, higher doses improve reaction-time less and are much closer to baseline (their optimal tested dose is, for my weight of 93kg, ~100mg)
3. caffeine damages sleep (necessary for memory and alertness), even 6 hours before sleep
4. very low doses (9mg) of caffeine can still have negative effects
5. did I mention that it correlates with changed estrogen levels in women?
6. in rats, it inhibits memory formation in the hippocampus and in mice, although other mice saw mental benefits with improvement to “long-term memory when tested with object recognition”

Finally, it’s not clear that caffeine results in performance gains after long-term use; homeostasis/tolerance is a concern for all stimulants, but especially for caffeine. It is plausible that all caffeine consumption does for the long-term chronic user is restore performance to baseline. (Imagine someone waking up and drinking coffee, and their performance improves - well, so would the performance of a non-addict who is also slowly waking up!) See for example, James & Rogers 2005, Sigmon et al 2009, and Rogers et al 2010. A cross-section of thousands of participants in the Cambridge brain-training study found “caffeine intake showed negligible effect sizes for mean and component scores” (participants were not told to use caffeine, but the training was recreational & difficult, so one expects some difference).

This research is in contrast to the other substances I like, such as piracetam or fish oil. I knew about withdrawal of course, but it was not so bad when I was drinking only tea. And the side-effects like jitteriness are worse on caffeine without tea; I chalk this up to the lack of theanine. (My later experiences with theanine seems to confirm this.) These negative effects mean that caffeine doesn’t satisfy the strictest definition of ‘nootropic’ (having no negative effects), but is merely a ‘cognitive enhancer’ (with both benefits & costs). One might wonder why I use caffeine anyway if I am so concerned with mental ability.

My answer is that this is not a lot of research or very good research (not nearly as good as the research on nicotine, eg.), and assuming it’s true, I don’t value long-term memory that much because LTM is something that is easily assisted or replaced (personal archives, and spaced repetition). For me, my problems tend to be more about akrasia and energy and not getting things done, so even if a stimulant comes with a little cost to long-term memory, it’s still useful for me. I’m going continue to use the caffeine. It’s not so bad in conjunction with tea, is very cheap, and I’m already addicted, so why not? Caffeine is extremely cheap, addictive, has minimal effects on health (and may be beneficial, from the various epidemiological associations with tea/coffee/chocolate & longevity), and costs extra to remove from drinks popular regardless of their caffeine content (coffee and tea again). What would be the point of carefully investigating it? Suppose there was conclusive evidence on the topic, the value of this evidence to me would be roughly $0 or since ignorance is bliss, negative money - because unless the negative effects were drastic (which current studies rule out, although tea has other issues like fluoride or metal contents), I would not change anything about my life. Why? I enjoy my tea too much. My usual tea seller doesn’t even have decaffeinated oolong in general, much less various varieties I might want to drink, apparently because de-caffeinating is so expensive it’s not worthwhile. What am I supposed to do, give up my tea and caffeine just to save on the cost of caffeine? Buy de-caffeinating machines (which I couldn’t even find any prices for, googling)? This also holds true for people who drink coffee or caffeinated soda. (As opposed to a drug like modafinil which is expensive, and so the value of a definitive answer is substantial and would justify some more extensive calculating of cost-benefit.) I ordered 400g of ‘anhydrous caffeine’ from Smart Powders. Apparently my oolong tea doesn’t contain very much caffeine, so adding a fraction of a gram wakes me up a bit. Surprisingly for something with ‘anhydrous’ in its name, it doesn’t seem to dissolve very well. I ultimately mixed it in with the 3kg of piracetam and included it in that batch of pills. I mixed it very thoroughly, one ingredient at a time, so I’m not very worried about ‘hot spots’. But if you are, one clever way to get accurate caffeine measurements is to measure out a large quantity & dissolve it since it’s easier to measure water than powder, and dissolving guarantees even distribution. This can be important because caffeine is, like nicotine, an alkaloid poison which - “the dose makes the poison” - can kill in high doses, and concentrated powder makes it easy to take too much, as one inept Englishman discovered the hard way. (This dissolving trick is applicable to anything else that dissolves nicely.) # Choline/DMAE Does little alone, but absolutely necessary in conjunction with piracetam. (Bought from Smart Powders.) When turning my 3kg of piracetam into pills, I decided to avoid the fishy-smelling choline and go with 500g of DMAE (Examine.com); it seemed to work well when I used it before with oxiracetam & piracetam, since I had no ‘piracetam headaches’, and be considerably less bulky. In the future, I might try Alpha-GPC instead of the regular cholines; that supposedly has better bio-availability. # Cocoa Chocolate or cocoa powder (Examine.com), contains the stimulants caffeine and the caffeine metabolite theobromine, so it’s not necessarily surprising if cocoa powder was a weak stimulant. It’s also a witch’s brew of chemicals such as polyphenols and flavonoids some of which have been fingered as helpful10, which all adds up to an unclear impact on health (once you control for eating a lot of sugar). Googling, you sometimes see correlational studies like “Intake of Flavonoid-Rich Wine, Tea, and Chocolate by Elderly Men and Women Is Associated with Better Cognitive Test Performance”; in this one, the correlated performance increase from eating chocolate was generally fairly modest (say, <10%), and the maximum effects were at 10g/day of what was probably milk chocolate, which generally has 10-40% chocolate liquor in it, suggesting any experiment use 1-4g. More interesting is the blind RCT experiment “Consumption of cocoa flavanols results in acute improvements in mood and cognitive performance during sustained mental effort”11, which found improvements at ~1g; the most dramatic improvement of the 4 tasks (on the “Threes correct”) saw a difference of 2 to 6 at the end of the hour of testing, while several of the other tests converged by the end or saw the controls winning (“Sevens correct”). Crews et al 2008 found no cognitive benefit, and an fMRI experiment found the change in brain oxygen levels it wanted but no improvement to reaction times. It’s not clear that there is much of an effect at all. This makes it hard to design a self-experiment - how big an effect on, say, dual n-back should I be expecting? Do I need an arduous long trial or an easy short one? This would principally determine the “value of information” too; chocolate seems like a net benefit even if it does not affect the mind, but it’s also fairly costly, especially if one likes (as I do) dark chocolate. Given the mixed research, I don’t think cocoa powder is worth investigating further as a nootropic. # Coconut oil Coconut oil was recommended by Pontus Granström on the Dual N-Back mailing list for boosting energy & mental clarity. It is fairly cheap (~$13 for 30 ounces) and tastes surprisingly good; it has a very bad reputation in some parts, but seems to be in the middle of a rehabilitation. Seth Robert’s Buttermind experiment found no mental benefits to coconut oil (and benefits to eating butter), but I wonder.

The first night I was eating some coconut oil, I did my n-backing past 11 PM; normally that damages my scores, but instead I got 66/66/75/88/77% (▁▁▂▇▃) on D4B and did not feel mentally exhausted by the end. The next day, I performed well on the Cambridge mental rotations test. An anecdote, of course, and it may be due to the vitamin D I simultaneously started. Or another day, I was slumped under apathy after a promising start to the day; a dose of fish & coconut oil, and 1 last vitamin D, and I was back to feeling chipper and optimist. Unfortunately I haven’t been testing out coconut oil & vitamin D separately, so who knows which is to thank. But still interesting.

After several weeks of regularly consuming coconut oil and using up the first jar of 15oz, I’m no longer particularly convinced it was doing anything. (I’ve found it’s pretty good for frying eggs, though.) Several days after using up the second jar, I notice no real difference in mood or energy or DNB scores.

# Coluracetam

One of the most obscure -racetams around, coluracetam (Smarter Nootropics, Ceretropic, Isochroma) acts in a different way from piracetam - piracetam apparently attacks the breakdown of acetylcholine while coluracetam instead increases how much choline can be turned into useful acetylcholine. This apparently is a unique mechanism. A crazy Longecity user, ScienceGuy ponied up $16,000 (!) for a custom synthesis of 500g; he was experimenting with 10-80mg sublingual doses (the ranges in the original anti-depressive trials) and reported a laundry list of effects (as does Isochroma): primarily that it was anxiolytic and increased work stamina. Unfortunately for my stack, he claims it combines poorly with piracetam. He offered free 2g samples for regulars to test his claims. I asked & received some. Experiment design is complicated by his lack of use of any kind of objective tests, but 3 metrics seem worthwhile: 1. dual n-back: testing his claims about concentration, increased energy & stamina, and increased alertness & lucidity. 2. daily Mnemosyne flashcard scores: testing his claim about short & medium-term memory, viz. I have personally found that with respect to the NOOTROPIC effect(s) of all the RACETAMS, whilst I have experienced improvements in concentration and working capacity / productivity, I have never experienced a noticeable ongoing improvement in memory. COLURACETAM is the only RACETAM that I have taken wherein I noticed an improvement in MEMORY, both with regards to SHORT-TERM and MEDIUM-TERM MEMORY. To put matters into perspective, the memory improvement has been mild, yet still significant; whereas I have experienced no such improvement at all with the other RACETAMS. 3. daily mood/productivity log (1-5): for the anxiolytic and working claims. (In all 3, higher = better, so a multivariate result is easily interpreted..) He recommends a 10mg dose, but sublingually. He mentions “COLURACETAM’s taste is more akin to that of PRAMIRACETAM than OXIRACETAM, in that it tastes absolutely vile” (not a surprise), so it is impossible to double-blind a sublingual administration - even if I knew of an inactive equally-vile-tasting substitute, I’m not sure I would subject myself to it. To compensate for ingesting the coluracetam, it would make sense to double the dose to 20mg (turning the 2g into <100 doses). Whether the effects persist over multiple days is not clear; I’ll assume it does not until someone says it does, since this makes things much easier. # Creatine Creatine (Examine.com) monohydrate was another early essay of mine - cheap (because it’s so popular with the bodybuilder types), and with a very good safety record. I bought some from Bulk Powders and combined it with my then-current regimen (piracetam+choline). I’m not a bodybuilder, but my interest was sparked by several studies, some showing benefits and others not - usually in subpopulations like vegetarians or old people. As I am not any of the latter, I didn’t really expect a mental benefit. As it happens, I observed nothing. What surprised me was something I had forgotten about: its physical benefits. My performance in Taekwondo classes suddenly improved - specifically, my endurance increased substantially. Before, classes had left me nearly prostrate at the end, but after, I was weary yet fairly alert and happy. (I have done Taekwondo since I was 7, and I have a pretty good sense of what is and is not normal performance for my body. This was not anything as simple as failing to notice increasing fitness or something.) This was driven home to me one day when in a flurry before class, I prepared my customary tea with piracetam, choline & creatine; by the middle of the class, I was feeling faint & tired, had to take a break, and suddenly, thunderstruck, realized that I had absentmindedly forgot to actually drink it! This made me a believer. After I ran out of creatine, I noticed the increased difficulty, and resolved to buy it again at some point; many months later, there was a Smart Powders sale so bought it in my batch order,$12 for 1000g. As before, it made Taekwondo classes a bit easier. I paid closer attention this second time around and noticed that as one would expect, it only helped with muscular fatigue and did nothing for my aerobic issues. (I hate aerobic exercise, so it’s always been a weak point.) I eventually capped it as part of a sulbutiamine-DMAE-creatine-theanine mix. This ran out 1 May 2013. In March 2014, I spent $19 for 1kg of micronized creatine monohydrate to resume creatine use and also to use it as a placebo in a honey-sleep experiment testing Seth Roberts’s claim that a few grams of honey before bedtime would improve sleep quality: my usual flour placebo being unusable because the mechanism might be through simple sugars, which flour would digest into. I did not do the experiment: it was going to be a fair amount of messy work capping the honey and creatine, and I didn’t believe Roberts’s claims for a second - my only reason to do it would be to prove the claim wrong but he’d just ignore me and no one else cares. Ryan Carey tracked creatine consumption vs some tests with ambiguous results. # Fish oil Fish oil (Examine.com, buyer’s guide) provides benefits relating to general mood (eg. inflammation & anxiety; see later on anxiety) and anti-schizophrenia; it is one of the better supplements one can take. (The known risks are a higher rate of prostate cancer and internal bleeding, but are outweighed by the cardiac benefits - assuming those benefits exist, anyway, which may not be true.) The benefits of omega acids are well-researched. It is at the top of the supplement snake oil list thanks to tons of correlations; for a review, see Luchtman & Song 2013 but some specifics include “Teenage Boys Who Eat Fish At Least Once A Week Achieve Higher Intelligence Scores”, anti-inflammatory properties (see “Fish Oil: What the Prescriber Needs to Know” on arthritis), and others - “Fish oil can head off first psychotic episodes” (study; Seth Roberts commentary), “Fish Oil May Fight Breast Cancer”, “Fatty Fish May Cut Prostate Cancer Risk” & “Walnuts slow prostate cancer”, “Benefits of omega-3 fatty acids tally up”, “Serum Phospholipid Docosahexaenonic Acid Is Associated with Cognitive Functioning during Middle Adulthood” endless anecdotes. But like any other supplement, there are some safety concerns negative studies like “Fish oil fails to hold off heart arrhythmia” or “other reports cast doubt on a protective effect against dementia” or “Fish Oil Use in Pregnancy Didn’t Make Babies Smart” (WSJ) (an early promise but one that faded a bit later) or “…Supplementation with DHA compared with placebo did not slow the rate of cognitive and functional decline in patients with mild to moderate Alzheimer disease.”. As far as anxiety goes, psychiatrist Emily Deans has an overview of why the Kiecolt-Glaser et al 2011 study is nice; she also discusses why fish oil seems like a good idea from an evolutionary perspective. There was also a weaker earlier 2005 study also using healthy young people, which showed reduced anger/anxiety/depression plus slightly faster reactions. The anti-stress/anxiolytic may be related to the possible cardiovascular benefits (Carter et al 2013). ## Experiment? I can test fish oil for mood, since the other claimed benefits like anti-schizophrenia are too hard to test. The medical student trial (Kiecolt-Glaser et al 2011) did not see changes until visit 3, after 3 weeks of supplementation. (Visit 1, 3 weeks, visit 2, supplementation started for 3 weeks, visit 3, supplementation continued 3 weeks, visit 4 etc.) There were no tests in between the test starting week 1 and starting week 3, so I can’t pin it down any further. This suggests randomizing in 2 or 3 week blocks. (For an explanation of blocking, see the footnote in the Zeo page.) The placebos can be the usual pills filled with olive oil. The Nature’s Answer fish oil is lemon-flavored; it may be worth mixing in some lemon juice. In Kiecolt-Glaser et al 2011, ‘anxiety’ was measured via the Beck Anxiety scale; the placebo mean was 1.2 on a standard deviation of 0.075, and the experimental mean was 0.93 on a standard deviation of 0.076. (These are all log-transformed covariates or something; I don’t know what that means, but if I naively plug those numbers into Cohen’s d, I get a very large effect: $\frac{1.2-0.93}{0.076}$=3.55.) ### Quasi-experiment I noticed what may have been an effect on my dual n-back scores; the difference is not large (▃▆▃▃▂▂▂▂▄▅▂▄▂▃▅▃▄ vs ▃▄▂▂▃▅▂▂▄▁▄▃▅▂▃▂▄▂▁▇▃▂▂▄▄▃▃▂▃▂▂▂▃▄▄▃▆▄▄▂▃▄▃▁▂▂▂▃▂▄▂▁▁▂▄▁▃▂▄) and appears mostly in the averages - Toomim’s quick two-sample t-test gave p=0.23, although a another analysis gives p=0.138112. One issue with this before-after quasi-experiment is that one would expect my scores to slowly rise over time and hence a fish oil after would yield a score increase - the 3.2 point difference could be attributable to that, placebo effect, or random variation etc. But an accidentally noticed effect (d=0.28) is a promising start. An experiment may be worth doing given that fish oil does cost a fair bit each year: randomized blocks permitting an fish-oil-then-placebo comparison would take care of the first issue, and then blinding (olive oil capsules versus fish oil capsules?) would take care of the placebo worry. ### Power calculation We have clear hypotheses here, so we can be a little optimistic: the fish oil will either improve mood or scores or it will do nothing; it will not worsen either. First, the large anxiety effect: pwr.t.test(d=3.55,type="paired",power=0.75,alternative="greater",sig.level=0.05) Paired t test power calculation n = 2.269155 NOTE: n is number of *pairs* Suspiciously easy. 2.25 pairs or 6 blocks? Let’s be pessimistic and use the smaller effect size estimate from my quasi-trial: pwr.t.test(d=0.28,type="paired",power=0.75,alternative="greater",sig.level=0.05) Paired t test power calculation n = 69.98612 70 pairs is 140 blocks; we can drop to 36 pairs or 72 blocks if we accept a power of 0.5/50% chance of reaching significance. (Or we could economize by hoping that the effect size is not 3.5 but maybe twice the pessimistic guess; a d=0.5 at 50% power requires only 12 pairs of 24 blocks.) 70 pairs of blocks of 2 weeks, with 2 pills a day requires $\left(70×2\right)×\left(2×7\right)×2=3920$ pills. I don’t even have that many empty pills! I have <500; 500 would supply 250 days, which would yield 18 2-week blocks which could give 9 pairs. 9 pairs would give me a power of: pwr.t.test(d=0.28,type="paired",alternative="greater",sig.level=0.05,n=9) power = 0.1908962 pwr.t.test(d=0.5,type="paired",alternative="greater",sig.level=0.05,n=9) power = 0.3927739 A 20-40% chance of detecting the effect. ### VoI For background on “value of information” calculations, see the Adderall calculation. 1. Cost of fish oil: The price is not as good as multivitamins or melatonin. The studies showing effects generally use pretty high dosages, 1-4g daily. I took 4 capsules a day for roughly 4g of omega acids. The jar of 400 is 100 days’ worth, and costs ~$17, or around 17¢ a day. The general health benefits push me over the edge of favoring its indefinite use, but looking to economize. Usually, small amounts of packaged substances are more expensive than bulk unprocessed, so I looked at fish oil fluid products; and unsurprisingly, liquid is more cost-effective than pills (but like with the powders, straight fish oil isn’t very appetizing) in lieu of membership somewhere or some other price-break. I bought 4 bottles (16 fluid ounces each) for $53.31 total (thanks to coupons & sales), and each bottle lasts around a month and a half for perhaps half a year, or ~$100 for a year’s supply. (As it turned out, the 4 bottles lasted from 4 December 2010 to 17 June 2011, or 195 days.) My next batch lasted 19 August 2011-20 February 2012, and cost $58.27. Since I needed to buy empty 00 capsules (for my lithium experiment) and a book (Stanovich 2010, for SIAI work) from Amazon, I bought 4 more bottles of 16fl oz Nature’s Answer (lemon-lime) at$48.44, which I began using 27 February 2012. So call it ~$70 a year. Most of the most solid fish oil results seem to meliorate the effects of age; in my 20s, I’m not sure they are worth the cost. But I would probably resume fish oil in my 30s or 40s when aging really becomes a concern. So the experiment at most will result in discontinuing for a decade. At$X a year, that’s a net present value of sum $map (\n -> 70 / (1 + 0.05)^n) [1..10] =$540.5.
2. Cost of experimentation:

The fish oil can be considered a free sunk cost: I would take it in the absence of an experiment. The empty pill capsules could be used for something else, so we’ll put the 500 at $5. Filling 500 capsules with fish and olive oil will be messy and take an hour. Taking them regularly can be added to my habitual morning routine for vitamin D and the lithium experiment, so that is close to free but we’ll call it an hour over the 250 days. Recording mood/productivity is also free a sunk cost as it’s necessary for the other experiments; but recording dual n-back scores is more expensive: each round is ~2 minutes and one wants >=5, so each block will cost >10 minutes, so 18 tests will be >180 minutes or >3 hours. So >5 hours. Total: $5+\left(>5×7.25\right)=>41$. 3. Priors: The power calculation indicates a 20% chance of getting useful information. My quasi-experiment has <70% chance of being right, and I preserve a general skepticism about any experiment, even one as well done as the medical student one seems to be, and give that one a <80% chance of being right; so let’s call it 70% the effect exists, or 30% it doesn’t exist (which is the case in which I save money by dropping fish oil for 10 years). 4. Value of Information Power times prior times benefit minus cost of experimentation: $\left(0.20×0.30×540\right)-41=-9$. So the VoI is negative: because my default is that fish oil works and I am taking it, weak information that it doesn’t work isn’t enough. If the power calculation were giving us 40% reliable information, then the chance of learning I should drop fish oil is improved enough to make the experiment worthwhile (going from 20% to 40% switches the value from -$9 to +$23.8). ## Flaxseed The general cost of fish oil made me interested in possible substitutes. Seth Roberts uses exclusively flaxseed oil or flaxseed meal, and this seems to work well for him with subjective effects (eg. noticing his Chinese brands seemed to not work, possibly because they were unrefrigerated and slightly rancid). It’s been studied much less than fish oil, but omega acids are confusing enough in general (is there a right ratio? McCluskey’s roundup gives the impression claims about ratios may have been overstated) that I’m not convinced ALA is a much inferior replacement for fish oil’s mixes of EPA & DHA. Flaxseed oil is, ounce for ounce, about as expensive as fish oil, and also must be refrigerated and goes bad within months anyway. Flax seeds on the other hand, do not go bad within months, and cost dollars per pound. Various resources I found online estimated that the ALA component of human-edible flaxseed to be around 20% So Amazon’s 6lbs for$14 is ~1.2lbs of ALA, compared to 16fl-oz of fish oil weighing ~1lb and costing ~$17, while also keeping better and being a calorically useful part of my diet. The flaxseeds can be ground in an ordinary food processor or coffee grinder. It’s not a hugely impressive cost-savings, but I think it’s worth trying when I run out of fish oil. After trying out 2 6lb packs between 12 September & 25 November 2012, and 20 March & 20 August 2013, I have given up on flaxseed meal. They did not seem to go bad in the refrigerator or freezer, and tasted OK, but I had difficulty working them into my usual recipes: it doesn’t combine well with hot or cold oatmeal, and when I tried using flaxseed meal in soups I learned flaxseed is a thickener which can give soup the consistency of snot. It’s easier to use fish oil on a daily basis. # Huperzine-A The chemical Huperzine-A (Examine.com) is extracted from a moss. It is an acetylcholinesterase inhibitor (instead of forcing out more acetylcholine like the -racetams, it prevents acetylcholine from breaking down). My experience report: One for the ‘null hypothesis’ files - Huperzine-A did nothing for me. Unlike piracetam or fish oil, after a full bottle (Source Naturals, 120 pills at 200μg each), I noticed no side-effects, no mental improvements of any kind, and no changes in DNB scores from straight Huperzine-A. Possible confounding factors: • youth: I am considerably younger than the other poster who uses HA • I only tested a few days with choline+H-A (but I didn’t notice anything beyond the choline there). • counterfeiting? Source Naturals is supposed to be trustworthy, but rare herbal products are most susceptible to fake goods. It’s really too bad. H-A is cheap, compact, doesn’t taste at all, and in general is much easier to take than fish oil (and much easier to swallow than piracetam or choline!). But if it doesn’t deliver, it doesn’t deliver. # Hydergine Hydergine (FDA adverse events) was another disappointment (like the adrafinil, purchased from Anti-Aging Systems/Antiaging Central). I noticed little to nothing that couldn’t be normal daily variation. # Iodine As discussed in my iodine essay (FDA adverse events), iodine is a powerful health intervention as it eliminates cretinism and improves average IQ by a shocking magnitude. If this effect were possible for non-fetuses in general, it would be the best nootropic ever discovered, and so I looked at it very closely. Unfortunately, after going through ~20 experiments looking for ones which intervened with iodine post-birth and took measures of cognitive function, my meta-analysis concludes that: the effect is small and driven mostly by one outlier study. Once you are born, it’s too late. But the results could be wrong, and iodine might be cheap enough to take anyway, or take for non-IQ reasons. (This possibility was further weakened for me by an August 2013 blood test of TSH which put me at 3.71 uIU/ml, comfortably within the reference range of 0.27-4.20.) ## Power analysis Starting from the studies in my meta-analysis, we can try to estimate an upper bound on how big any effect would be, if it actually existed. One of the most promising null results, Southon et al 1994, turns out to be not very informative: if we punch in the number of kids, we find that they needed a large effect size (d=0.81) before they could see anything: library(pwr) pwr.t.test(power=0.75, sig.level=0.05, n=22) Two-sample t test power calculation n = 22 d = 0.8130347 Fitzgerald 2012 is better, and gives a number of useful details on her adult experiment: Participants (n=205) [young adults aged 18-30 years] were recruited between July 2010 and January 2011, and were randomized to receive either a daily 150 µg (0.15mg) iodine supplement or daily placebo supplement for 32 weeks…After adjusting for baseline cognitive test score, examiner, age, sex, income, and ethnicity, iodine supplementation did not significantly predict 32 week cognitive test scores for Block Design (p=0.385), Digit Span Backward (p=0.474), Matrix Reasoning (p=0.885), Symbol Search (p=0.844), Visual Puzzles (p=0.675), Coding (p=0.858), and Letter-Number Sequencing (p=0.408). Full text isn’t available although some of the p-values suggest that there might be differences which didn’t reach significance , so to estimate an upper bound on what sort of effect-size we’re dealing with: pwr.t.test(type="two.sample",power=0.75,alternative="greater",n=102) Two-sample t test power calculation n = 102 d = 0.325867 This is a much tighter upper bound than Southon et al 1994 gave us, and also kind of discouraging: remember, the smaller the effect size, the more data you will need to see it, and data is always expensive. If I were to try to do any experiment, how many pairs would I need if we optimistically assume that d=0.32? pwr.t.test(type="paired",d=0.325867,power=0.75,alternative="greater") Paired t test power calculation n = 52.03677 We’d want 53 pairs, but Fitzgerald 2012’s experimental design called for 32 weeks of supplementation for a single pair of before-after tests - so that’d be 1664 weeks or ~54 months or ~4.5 years! We can try to adjust it downwards with shorter blocks allowing more frequent testing; but problematically, iodine is stored in the thyroid and can apparently linger elsewhere - many of the cited studies used intramuscular injections of iodized oil (as opposed to iodized salt or kelp supplements) because this ensured an adequate supply for months or years with no further compliance by the subjects. If the effects are that long-lasting, it may be worthless to try shorter blocks than ~32 weeks. We’ve looked at estimating based on individual studies. But we aggregated them into a meta-analysis more powerful than any of them, and it gave us a final estimate of d=~0.1. What does that imply? pwr.t.test(type="paired",d=0.1,power=0.75,alternative="greater") Paired t test power calculation n = 539.2906 540 pairs of tests or 1080 blocks… This game is not worth the candle! ## VoI For background on “value of information” calculations, see the Adderall calculation. 1. Cost: This would be a very time-consuming experiment. Any attempt to combine this with other experiments by ANOVA would probably push the end-date out by months, and one would start to be seriously concerned that changes caused by aging or environmental factors would contaminate the results. A 5-year experiment with 7-month intervals will probably eat up 5+ hours to prepare <12,000 pills (active & placebo); each switch and test of mental functioning will probably eat up another hour for 32 hours. (And what test maintains validity with no practice effects over 5 years? Dual n-back would be unusable because of improvements to WM over that period.) Add in an hour for analysis & writeup, that suggests >38 hours of work, and $38×7.25=275.5$. 12,000 pills is roughly$12.80 per thousand or $154; 120 potassium iodide pills is ~$9, so $\frac{365.25}{120}×9×5=137$.

The time plus the gel capsules plus the potassium iodide is $567. 2. Benefit: Some work has been done on estimating the value of IQ, both as net benefits to the possessor (including all zero-sum or negative-sum aspects) and as net positive externalities to the rest of society. The estimates are substantial: in the thousands of dollars per IQ point. But since increasing IQ post-childhood is almost impossible barring disease or similar deficits, and even increasing childhood IQs is very challenging, much of these estimates are merely correlations or regressions, and the experimental childhood estimates must be weakened considerably for any adult - since so much time and so many opportunities have been lost. A wild guess:$1000 net present value per IQ point. The range for severely deficient children was 10-15 points, so any normal (somewhat deficient) adult gain must be much smaller and consistent with Fitzgerald 2012’s ceiling on possible effect sizes (small).

Let’s make another wild guess at 2 IQ points, for $2000. 3. Expectation: What is my prior expectation that iodine will do anything? A good way to break this question down is the following series of necessary steps: • how much do I believe I am iodine deficient? (If I am not deficient, then supplementation ought to have no effect.) The previous material on modern trends suggests a prior >25%, and higher than that if I were female. However, I was raised on a low-salt diet because my father has high blood pressure, and while I like seafood, I doubt I eat it more often than weekly. I suspect I am somewhat iodine-deficient, although I don’t believe as confidently as I did that I had a vitamin D deficiency. Let’s call this one 75%. • If deficient, how likely would it help at my age? (The effect may exist only at limited age ranges - like height, once you’re done growing, few interventions short of bone surgery will make one taller or shorter.) So this is one of the key assumptions: can we extend the benefits in deficient children to somewhat deficient adults? Fitzgerald 2012 and the general absence of successful experiments suggests not, as does the general historic failure of scores of IQ-related interventions in healthy young adults. Of the 10 studies listed in the original section dealing with iodine in children or adults, only 2 show any benefit; in lieu of a meta-analysis, a rule of thumb would be 20%, but both those studies used a package of dozens of nutrients - and not just iodine - so if the responsible substance were randomly picked, that suggests we ought to give it a chance of $20$ of being iodine! I may be unduly optimistic if I give this as much as 10%. • If it would help at my age, how likely do I think my supplementation would hit the sweet spot and not under or overshoot? (We already saw that too much iodine could poison both adults and children, and of course too little does not help much - iodine would seem to follow a U-curve like most supplements.) The listed doses at iherb.com often are ridiculously large: 10-50mg! These are doses that seems to actually be dangerous for long-term consumption, and I believe these are doses that are designed to completely suffocate the thyroid gland and prevent it from absorbing any more iodine - which is useful as a short-term radioactive fallout prophylactic, but quite useless from a supplementation standpoint. Fortunately, there are available doses at Fitzgerald 2012’s exact dose, which is roughly the daily RDA: 0.15mg. Even the contrarian materials seem to focus on a modest doubling or tripling of the existing RDA, so the range seems relatively narrow. I’m fairly confident I won’t overshoot if I go with 0.15-1mg, so let’s call this 90%. Conclusion: 75% times 10% times 90% is 6.3%. 4. EV of taking iodine Now, what is the expected value (EV) of simply taking iodine, without the additional work of the experiment? 4 cans of 0.15mg x 200 is$20 for 2.1 years’ worth or ~$10 a year or a NPV cost of$205 ($\frac{10}{\mathrm{ln}1.05}$) versus a 20% chance of $2000 or$400. So the expected value is greater than the NPV cost of taking it, so I should start taking iodine.
5. Value of Information

Finally, what is the value of information of conducting the experiment?

With an estimated power of 75%, and my own skeptical prior of 20% that there’s any effect worth caring about, and a potential benefit of $2000, that’s $0.75×0.063×2000=95$. We must weigh$95 against the estimated experimentation cost of $567. Since the information is worth less than the experiment costs, I should not do it. But notice that most of the cost imbalance is coming from the estimate of the benefit of IQ - if it quadrupled to a defensible$8000, that would be close to the experiment cost! So in a way, what this VoI calculation tells us is that what is most valuable right now is not that iodine might possibly increase IQ, but getting a better grip on how much any IQ intervention is worth.

So the overall picture is that I should:

1. start taking a moderate dose of iodine at some point
2. look into cheap tests for iodine deficiency

• One self-test suggested online involves dripping iodine onto one’s skin and seeing how long it takes to be absorbed. This doesn’t seem terrible, but according to Derry and Abraham, it is unreliable.
• Home urine test kits of unknown accuracy are available online (Google “iodine urine test kit”) but run $70-$100+ eg. Hakala Research.
3. try to think of cheaper experiments I could run for benefits from iodine

## Iodine eye color changes?

A poster or two on Longecity claimed that iodine supplementation had changed their eye color, suggesting a connection to the yellow-reddish element bromine - bromides being displaced by their chemical cousin, iodine. I was skeptical this was a real effect since I don’t know why visible amounts of either iodine or bromine would be in the eye, and the photographs produced were less than convincing. But it’s an easy thing to test, so why not?

For 2 weeks, upon awakening I took close-up photographs of my right eye. Then I ordered two jars of Life-Extension Sea-Iodine (60x1mg) (1mg being an apparently safe dose), and when it arrived on 10 September 2012, I stopped the photography and began taking 1 iodine pill every other day. I noticed no ill effects (or benefits) after a few weeks and upped the dose to 1 pill daily. After the first jar of 60 pills was used up, I switched to the second jar, and began photography as before for 2 weeks. The photographs were uploaded, cropped by hand in Gimp, and shrunk to more reasonable dimensions; both sets are available in a Zip file.

Upon examining the photographs, I noticed no difference in eye color, but it seems that my move had changed the ambient lighting in the morning and so there was a clear difference between the two sets of photographs! The ‘before’ photographs had brighter lighting than the ‘after’ photographs. Regardless, I decided to run a small survey on QuickSurveys/Toluna to confirm my diagnosis of no-change; the survey was 11 forced-choice pairs of photographs (before-after), with the instructions as follows:

Estimated time: <1 min.

Below is 11 pairs of close-up eye photographs,. In half the photos, the eye color of the iris may or may not have been artificially lightened; as a challenge, the photos are taken under varying light conditions!

In each pair, try to pick the photo with a lightened iris eye color if any. (Do not judge simply on overall lighting.)

(I reasoned that this description is not actually deceptive: taking pills is indeed “artificial”, as I would not ‘naturally’ consume so much iodine or seaweed extract, and I didn’t know for sure that my eyes hadn’t changed color so the correct description is indeed “may or may not have”.)

I posted a link to the survey on my Google+ account, and inserted the link at the top of all gwern.net pages; 51 people completed all 11 binary choices (most of them coming from North America & Europe), which seems adequate since the 11 questions are all asking the same question, and 561 responses to one question is quite a few. A few different statistical tests seem applicable: a chi-squared test whether there’s a difference between all the answers, a two-sample test on the averages, and most meaningfully, summing up the responses as a single pair of numbers and doing a binomial test:

R> before <- c(27,31,18,26,22,29,20,13,18,31,27) # I split the 11 questions into how many picked,
R> after  <- c(24,20,33,25,29,22,31,38,33,20,24) # for it, before vs after
R> summary(before); summary(after)
Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
13.0    19.0    26.0    23.8    28.0    31.0
Min. 1st Qu.  Median    Mean 3rd Qu.    Max.
20.0    23.0    25.0    27.2    32.0    38.0
R>
R> chisq.test(before, after, simulate.p.value=TRUE)

Pearsons Chi-squared test with simulated p-value

data:  before and after
X-squared = 77, df = NA, p-value = 0.000135
R> wilcox.test(before, after)

Wilcoxon rank sum test with continuity correction

data:  before and after
W = 43, p-value = 0.2624
alternative hypothesis: true location shift is not equal to 0

R> binom.test(c(sum(before), sum(after)))

Exact binomial test

data:  c(sum(before), sum(after))
number of successes = 262, number of trials = 561, p-value = 0.1285
alternative hypothesis: true probability of success is not equal to 0.5
95% confidence interval:
0.4251 0.5093
sample estimates:
probability of success
0.467

So the chi-squared believes there is a statistically-significant difference, the two-sample test disagrees, and the binomial also disagrees. Since I regarded it as a dubious theory, can’t see a difference, and the binomial seems like the most appropriate test, I conclude that several months of 1mg iodine did not change my eye color. (As a final test, when I posted the results on the Longecity forum where people were claiming the eye color change, I swapped the labels on the photos to see if anyone would claim something along the lines “when I look at the photos, I can see a difference!”. I thought someone might do that, which would be a damning demonstration of their biases & wishful thinking, but no one did.)

# Kratom

Kratom (Erowid, Reddit) is a tree leaf from Southeast Asia; it’s addictive to some degree (like caffeine and nicotine), and so it is regulated/banned in Thailand, Malaysia, Myanmar, and Bhutan among others - but not the USA. (One might think that kratom’s common use there indicates how very addictive it must be, except it literally grows on trees so it can’t be too hard to get.) Kratom is not particularly well-studied (and what has been studied is not necessarily relevant - I’m not addicted to any opiates!), and it suffers the usual herbal problem of being an endlessly variable food product and not a specific chemical with the fun risks of perhaps being poisonous, but in my reading it doesn’t seem to be particularly dangerous or have serious side-effects.

A LessWronger found that it worked well for him as far as motivation and getting things done went, as did another LessWronger who sells it online (terming it “a reasonable productivity enhancer”) as did one of his customers, a pickup artist oddly enough. The former was curious whether it would work for me too and sent me Speciosa Pro’s “Starter Pack: Test Drive” (a sampler of 14 packets of powder and a cute little wooden spoon). In SE Asia, kratom’s apparently chewed, but the powders are brewed as a tea.

1. I started with the 10g of ‘Vitality Enhanced Blend’, a sort of tan dust. Used 2 little-spoonfuls (dust tastes a fair bit like green/oolong tea dust) into the tea mug and then some boiling water. A minute of steeping and… bleh. Tastes sort of musty and sour. (I see why people recommended sweetening it with honey.) The effects? While I might’ve been more motivated - I hadn’t had caffeine that day and was a tad under the weather, a feeling which seemed to go away perhaps half an hour after starting - I can’t say I experienced any nausea or very noticeable effects. (At least the flavor is no longer quite so offensive.)
2. 3 days later, I’m fairly miserable (slept poorly, had a hair-raising incident, and a big project was not received as well as I had hoped), so well before dinner (and after a nap) I brew up 2 wooden-spoons of ‘Malaysia Green’ (olive-color dust). I drank it down; tasted slightly better than the first. I was feeling better after the nap, and the kratom didn’t seem to change that.
3. The next day was somewhat similar, so at 2:40 I tried out 3 spoonfuls of ‘sm00th’ (?), a straight tan powder. Like the Malaysia Green, not so bad tasting. By the second cup, my stomach is growling a little. No particular motivation.
4. A week later: ‘Golden Sumatran’, 3 spoonfuls, a more yellowish powder. (I combined it with some tea dregs to hopefully cut the flavor a bit.) Had a paper to review that night. No (subjectively noticeable) effect on energy or productivity. I tried 4 spoonfuls at noon the next day; nothing except a little mental tension, for lack of a better word. I think that was just the harbinger of what my runny nose that day and the day before was, a head cold that laid me low during the evening.
5. 4 spoons of ‘Thai Red Vein’ at 1:30 PM; cold hasn’t gone away but the acetaminophen was making it bearable.
6. 4 spoons of ‘Enriched Thai’ (brown) at 8PM. Steeped 15 minutes, drank; no effect - I have to take a break to watch 3 Mobile Suit Gundam episodes before I even feel like working.
7. 5 spoons of ‘Enriched Sumatran’ (tannish-brown) at 3:10 PM; especially sludgy this time, the Sumatran powder must be finer than the other.
8. 4 spoons ‘Synergy’ (a “Premium Whole Leaf Blend”) at 11:20 AM; by 12:30 PM I feel quite tired and like I need to take a nap (previous night’s sleep was slightly above average, 96 ZQ).
9. 5 spoons ‘Essential Indo’ (olive green) at 1:50 PM; no apparent effect except perhaps some energy for writing (but then a vague headache).

At dose #9, I’ve decided to give up on kratom. It is possible that it is helping me in some way that careful testing (eg. dual n-back over weeks) would reveal, but I don’t have a strong belief that kratom would help me (I seem to benefit more from stimulants, and I’m not clear on how an opiate-bearer like kratom could stimulate me). So I have no reason to do careful testing. Oh well.

Hericium erinaceus (Examine.com) was recommended strongly by several on the ImmInst.org forums for its long-term benefits to learning, apparently linked to Nerve growth factor. Highly speculative stuff, and it’s unclear whether the mushroom powder I bought was the right form to take (ImmInst.org discussions seem to universally assume one is taking an alcohol or hotwater extract). It tasted nice, though, and I mixed it into my sleeping pills (which contain melatonin & tryptophan). I’ll probably never know whether the $30 for 0.5lb was well-spent or not. (I was more than a little nonplussed when the mushroom seller included a little pamphlet educating one about how papaya leaves can cure cancer, and how I’m shortening my life by decades by not eating many raw fruits & vegetables. There were some studies cited, but usually for points disconnected from any actual curing or longevity-inducing results. I also noticed that the author was a woman; which struck terror into my heart. What is it with women and alternative medicine? Women are greater consumers of alternative medicine according to one survey (by as much as 18%), just as they are greater consumers of medicine in general (in the 25-44 ages, ratio 2.26!); and my subjective impressions has been formed by things like watching my chiropractor uncle go through a few hours of almost exclusively female patients. One wonders what is at play there. The perceived masculinity of modern medicine and men’s general fear of biological issues? Perhaps a man goes to the doctor and does whatever surgery he is told; a woman gossips with her friends and listens to old wives’ tales? If so, a lot of that could be explained as social signaling or social grooming. “Try this small inconvenient thing I told you! There, now our bonds are a little stronger.”) # Lithium Lithium (review; FDA adverse events) is a pretty unusual substance and like caffeine and the amphetamines, questionably classified as a nootropic. As a metal, lithium is dangerous at many doses. It’s famously used for manic-depression and some other disorders, but the doses are large and verge on the point where ‘the cure is worse than the disease’. Most lithium research focuses on these larger doses, so one has to parse citations carefully to see whether it is telling one something useful about the low levels one might use for supplements or just reinforcing what one already knew (‘large doses are double-edged swords’). So, on the positive side: Ken Gillman, echoing the earlier criticisms of the Ohgami et al 2009 correlation by Chandra & Babu 2009, criticizes the correlations as generally invalid due to the smallness of the drinking water dose compared to the dietary doses of lithium; I disagree inasmuch as lithium doses are cumulative, Schrauzer 2002 reports an FDA estimate of daily American lithium consumption 1mg, points out that natural levels can reach as high as 0.34mg via drinking water, Dawson 1991 finds Texans’ lithium excretion to “vary inversely with rainfall, reflecting the dilution of drinking water supplies” (see also Dawson 1970), and Dawson et al 1972 directly compared lithium levels in county waters with urine lithium measurements and found a clean linear relationship as expected. These points suggest strongly that Gillman is wrong to think that consumption of bottled water or imported vegetables would swamp any contribution from drinking water - random noise cancels out, and small correlations can be detected using very large samples like state or nation level samples. (One commenter has suggested that the darkness caused by rain is what increases suicide rates, not the dilution of natural lithium in the drinking water; this seems unlikely as it would be inconsistent with the known peaking of suicide rates in spring when there is little darkness, and with the lack of correlation of life satisfaction with daily weather.) The criticisms of the trace lithium correlation seem weak to me, and even keeping in mind the meta results that the overwhelming majority of correlations disappear when experimentally tested (a 1% chance is a reasonable guess at the true a priori odds), the potential benefits seem so overwhelming that I am puzzled that, in the 42+ years since the correlation was first noted, no one has done a simple experiment of randomizing some counties and increasing their trace lithium concentrations within the normal range of natural variations in trace lithium concentrations. A quick estimate for what I mean. In Dawson et al 1972, the counties in the highest lithium category had 30% of the mental hospital admissions that the lowest lithium counties did; the USA spends something like$60b annually on mental health issues (the NYT quotes $150b government expenditure &$500b society-wide costs). If the reduction in admissions was equivalent to a reduction in the underlying disorders and expenditures scale exactly with number of disorders, then lithizing the USA would reap gains of something like $35b annually (NPV at 5%: ~$615b); however, this is only the direct expenditures, arguably the field is underfunded (reportedly, less than half the sufferers of mental illness may be treated), and of course the losses to society is far larger than that as peoples’ lives are destroyed, crime increases (with its massive negative externalities), careers abandoned, etc. At 1% prior odds and $615b total payoff, the expected value is ~$600m; a conclusive experiment ought to be trivially cheap to run (a few millions?), since it requires only supplementation of lithium at centralized water facilities, presents minimal ethical concerns due to remaining strictly within natural variation & regulatory limits (and vastly less than people voluntarily consume in bottled mineral waters), and can be analyzed using only statistics already being collected by police or health departments.

### Data

1. first pair

2. first block started and pill taken: 11 May 2012 - 19 May: 1
3. 20 May - 27: 0
4. second pair

1. first block started and pill taken: 29 May - 4 June: 1
2. second block: 5 June - 11 June: 0
5. third pair

1. first block: 12 June - 18 June: 1
2. second block: 19 June - 25 June: 0
6. fourth pair

7. first block: 26 June - 2 July: 1
8. second block: 3 July - 8 July: 0
9. fifth pair

1. first block: 13 July - 20 July: 1
2. second block: 21 July - 27 July: 0
10. sixth pair

1. first block: 28 July - 3 August: 0
2. second block: 4 August - 10 August: 1
11. seventh pair

1. first block: 11 August - 17 August: 1
2. second block: 18 August - 24 August: 0
12. eighth pair

1. first block: 25 August - 31 August: 1
2. second block: 1 September - 4 September, stopped until 24 September, finished 25 September: 0
13. I interrupted the lithium self-experiment until March 2013 in order to run the LSD microdosing self-experiment without a potential confound; ninth block pair:

1. 12 March 2013 - 18 March: 1
2. 19 March - 25 March: 0
14. tenth pair:

1. 26 March - 1 April: 0
2. 2 April - 8 April: 1
15. eleventh pair:

1. 9 April - 15 April: 0
2. 16 April - 21 April: 1
16. twelfth pair:

1. 22 April - 28 April: 1
2. 29 April - 5 May: 0
17. thirteenth pair:

1. 6 May - 12 May: 0
2. 13 May - 19 May: 1
18. fourteenth pair:

1. 20 May - 26 May: 1
2. 27 May - 2 June: 0
19. fifteenth:

1. 5 June - 11 June: 0
2. 12 June - 18 June: 1
20. sixteenth:

1. 19 June - 25 June: 0
2. 26 June - 2 July: 1
21. seventeenth:

1. 3 July - 9 July: 0
2. 10 July - 16 July: 1
22. eighteenth:

1. 17 July - 23 July: 0
2. 24 July - 28 July, 8 August - 9 August: 1
23. nineteenth:

1. 10 August - 16 August: 0
2. 17 August - 23 August: 1
24. twentieth:

1. 24 August - 30 August: 0
2. 3 September - 6 September: 1
25. twenty-first:

1. 7 September - 13 September: 1
2. 14 September - 20 September: 0
26. twenty-second:

1. 21 September - 27 September: 0
2. 28 September - 4 October: 1
27. twenty-third:

1. 5 October - 11 October: 0
2. 12 October - 18 October: 1
28. twenty-fourth:

1. 20 - 26 October: 0
2. 27 October - 2 November: 1

### Analysis

#### Preprocessing

1. lithium: hand-generated
2. MP: hand-edited into mp.csv
3. Mnemosyne daily recall scores: extracted from the database:

sqlite3 -batch ~/.local/share/mnemosyne/default.db \
"SELECT timestamp,easiness,grade FROM log WHERE event_type==9;" | \
tr "|" "," \
> gwern-mnemosyne.csv
4. DNB scores: omitted because I wound up getting tired of DNB around Nov 2012 and so have no scores for most of the experiment
5. Zeo sleep: loaded from existing export; I don’t expect any changes so I will test just the ZQ
6. arbtt: supports the necessary scripting:

arbtt-stats --logfile=/home/gwern/doc/arbtt/2012-2013.log
--output-format="csv" --for-each="day" --min-percentage=0 > 2012-2013-arbtt.csv
arbtt-stats --logfile=/home/gwern/doc/arbtt/2013-2014.log
--output-format="csv" --for-each="day" --min-percentage=0 > 2013-2014-arbtt.csv
arbtt generates cumulative time-usage for roughly a dozen overlapping tags/categories of activity of varying value. For the specific analysis, I plan to run factor analysis to extract one or two factors which seem to correlate with useful activity/work, and regress on those, instead of trying to regress on a dozen different time variables.
7. number of commits to the gwern.net source repository

cd ~/wiki/
echo "Gwern.net.patches,Date" > ~/patchlog.txt
git log --after=2012-05-11 --before=2013-11-02 --format="%ad" --date=short master | \
sort | uniq --count | tr --squeeze-repeats ' ' ',' | cut -d ',' -f 2,3 >> ~/patchlog.txt

Prep work (read in, extract relevant date range, combine into a single dataset, run factor analysis to extract some potentially useful variables):

lithium <- read.csv("lithium.csv")
lithium$Date <- as.Date(lithium$Date)
rm(lithium$X) mp <- read.csv("mp.csv") mp$Date <- as.Date(mp$Date) mnemosyne <- read.csv("gwern-mnemosyne.csv", header=FALSE, col.names =c("Timestamp", "Easiness", "Grade"), colClasses=c("integer", "numeric", "integer")) mnemosyne$Date <- as.Date(as.POSIXct(mnemosyne$Timestamp, origin = "1970-01-01", tz = "EST")) mnemosyne <- mnemosyne[mnemosyne$Date>as.Date("2012-05-11") & mnemosyne$Date<as.Date("2013-11-02"),] mnemosyne <- aggregate(mnemosyne$Grade, by=list(mnemosyne$Date), FUN=function (x) { mean(as.vector(x));}) colnames(mnemosyne) <- c("Date", "Mnemosyne.grade") zeo <- read.csv("http://www.gwern.net/docs/zeo/gwern-zeodata.csv") zeo$Sleep.Date <- as.Date(zeo$Sleep.Date, format="%m/%d/%Y") colnames(zeo)[1] <- "Date" zeo <- zeo[zeo$Date>as.Date("2012-05-11") & zeo$Date<as.Date("2013-11-02"),] zeo <- zeo[,c(1:10, 23)] zeo$Start.of.Night <- sapply(strsplit(as.character(zeo$Start.of.Night), " "), function(x) { x[[2]] }) ## convert "06:45" to 24300 interval <- function(x) { if (!is.na(x)) { if (grepl(" s",x)) as.integer(sub(" s","",x)) else { y <- unlist(strsplit(x, ":")); as.integer(y[[1]])*60 + as.integer(y[[2]]); } } else NA } zeo$Start.of.Night <- sapply(zeo$Start.of.Night, interval) ## the night 'wraps around' at ~800, so let's take 0-400 and add +800 to reconstruct 'late at night' zeo[zeo$Start.of.Night<400,]$Start.of.Night <- (zeo[zeo$Start.of.Night<400,]$Start.of.Night + 800) arbtt1 <- read.csv("2012-2013-arbtt.csv") arbtt2 <- read.csv("2013-2014-arbtt.csv") arbtt <- rbind(arbtt1, arbtt2) arbtt <- arbtt[as.Date(arbtt$Day)>=as.Date("2012-05-11") & as.Date(arbtt$Day)<=as.Date("2013-11-02"),] ## rename Day -> Date, delete Percentage arbtt <- with(arbtt, data.frame(Date=Day, Tag=Tag, Time=Time)) ## Convert time-lengths to second-counts: "0:16:40" to 1000 (seconds); "7:57:30" to 28650 (seconds) etc. ## We prefer units of seconds since arbtt has sub-minute resolution and not all categories ## will have a lot of time each day. interval <- function(x) { if (!is.na(x)) { if (grepl(" s",x)) as.integer(sub(" s","",x)) else { y <- unlist(strsplit(x, ":")); as.integer(y[[1]])*3600 + as.integer(y[[2]])*60 + as.integer(y[[3]]); } } else NA } arbtt$Time <- sapply(as.character(arbtt$Time), interval) library(reshape) arbtt <- reshape(arbtt, v.names="Time", timevar="Tag", idvar="Date", direction="wide") arbtt[is.na(arbtt)] <- 0 arbtt$Date <- as.Date(arbtt$Date) patches <- read.csv("patchlog.txt") patches$Date <- as.Date(patches$Date) ## merge all the previous data into a single data-frame: lithiumExperiment <- merge(merge(merge(merge(merge(lithium, mp), mnemosyne, all=TRUE), patches, all=TRUE), arbtt, all=TRUE), zeo, all=TRUE) ## no patches recorded for a day == 0 patches that day lithiumExperiment[is.na(lithiumExperiment$Gwern.net.patches),]$Gwern.net.patches <- 0 ## NA=I didn't do SRS that day; but that is bad and should be penalized! lithiumExperiment[is.na(lithiumExperiment$Mnemosyne.grade),]$Mnemosyne.grade <- 0 productivity <- lithiumExperiment[,c(3,5:22)] library(psych) ## for factor analysis nfactors(productivity) # VSS complexity 1 achieves a maximimum of 0.58 with 14 factors # VSS complexity 2 achieves a maximimum of 0.67 with 14 factors # The Velicer MAP achieves a minimum of 0.02 with 1 factors # Empirical BIC achieves a minimum of -304.3 with 4 factors # Sample Size adjusted BIC achieves a minimum of -97.84 with 7 factors # # Statistics by number of factors # vss1 vss2 map dof chisq prob sqresid fit RMSEA BIC SABIC complex eChisq eRMS # 1 0.16 0.00 0.016 152 1.3e+03 2.6e-190 20.4 0.16 0.122 389.4 871.9 1.0 2.1e+03 1.1e-01 # 2 0.27 0.31 0.022 134 7.8e+02 1.9e-91 16.7 0.31 0.095 -65.2 360.1 1.3 1.1e+03 7.9e-02 # 3 0.30 0.40 0.021 117 4.9e+02 5.2e-47 14.3 0.41 0.078 -247.2 124.2 1.6 7.0e+02 6.2e-02 # 4 0.39 0.47 0.024 101 2.5e+02 4.1e-14 12.1 0.50 0.052 -389.8 -69.2 1.7 3.4e+02 4.3e-02 # 5 0.39 0.51 0.028 86 1.9e+02 2.5e-10 11.2 0.54 0.049 -347.4 -74.4 1.7 2.4e+02 3.6e-02 # 6 0.41 0.53 0.034 72 1.4e+02 7.9e-06 10.3 0.57 0.041 -317.3 -88.8 1.6 1.7e+02 3.1e-02 # 7 0.44 0.54 0.041 59 8.6e+01 1.2e-02 9.6 0.60 0.030 -285.1 -97.8 1.8 1.1e+02 2.5e-02 # 8 0.40 0.52 0.050 47 1.1e+02 1.4e-07 9.9 0.59 0.053 -181.2 -32.0 2.0 2.0e+02 3.3e-02 # 9 0.48 0.57 0.063 36 4.6e+01 1.1e-01 8.3 0.66 0.024 -180.2 -65.9 1.7 6.0e+01 1.8e-02 # 10 0.51 0.62 0.079 26 1.9e+01 8.3e-01 7.2 0.70 0.000 -144.6 -62.1 1.6 1.9e+01 1.0e-02 # 11 0.52 0.62 0.098 17 1.4e+01 6.8e-01 6.7 0.72 0.000 -93.2 -39.3 1.7 1.5e+01 9.0e-03 # 12 0.52 0.61 0.124 9 1.1e+01 3.1e-01 6.7 0.72 0.020 -46.1 -17.5 1.6 1.3e+01 8.3e-03 # 13 0.48 0.61 0.163 2 4.9e+00 8.6e-02 6.3 0.74 0.053 -7.7 -1.3 1.8 6.2e+00 5.8e-03 # 14 0.58 0.67 0.210 -4 7.5e-03 NA 4.9 0.80 NA NA NA 1.8 9.0e-03 2.2e-04 # 15 0.56 0.64 0.293 -9 4.6e-06 NA 5.3 0.78 NA NA NA 2.0 6.1e-06 5.7e-06 # 16 0.53 0.62 0.465 -13 8.7e-07 NA 5.5 0.77 NA NA NA 2.1 8.6e-07 2.2e-06 # 17 0.51 0.61 0.540 -16 9.3e-12 NA 5.6 0.77 NA NA NA 2.1 1.1e-11 7.8e-09 # 18 0.51 0.61 1.000 -18 7.0e-10 NA 5.6 0.77 NA NA NA 2.1 7.8e-10 6.5e-08 # 19 0.51 0.61 NA -19 0.0e+00 NA 5.6 0.77 NA NA NA 2.1 6.2e-25 1.8e-15 # eCRMS eBIC # 1 0.112 1107.9 # 2 0.089 303.3 # 3 0.075 -31.6 # 4 0.055 -300.5 # 5 0.050 -304.3 # 6 0.047 -280.3 # 7 0.042 -257.4 # 8 0.062 -97.2 # 9 0.039 -167.1 # 10 0.026 -144.7 # 11 0.028 -92.1 # 12 0.036 -44.0 # 13 0.054 -6.4 # 14 NA NA # 15 NA NA # 16 NA NA # 17 NA NA # 18 NA NA # 19 NA NA factorization <- fa(productivity, nfactors=4); factorization # Standardized loadings (pattern matrix) based upon correlation matrix # MR3 MR1 MR2 MR4 h2 u2 com # MP 0.05 0.01 -0.02 0.34 0.1241 0.876 1.1 # Gwern.net.patches -0.04 0.01 0.01 0.48 0.2241 0.776 1.0 # Time.WWW 0.98 -0.04 -0.10 0.02 0.9778 0.022 1.0 # Time.X 0.49 0.29 0.47 -0.03 0.5801 0.420 2.6 # Time.IRC 0.35 -0.06 -0.14 0.16 0.1918 0.808 1.8 # Time.Writing 0.04 -0.01 0.04 0.69 0.4752 0.525 1.0 # Time.Stats 0.42 -0.10 0.30 0.01 0.2504 0.750 1.9 # Time.PDF -0.09 -0.05 0.98 0.00 0.9791 0.021 1.0 # Time.Music 0.10 -0.10 0.02 0.03 0.0196 0.980 2.2 # Time.Rec 0.03 0.99 -0.03 -0.02 0.9950 0.005 1.0 # Time.SRS 0.06 -0.06 0.07 0.10 0.0209 0.979 3.4 # Time.Sysadmin 0.22 0.13 -0.04 0.13 0.0953 0.905 2.4 # Time.DNB -0.04 -0.05 -0.06 0.07 0.0149 0.985 3.3 # Time.Bitcoin 0.15 -0.07 -0.07 -0.04 0.0306 0.969 2.1 # Time.Blackmarkets 0.18 -0.09 -0.08 0.02 0.0470 0.953 1.9 # Time.Programming -0.04 0.05 -0.04 0.43 0.1850 0.815 1.1 # Time.Backups -0.09 0.06 -0.01 0.04 0.0114 0.989 2.4 # Time.Umineko -0.16 0.71 -0.03 0.06 0.5000 0.500 1.1 # Time.Typing -0.03 -0.04 0.02 -0.01 0.0034 0.997 2.4 # # MR3 MR1 MR2 MR4 # SS loadings 1.67 1.64 1.33 1.08 # Proportion Var 0.09 0.09 0.07 0.06 # Cumulative Var 0.09 0.17 0.24 0.30 # Proportion Explained 0.29 0.29 0.23 0.19 # Cumulative Proportion 0.29 0.58 0.81 1.00 # # With factor correlations of # MR3 MR1 MR2 MR4 # MR3 1.00 0.12 -0.05 0.10 # MR1 0.12 1.00 0.07 -0.08 # MR2 -0.05 0.07 1.00 -0.08 # MR4 0.10 -0.08 -0.08 1.00 # # Mean item complexity = 1.8 # Test of the hypothesis that 4 factors are sufficient. # # The degrees of freedom for the null model are 171 # and the objective function was 3.08 with Chi Square of 1645 # The degrees of freedom for the model are 101 and the objective function was 0.46 # # The root mean square of the residuals (RMSR) is 0.04 # The df corrected root mean square of the residuals is 0.06 # # The harmonic number of observations is 538 with the empirical chi square 332.7 with prob < 1.6e-26 # The total number of observations was 542 with MLE Chi Square = 246 with prob < 4.1e-14 # # Tucker Lewis Index of factoring reliability = 0.832 # RMSEA index = 0.052 and the 90 % confidence intervals are 0.043 0.06 # BIC = -389.8 # Fit based upon off diagonal values = 0.88 # Measures of factor score adequacy # MR3 MR1 MR2 MR4 # Correlation of scores with factors 0.99 1.00 0.99 0.79 # Multiple R square of scores with factors 0.98 0.99 0.98 0.63 # Minimum correlation of possible factor scores 0.95 0.99 0.96 0.25 ## I interpret MR3=Internet+Stats usage; MR1=goofing off; MR2=reading/stats; MR4=writing ## I don't care about MR1, so we'll look for effects on 3/2/4: lithiumExperiment$MR3 <- predict(factorization, data=productivity)[,1]
lithiumExperiment$MR2 <- predict(factorization, data=productivity)[,3] lithiumExperiment$MR4 <- predict(factorization, data=productivity)[,4]
write.csv(lithiumExperiment, file="2012-lithium-experiment.csv", row.names=FALSE)

#### Test

lithiumExperiment <- read.csv("http://www.gwern.net/docs/lithium/2012-lithium-experiment.csv")
l1 <- lm(cbind(MP, Mnemosyne.grade, Gwern.net.patches, ZQ, MR3, MR2, MR4) ~ Lithium, data=lithiumExperiment)
summary(l1)
# Response MP :
#
# Coefficients:
#             Estimate Std. Error t value Pr(>|t|)
# (Intercept)   3.0613     0.0591    51.8   <2e-16
# Lithium      -0.0425     0.0841    -0.5     0.61
#
# Residual standard error: 0.755 on 320 degrees of freedom
#   (220 observations deleted due to missingness)
# Multiple R-squared:  0.000796,    Adjusted R-squared:  -0.00233
# F-statistic: 0.255 on 1 and 320 DF,  p-value: 0.614
#
#
#
# Coefficients:
#             Estimate Std. Error t value Pr(>|t|)
# (Intercept)    3.158      0.120   26.41   <2e-16
# Lithium       -0.141      0.170   -0.83     0.41
#
# Residual standard error: 1.53 on 320 degrees of freedom
#   (220 observations deleted due to missingness)
# Multiple R-squared:  0.00214, Adjusted R-squared:  -0.000975
# F-statistic: 0.687 on 1 and 320 DF,  p-value: 0.408
#
#
# Response Gwern.net.patches :
#
# Coefficients:
#             Estimate Std. Error t value Pr(>|t|)
# (Intercept)   3.8712     0.3271   11.83   <2e-16
# Lithium       0.0345     0.4655    0.07     0.94
#
# Residual standard error: 4.18 on 320 degrees of freedom
#   (220 observations deleted due to missingness)
# Multiple R-squared:  1.72e-05,    Adjusted R-squared:  -0.00311
# F-statistic: 0.00549 on 1 and 320 DF,  p-value: 0.941
#
#
# Response ZQ :
#
# Coefficients:
#             Estimate Std. Error t value Pr(>|t|)
# (Intercept)   91.773      1.024   89.66   <2e-16
# Lithium        0.523      1.457    0.36     0.72
#
# Residual standard error: 13.1 on 320 degrees of freedom
#   (220 observations deleted due to missingness)
# Multiple R-squared:  0.000402,    Adjusted R-squared:  -0.00272
# F-statistic: 0.129 on 1 and 320 DF,  p-value: 0.72
#
#
# Response MR3 :
#
# Coefficients:
#             Estimate Std. Error t value Pr(>|t|)
# (Intercept)  -0.0258     0.0691   -0.37     0.71
# Lithium       0.0657     0.0983    0.67     0.50
#
# Residual standard error: 0.882 on 320 degrees of freedom
#   (220 observations deleted due to missingness)
# Multiple R-squared:  0.00139, Adjusted R-squared:  -0.00173
# F-statistic: 0.447 on 1 and 320 DF,  p-value: 0.504
#
#
# Response MR2 :
#
# Coefficients:
#             Estimate Std. Error t value Pr(>|t|)
# (Intercept)   0.0187     0.0788    0.24     0.81
# Lithium       0.0435     0.1121    0.39     0.70
#
# Residual standard error: 1.01 on 320 degrees of freedom
#   (220 observations deleted due to missingness)
# Multiple R-squared:  0.00047, Adjusted R-squared:  -0.00265
# F-statistic: 0.15 on 1 and 320 DF,  p-value: 0.698
#
#
# Response MR4 :
#
# Coefficients:
#              Estimate Std. Error t value Pr(>|t|)
# (Intercept)  0.000209   0.052772    0.00     1.00
# Lithium     -0.073464   0.075099   -0.98     0.33
#
# Residual standard error: 0.674 on 320 degrees of freedom
#   (220 observations deleted due to missingness)
# Multiple R-squared:  0.00298, Adjusted R-squared:  -0.000134
# F-statistic: 0.957 on 1 and 320 DF,  p-value: 0.329

summary(manova(l1))
#            Df      Pillai  approx F num Df den Df  Pr(>F)
# Lithium     1 0.009477169 0.4291862      7    314 0.88373
# Residuals 320

No variable reaches statistical-significance, the coefficient signs are inconsistent, and the MANOVA indicates no overall improvement by using the lithium variable.

### Conclusion

There were no observable effects, either positive or beneficial, to the lithium orotate doses. This is consistent with my subjective experience. So I will not be using lithium orotate anymore.

# LLLT

Low level laser therapy (LLLT) is a curious treatment based on the application of a few minutes of weak light in specific near-infrared wavelengths (the name is a bit of a misnomer as LEDs seem to be employed more these days, due to the laser aspect being unnecessary and LEDs much cheaper). Unlike most kinds of light therapy, it doesn’t seem to have anything to do with circadian rhythms or zeitgebers. Proponents claim efficacy in treating physical injuries, back pain, and numerous other ailments, recently extending it to case studies of mental issues like brain fog. (It’s applied to injured parts; for the brain, it’s typically applied to points on the skull like F3 or F4.) And LLLT is, naturally, completely safe without any side effects or risk of injury.

To say that this all sounds dubious would be an understatement. (My first reaction was that LLLT and lostfalco’s other proposals were probably the stupidest thing I’d seen all month.)

The research literature, whilea copious, is messy and varied: methodologies and devices vary substantially, sample sizes are tiny, the study designs vary from paper to paper, metrics are sometimes comically limited (one study measured speed of finishing a RAPM IQ test but not scores), blinding is rare and unclear how successful, etc. Relevant papers include Chung et al 2012, Rojas & Gonzalez-Lima 2013, & Gonzalez-Lima & Barrett 2014. Another Longecity user ran a self-experiment, with some design advice from me, where he performed a few cognitive tests over several periods of LLLT usage (the blocks turned out to be ABBA), using his father and towels to try to blind himself as to condition. I analyzed his data, and his scores did seem to improve, but his scores improved so much in the last part of the self-experiment I found myself dubious as to what was going on - possibly a failure of randomness given too few blocks and an exogenous factor in the last quarter which was responsible for the improvement.

While the mechanism is largely unknown, one commonly mechanism possibility is that light of the relevant wavelengths is preferentially absorbed by the protein cytochrome c oxidase, which is a key protein in mitochondrial metabolism and production of ATP, substantially increasing output, and this extra output presumably can be useful for cellular activities like healing or higher performance.

I was contacted by the Longecity user lostfalco, and read through some of his writings on the topic. I had never heard of LLLT before, but the mitochondria mechanism didn’t sound impossible (although I wondered whether it made sense at a quantity level212223), and there was at least some research backing it; more importantly, lostfalco had discovered that devices for LLLT could be obtained as cheap as $15. (Clearly no one will be getting rich off LLLT or affiliate revenue any time soon.) Nor could I think of any way the LLLT could be easily harmful: there were no drugs involved, physical contact was unnecessary, power output was too low to directly damage through heating, and if it had no LLLT-style effect but some sort of circadian effect through hitting photoreceptors, using it in the morning wouldn’t seem to interfere with sleep. Since LLLT was so cheap, seemed safe, was interesting, just trying it would involve minimal effort, and it would be a favor to lostfalco, I decided to try it. I purchased off eBay a$13 “48 LED illuminator light IR Infrared Night Vision+Power Supply For CCTV. Auto Power-On Sensor, only turn-on when the surrounding is dark. IR LED wavelength: 850nm. Powered by DC 12V 500mA adaptor.” It arrived in 4 days, on 7 September 2013. It fits handily in my palm. My cellphone camera verified it worked and emitted infrared - important because there’s no visible light at all (except in complete darkness I can make out a faint red light), no noise, no apparent heat (it took about 30 minutes before the lens or body warmed up noticeably when I left it on a table). This was good since I worried that there would be heat or noise which made blinding impossible; all I had to do was figure out how to randomly turn the power on and I could run blinded self-experiments with it.

My first time was relatively short: 10 minutes around the F3/F4 points, with another 5 minutes to the forehead. Awkward holding it up against one’s head, and I see why people talk of “LED helmets”, it’s boring waiting. No initial impressions except maybe feeling a bit mentally cloudy, but that goes away within 20 minutes of finishing when I took a nap outside in the sunlight. Lostfalco says “Expectations: You will be tired after the first time for 2 to 24 hours. It’s perfectly normal.”, but I’m not sure - my dog woke me up very early and disturbed my sleep, so maybe that’s why I felt suddenly tired. On the second day, I escalated to 30 minutes on the forehead, and tried an hour on my finger joints. No particular observations except less tiredness than before and perhaps less joint ache. Third day: skipped forehead stimulation, exclusively knee & ankle. Fourth day: forehead at various spots for 30 minutes; tiredness 5/6/7/8th day (11/12/13/4): skipped. Ninth: forehead, 20 minutes. No noticeable effects.

## Pilot

At this point I began to get bored with it and the lack of apparent effects, so I began a pilot trial: I’d use the LED set for 10 minutes every few days before 2PM, record, and in a few months look for a correlation with my daily self-ratings of mood/productivity (for 2.5 years I’ve asked myself at the end of each day whether I did more, the usual, or less work done that day than average, so 2=below-average, 3=average, 4=above-average; it’s ad hoc, but in some factor analyses I’ve been playing with, it seems to load on a lot of other variables I’ve measured, so I think it’s meaningful).

On 15 March 2014, I disabled light sensor: the complete absence of subjective effects since the first sessions made me wonder if the LED device was even turning on - a little bit of ambient light seems to disable it thanks to the light sensor. So I stuffed the sensor full of putty, verified it was now always-on with the cellphone camera, and began again; this time it seemed to warm up much faster, making me wonder if all the previous sessions’ sense of warmth was simply heat from my hand holding the LEDs

In late July 2014, I was cleaning up my rooms and was tired of LLLT, so I decided to chuck the LED device. But before I did that, I might as well analyze the data.

That left me with 329 days of data. The results are that (correcting for the magnesium citrate self-experiment I was running during the time period which did not turn out too great) days on which I happened to use my LED device for LLLT were much better than regular days. Below is a graph showing the entire MP dataseries with LOESS-smoothed lines showing LLLT vs non-LLLT days:

### LLLT pilot analysis

The correlation of LLLT usage with higher MP self-rating is fairly large (r=0.19 / d=0.46) and statistically-significant (p=0.0006).

I have no particularly compelling story for why this might be a correlation and not causation. It could be placebo, but I wasn’t expecting that. It could be selection effect (days on which I bothered to use the annoying LED set are better days) but then I’d expect the off-days to be below-average and compared to the 2 years of trendline before, there doesn’t seem like much of a fall.

The R code:

lllt <- read.csv("http://www.gwern.net/docs/nootropics/2014-08-03-lllt-correlation.csv")
summary(lm(MP ~ LLLT + as.logical(Magnesium.citrate) + as.integer(Date) +
as.logical(Magnesium.citrate):as.integer(Date),
data=lllt))
# ...Coefficients:
#                                                        Estimate   Std. Error  t value   Pr(>|t|)
# (Intercept)                                         4.037702597  0.616058589  6.55409 5.0282e-10
# LLLTTRUE                                            0.330923350  0.095939634  3.44929 0.00069087
# as.logical(Magnesium.citrate)TRUE                   0.963379487  0.842463568  1.14353 0.25424378
# as.integer(Date)                                   -0.001269089  0.000880949 -1.44059 0.15132856
# as.logical(Magnesium.citrate)TRUE:as.integer(Date) -0.001765953  0.001213804 -1.45489 0.14733212

0.330923350 / sd(lllt$MP, na.rm=TRUE) # [1] 0.455278787 cor.test(lllt$MP, as.integer(lllt$LLLT)) # # Pearsons product-moment correlation # # data: lllt$MP and as.integer(lllt$LLLT) # t = 3.4043, df = 327, p-value = 0.0007458 # alternative hypothesis: true correlation is not equal to 0 # 95% confidence interval: # 0.0784517682 0.2873891665 # sample estimates: # cor # 0.185010342 ## check whether there's odd about non-LLLT days by expanding to include baseline llltImputed <- lllt llltImputed[is.na(llltImputed)] <- 0 llltImputed[llltImputed$MP == 0,]$MP <- 3 # clean up an outlier using median summary(lm(MP ~ LLLT + as.logical(Magnesium.citrate) + as.integer(Date) + as.logical(Magnesium.citrate):as.integer(Date), data=llltImputed)) # ...Coefficients: # Estimate Std. Error t value Pr(>|t|) # (Intercept) 2.959172295 0.049016571 60.37085 < 2.22e-16 # LLLT 0.336886970 0.083731179 4.02344 6.2212e-05 # as.logical(Magnesium.citrate)TRUE 2.155586397 0.619675529 3.47857 0.00052845 # as.integer(Date) 0.000181441 0.000103582 1.75166 0.08017565 # as.logical(Magnesium.citrate)TRUE:as.integer(Date) -0.003373682 0.000904342 -3.73054 0.00020314 power.t.test(power=0.8, delta=(0.336886970 / sd(lllt$MP, na.rm=TRUE)),
type="paired",
alternative="one.sided")
#
#      Paired t test power calculation
#
#               n = 30.1804294
#           delta = 0.463483435
#              sd = 1
#       sig.level = 0.05
#           power = 0.8
#     alternative = one.sided
#
# NOTE: n is number of *pairs*, sd is std.dev. of *differences* within pairs

library(ggplot2)
llltImputed$Date <- as.Date(llltImputed$Date)
ggplot(data = llltImputed, aes(x=Date, y=MP, col=as.logical(llltImputed$LLLT))) + geom_point(size=I(3)) + stat_smooth() + scale_colour_manual(values=c("gray49", "green"), name = "LLLT") So, I have started a randomized experiment; should take 2 months, given the size of the correlation. If that turns out to be successful too, I’ll have to look into methods of blinding - for example, some sort of electronic doohickey which turns on randomly half the time and which records whether it’s on somewhere one can’t see. (Then for the experiment, one hooks up the LED, turns the doohickey ‘on’, and applies directly to forehead, checking the next morning to see whether it was really on or off). #### LLLT pilot factor analysis Factor-analyzing several other personal datasets into 8 factors while omitting the previous MP variable, I find LLLT correlates with personal-productivity-related factors, but less convincingly than MP, suggesting the previous result is not quite as good as it seems. My worry about the MP variable is that, plausible or not, it does seem relatively weak against manipulation; other variables I could look at, like arbtt window-tracking of how I spend my computer time, # or size of edits to my files, or spaced repetition performance, would be harder to manipulate. If it’s all due to MP, then if I remove the MP and LLLT variables, and summarize all the other variables with factor analysis into 2 or 3 variables, then I should see no increases in them when I put LLLT back in and look for a correlation between the factors & LLLT with a multivariate regression. Preparation of data: lllt <- read.csv("~/wiki/docs/nootropics/2014-08-03-lllt-correlation.csv", colClasses=c("Date",rep("integer", 4), "logical")) lllt <- data.frame(Date=lllt$Date, LLLT=lllt$LLLT) mp <- read.csv("~/selfexperiment/mp.csv", colClasses=c("Date", "integer")) creativity <- read.csv("~/selfexperiment/dailytodo-marchjunecreativity.csv", colClasses=c("Date", "integer")) mnemosyne <- read.csv("~/selfexperiment/mnemosyne.csv", header=FALSE, col.names =c("Timestamp", "Easiness", "Grade"), colClasses=c("integer", "numeric", "integer")) mnemosyne$Timestamp <- as.POSIXct(mnemosyne$Timestamp, origin = "1970-01-01", tz = "EST") mnemosyne$Date    <- as.Date(mnemosyne$Timestamp) mnemosyne <- aggregate(Grade ~ Date, mnemosyne, mean) mnemosyne$Average.Spaced.repetition.score <- mnemosyne$Grade rm(mnemosyne$Grade)

dnb$V1 <- as.POSIXct(dnb$V1, format="%Y-%m-%d %R:%S")
dnb <- dnb[!is.na(dnb$V1),] dnb <- with(dnb, data.frame(Timestamp=V1, Nback.type=V2, Percentage=V3)) dnb$Date <- as.Date(dnb$Timestamp) dnbDaily <- aggregate(Percentage ~ Date + Nback.type, dnb, mean) arbtt1 <- read.csv("~/selfexperiment/2012-2013-arbtt.txt") arbtt2 <- read.csv("~/selfexperiment/2013-2014-arbtt.txt") arbtt <- rbind(arbtt1, arbtt2) rm(arbtt$Percentage)
interval <- function(x) { if (!is.na(x)) { if (grepl(" s",x)) as.integer(sub(" s","",x))
else { y <- unlist(strsplit(x, ":"));
as.integer(y[[1]])*3600 +
as.integer(y[[2]])*60 +
as.integer(y[[3]]);
}
}
else NA
}
arbtt$Time <- sapply(as.character(arbtt$Time), interval)
library(reshape)
arbtt <- reshape(arbtt, v.names="Time", timevar="Tag", idvar="Day", direction="wide")
arbtt$Date <- as.Date(arbtt$Day)
rm(arbtt$Day) arbtt[is.na(arbtt)] <- 0 patches <- read.csv("~/selfexperiment/patchlog-gwern.net.txt", colClasses=c("integer", "Date")) patches$Gwern.net.patches.log <- log1p(patches$Gwern.net.patches) # modified lines per day is much harder: state machine to sum lines until it hits the next date patchCount <- scan(file="~/selfexperiment/patchlog-linecount-gwern.net.txt", character(), sep = "\n") patchLines <- new.env() for (i in 1:length(patchCount)) { if (grepl("\t", patchCount[i])) { patchLines[[date]] <- patchLines[[date]] + sum(sapply(strsplit(patchCount[i], "\t"), as.integer)) } else { date <- patchCount[i] patchLines[[date]] <- 0 } } patchLines <- as.list(patchLines) patchLines <- data.frame( Date = rep(names(patchLines), lapply(patchLines, length)), Gwern.net.linecount= unlist(patchLines)) rm(row.names(patchLines)) patchLines$Date <- as.Date(patchLines$Date) patchLines$Gwern.net.linecount.log <- log1p(patchLines$Gwern.net.linecount) firstDay <- patches$Date[1]; lastDay <- patches$Date[nrow(patches)] patches <- merge(merge(patchLines, patches, all=TRUE), data.frame(Date=seq(firstDay, lastDay, by="day")), all=TRUE) # if entries are missing, they == 0 patches[is.na(patches)] <- 0 # combine all the data: llltData <- merge(merge(merge(merge(merge(lllt, mp, all=TRUE), creativity, all=TRUE), dnbDaily, all=TRUE), arbtt, all=TRUE), patches, all=TRUE) write.csv(llltData, file="2014-08-08-lllt-correlation-factoranalysis.csv", row.names=FALSE) Factor analysis. The strategy: read in the data, drop unnecessary data, impute missing variables (data is too heterogeneous and collected starting at varying intervals to be clean), estimate how many factors would fit best, factor analyze, pick the ones which look like they match best my ideas of what ‘productive’ is, extract per-day estimates, and finally regress LLLT usage on the selected factors to look for increases. lllt <- read.csv("http://www.gwern.net/docs/nootropics/2014-08-08-lllt-correlation-factoranalysis.csv") # the log transforms are more useful: rm(lllt$Date, lllt$Nback.type, lllt$Gwern.net.linecount, lllt$Gwern.net.patches) # https://stats.stackexchange.com/questions/28576/filling-nas-in-a-dataset-with-column-medians-in-r imputeColumnAsMedian <- function(x){ x[is.na(x)] <- median(x, na.rm=TRUE) #convert the item with NA to median value from the column x #display the column } llltI <- data.frame(apply(lllt, 2, imputeColumnAsMedian)) library(psych) nfactors(llltI[-c(1,2)]) # VSS complexity 1 achieves a maximimum of 0.56 with 16 factors # VSS complexity 2 achieves a maximimum of 0.66 with 16 factors # The Velicer MAP achieves a minimum of 0.01 with 1 factors # Empirical BIC achieves a minimum of -280.23 with 8 factors # Sample Size adjusted BIC achieves a minimum of -135.77 with 9 factors fa.parallel(llltI[-c(1,2)], n.iter=2000) # Parallel analysis suggests that the number of factors = 7 and the number of components = 7 ## split the difference between sample-size adjusted BIC and parallel analysis with 8: factorization <- fa(llltI[-c(1,2)], nfactors=8); factorization # Standardized loadings (pattern matrix) based upon correlation matrix # MR6 MR1 MR2 MR4 MR3 MR5 MR7 MR8 h2 u2 com # Creativity.self.rating 0.22 0.06 -0.04 0.08 -0.04 0.02 -0.05 -0.14 0.0658 0.934 2.5 # Percentage -0.05 -0.02 0.01 0.01 0.00 -0.42 0.02 0.02 0.1684 0.832 1.0 # Time.X -0.04 0.11 0.04 0.88 -0.02 0.01 0.01 0.02 0.8282 0.172 1.0 # Time.PDF 0.02 0.99 -0.02 0.04 0.02 0.00 -0.01 -0.01 0.9950 0.005 1.0 # Time.Stats -0.10 0.21 0.12 0.16 -0.04 0.04 0.12 0.25 0.2310 0.769 4.3 # Time.IRC 0.01 -0.02 0.99 0.02 0.02 0.01 0.00 -0.01 0.9950 0.005 1.0 # Time.Writing 0.01 -0.02 0.01 0.04 -0.01 -0.03 0.68 0.04 0.4720 0.528 1.0 # Time.Rec 0.20 -0.12 -0.06 0.42 0.62 -0.02 -0.07 -0.01 0.8501 0.150 2.2 # Time.Music -0.05 0.05 0.02 0.02 -0.04 0.22 0.02 0.13 0.0909 0.909 2.0 # Time.SRS -0.07 0.09 0.08 0.00 0.00 0.08 0.06 0.16 0.0702 0.930 3.6 # Time.Sysadmin 0.05 -0.09 -0.04 0.15 0.07 0.01 0.14 0.42 0.2542 0.746 1.7 # Time.Bitcoin 0.45 0.02 0.25 -0.07 -0.03 -0.09 -0.04 0.11 0.3581 0.642 1.9 # Time.Backups 0.22 0.10 -0.08 -0.19 0.12 0.13 0.02 0.27 0.1809 0.819 4.3 # Time.Blackmarkets 0.62 -0.01 0.06 -0.02 -0.09 -0.01 -0.04 0.15 0.4442 0.556 1.2 # Time.Programming 0.06 -0.01 -0.01 -0.04 0.07 0.08 0.41 -0.07 0.1790 0.821 1.3 # Time.DNB -0.01 -0.01 0.02 0.01 -0.01 0.76 -0.01 0.00 0.5800 0.420 1.0 # Time.Typing -0.04 0.05 0.02 0.01 -0.02 -0.01 0.00 -0.01 0.0054 0.995 2.9 # Time.Umineko -0.10 0.08 0.06 -0.15 0.77 -0.01 0.03 0.02 0.5082 0.492 1.2 # Gwern.net.linecount.log 0.65 0.03 0.00 -0.03 0.04 0.00 0.10 -0.13 0.4223 0.578 1.1 # Gwern.net.patches.log 0.11 0.02 -0.01 0.02 0.00 0.06 0.29 -0.06 0.1001 0.900 1.5 # # MR6 MR1 MR2 MR4 MR3 MR5 MR7 MR8 # SS loadings 1.24 1.12 1.13 1.13 1.05 0.86 0.80 0.48 # Proportion Var 0.06 0.06 0.06 0.06 0.05 0.04 0.04 0.02 # Cumulative Var 0.06 0.12 0.17 0.23 0.28 0.33 0.37 0.39 # Proportion Explained 0.16 0.14 0.14 0.14 0.13 0.11 0.10 0.06 # Cumulative Proportion 0.16 0.30 0.45 0.59 0.73 0.84 0.94 1.00 # # With factor correlations of # MR6 MR1 MR2 MR4 MR3 MR5 MR7 MR8 # MR6 1.00 -0.13 0.26 0.15 0.22 -0.09 0.03 0.16 # MR1 -0.13 1.00 -0.12 0.25 -0.05 0.06 0.12 0.11 # MR2 0.26 -0.12 1.00 0.04 -0.04 0.10 0.20 0.19 # MR4 0.15 0.25 0.04 1.00 0.32 0.01 -0.05 0.10 # MR3 0.22 -0.05 -0.04 0.32 1.00 -0.04 -0.07 0.00 # MR5 -0.09 0.06 0.10 0.01 -0.04 1.00 0.11 0.11 # MR7 0.03 0.12 0.20 -0.05 -0.07 0.11 1.00 0.20 # MR8 0.16 0.11 0.19 0.10 0.00 0.11 0.20 1.00 # # Mean item complexity = 1.9 # Test of the hypothesis that 8 factors are sufficient. # # The degrees of freedom for the null model are 190 # and the objective function was 2.46 with Chi Square of 5344.68 # The degrees of freedom for the model are 58 and the objective function was 0.07 # # The root mean square of the residuals (RMSR) is 0.02 # The df corrected root mean square of the residuals is 0.03 # # The harmonic number of observations is 2178 with the empirical chi square 190.08 with prob < 5.9e-16 # The total number of observations was 2178 with MLE Chi Square = 149.65 with prob < 4.9e-10 # # Tucker Lewis Index of factoring reliability = 0.942 # RMSEA index = 0.027 and the 90 % confidence intervals are 0.022 0.032 # BIC = -296.15 # Fit based upon off diagonal values = 0.98 # Measures of factor score adequacy # MR6 MR1 MR2 MR4 MR3 MR5 MR7 MR8 # Correlation of scores with factors 0.84 1.00 1.00 0.93 0.89 0.80 0.76 0.64 # Multiple R square of scores with factors 0.70 0.99 0.99 0.86 0.79 0.63 0.58 0.41 # Minimum correlation of possible factor scores 0.40 0.99 0.99 0.71 0.58 0.27 0.16 -0.19 The important factors seem to be: #1/MR6 (Creativity.self.rating, Time.Bitcoin, Time.Backups, Time.Blackmarkets, Gwern.net.linecount.log), #2/MR1 (Time.PDF, Time.Stats), #7/MR7 (Time.Writing, Time.Sysadmin, Time.Programming, Gwern.net.patches.log), and #8/MR8 (Time.States, Time.SRS, Time.Sysadmin, Time.Backups, Time.Blackmarkets). The rest seem to be time-wasting or reflect dual n-back/DNB usage (which is not relevant in the LLLT time period). So we want to extract and look at factors #1/2/7/8 (MR6/1/7/8): lllt$MR6 <- predict(factorization, data=llltI[-c(1,2)])[,1]
lllt$MR1 <- predict(factorization, data=llltI[-c(1,2)])[,2] lllt$MR7 <- predict(factorization, data=llltI[-c(1,2)])[,7]
lllt$MR8 <- predict(factorization, data=llltI[-c(1,2)])[,8] l <- lm(cbind(MR6, MR1, MR7, MR8) ~ LLLT, data=lllt); summary(l) # Response MR6 : # Coefficients: # Estimate Std. Error t value Pr(>|t|) # (Intercept) 1.5307773 0.0736275 20.79085 < 2e-16 # LLLTTRUE 0.1319675 0.1349040 0.97823 0.32868 # # Response MR1 : # Coefficients: # Estimate Std. Error t value Pr(>|t|) # (Intercept) -0.1675241 0.0609841 -2.74701 0.0063473 # LLLTTRUE 0.0317851 0.1117381 0.28446 0.7762378 # # Response MR7 : # Coefficients: # Estimate Std. Error t value Pr(>|t|) # (Intercept) -0.0924052 0.0709438 -1.30251 0.193658 # LLLTTRUE 0.2556655 0.1299869 1.96686 0.050045 # # Response MR8 : # Coefficients: # Estimate Std. Error t value Pr(>|t|) # (Intercept) 0.0741850 0.0687618 1.07887 0.28144 # LLLTTRUE 0.1380131 0.1259889 1.09544 0.27413 0.2556655 / sd(lllt$MR7)
# [1] 0.335510445
summary(manova(l))
#            Df     Pillai approx F num Df den Df  Pr(>F)
# LLLT        1 0.01372527 1.127218      4    324 0.34355
# Residuals 327

All of the coefficients are positive, as one would hope, and one specific factor (MR7) squeaks in at d=0.34 (p=0.05). The graph is much less impressive than the graph for just MP, suggesting that the correlation may be spread out over a lot of factors, the current dataset isn’t doing a good job of capturing the effect compared to the MP self-rating, or it really was a placebo effect:

library(ggplot2)
llltRecent$index <- 1:nrow(llltRecent) qplot(index, MR7, color=LLLT, data=llltRecent) + geom_point(size=I(3)) + stat_smooth() + scale_colour_manual(values=c("gray49", "green"), name = "LLLT") The concentration in one factor leaves me a bit dubious. We’ll see what the experiment turns up. # LSD microdosing For the full writeup of background, methodology, data, and statistical analysis, please see the LSD microdosing page. Intrigued by old scientific results & many positive anecdotes since, I experimented with “microdosing” LSD - taking doses ~10μg, far below the level at which it causes its famous effects. At this level, the anecdotes claim the usual broad spectrum of positive effects on mood, depression, ability to do work, etc. After researching the matter a bit, I discovered that as far as I could tell, since the original experiment in the 1960s, no one had ever done a blind or even a randomized self-experiment on it. The self-experiment was simple: I ordered two tabs off Silk Road, dissolved one in distilled water, put the solution in one jar & tap water in the other, and took them in pairs of 3-day blocks. The results of my pre-specified analysis on a well-powered randomized blind self-experiment: 1. Sleep: • latency: none (p=0.42) • total sleep: none (p=0.14) • number of awakenings: none (p=0.36) • morning feel: increased (p=0.02) There is an increase in “Morning Feel” from 2.6 to 2.9, d=0.42 & p=0.023; correcting for performing 7 different tests, this result is not statistically-significant (it does not survive a Bonferroni correction (since $0.0231>\frac{0.05}{7}$) nor the q-value approach to family-wise correction). 2. Mnemosyne flashcard scores: none (p=0.52) 3. Mood/productivity: none (d=-0.18; p=0.86) 4. Creativity: none (d=-0.19; p=0.87) I concluded that if anything, the LSD microdosing may done the opposite of what I wanted. # Magnesium The metal magnesium (Examine.com), like potassium (which didn’t help me), plays many biological roles and has an RDA for me of 400mg which is higher than I likely get (most people apparently get less, with 68% of American adults <RDA; and while I frequently eat oats, milk, peanut butter, and whole-wheat bread, I don’t eat many leafy greens and my tap water is very soft). The anecdotes are the usual positive effects: general benefits, life improvements, higher affect; the interesting bits are the claims that magnesium is anxiolytic and affects sleep (positively, if you don’t mind the increase in dreaming). ## L-threonate There are a variety of substances to get magnesium from. Considerable enthusiasm for the new compound magnesium l-threonate was stirred by 2 small animal rat studies finding that magnesium l-threonate was able to increase magnesium levels in the brain and improve learning/memory tasks. Animal studies mean very little, of course (see the appendix), but I thought it’d be interesting to try using l-threonate, so I bought the$30 “Life Extension Neuro-Mag Magnesium L-Threonate with Calcium and Vitamin D3 (205g)”, which according to the LEF product page works out to ~60g of “Magtein™ magnesium L-threonate” and ~4.31g elemental magnesium. (I don’t need the calcium or vitamin D3, but this was the only magnesium l-threonate on Amazon.) Experiment-wise, I’ll probably look at sleep metrics and Mnemosyne performance; I put off designing a blind self-experiment until after trying some.

The powder itself is quite bulky; the recommended dose to hit 200mg of absorbed magnesium leads to ~7g of powder (so capping will be difficult) and the container provides only 30 doses’ worth (or each dose costs $1!). It’s described as lemon-flavored, and it is, but it’s sickly-sweet unpleasant and since it’s so much powder, takes half a glass of water to dissolve it entirely and wash it down. Subjectively, I notice nothing after taking it for a week. I may try a simple A-B-A analysis of sleep or Mnemosyne, but I’m not optimistic. And given the large expense of LEF’s “Magtein”, it’s probably a non-starter even if there seems to be an effect. For sleep effects, I will have to look at more reasonably priced magnesium sources. One thing I did do was piggyback on my Noopept self-experiment: I blinded & randomized the Noopept for a real experiment, but simply made sure to vary the Magtein without worrying about blinding or randomizing it. (The powder is quite bulky.) The correlation the experiment turned in was a odds-ratio of 1.9; interesting and in the right direction (higher is better), but since the magnesium part wasn’t random or blind, not a causal result. ## Citrate Encouraged by TruBrain’s magnesium & my magnesium l-threonate use, I design and run a blind random self-experiment to see whether magnesium citrate supplementation would improve my mood or productivity. I collected ~200 days of data at two dose levels. The analysis finds that the net effect was negative, but a more detailed look shows time-varying effects with a large initial benefit negated by an increasingly-negative effect. Combined with my expectations, the long half-life, and the higher-than-intended dosage, I infer that I overdosed on the magnesium. To verify this, I will be running a followup experiment with a much smaller dose. The original magnesium l-threonate caused me no apparent problems by the time I finished off the powder and usage correlated with better days, further supporting the hypothesis that magnesium helps it. But l-threonate would be difficult to cap (and hence blind self-experiment) and is ruinously expensive on a per-dose basis. So I looked around for alternatives for the followup; one of the most common compounds suggested was the citrate form because it is reasonably well-absorbed and causes fewer digestive problems, so I could just take that. Magnesium oxide is widely available it looks cheap, but the absorption/bioavailabilty problem makes it unattractive: at a 3:5 ratio, an estimate of 4% absorption, a ZMA formulation of an impressive-sounding 500mg would be $500×\frac{3}{5}×0.04=12$mg or a small fraction of RDAs for male adults like 400mg elemental. (Calcium shouldn’t be a problem since I get 220mg of calcium from my multivitamin and I enjoy dairy products daily.) Finding a usable product on Amazon caused me some difficulties. I wanted a 500mg magnesium-citrate-only product at <$20 for 120 doses, but I discovered most of the selection for “magnesium citrate” had sub-500mg doses, involved calcium citrate or other substances like zinc (not necessarily a bad thing, but would confound an experiment), were mostly magnesium oxide rather than citrate, or some still other problem. Ultimately I settled on Solgar’s $13 120x400mg magnesium citrate as acceptable. (To compare with the bulkiness of the LEF vitamin D+l-threonate powder, the Office of Dietary Supplements says magnesium citrate is 16% magnesium, so to get 400mg of magnesium as claimed, would take 2.5g of material, rather than 7g for 200mg; even if l-threonate is absorbed 100% and citrate 50%, the citrate is ahead. The pills turn out to be wider and longer than my 00 pills; if I want to get them into my gel capsules, I have to crush them into fine powder. The powder from one pill turns out to take up 2 00 pills.) My impression after the first two days (2 doses of 400mg each, one with breakfast & then lunch) was positive. I did not have the rumored digestion problems, and the first day went excellently: I was up until 1:30AM working and even then didn’t feel like going to bed - and I probably should have since I then slept abominably, which made the second day merely a good day. The third day I took none and it was an ordinary day. This is consistent with what I expected from the LEF l-threonate & TruBrain glycinate/lycinate, and so it is worth investigating with a self-experiment. ### Experiment The basic idea is to remedy a deficiency (not look for acute stimulant effects) and magnesium has a slow excretion rate24, so week-long blocks seem appropriate. I can reuse the same methodology as the lithium self-experiment. The response variables will be the usual mood/productivity self-rating and, since I was originally interested in magnesium for possible sleep quality improvements, a standardized score of sleep latency + # of awakenings + time spent awake (the same variable as my potassium sleep experiment). Since each 400mg pill takes up 2 00 pills, that’s 4 gel caps a day to reach 800mg magnesium citrate (ie. 136mg elemental magnesium), or 224 gel caps (2x120) for the first batch of Solgar magnesium pills. Turning the Solgar tablets into gel capsules was difficult enough that I switched to NOW Food’s 227g magnesium citrate powder for the second batch. #### Power Reusing the magnesium correlation from the first Noopept self-experiment and using the t-test as an approximation R> pwr.t.test(d = (0.27 / sd(npt$MP)), power = 0.8, type="paired", alternative="greater")

Paired t test power calculation

n = 50.61

50 pairs of active/placebos or 100 days. With 120 tablets and 4 tablets used up, that leaves me 58 doses. That might seem adequate except the paired t-test approximation is overly-optimistic, and I also expect the non-randomized non-blinded correlation is too high which means that is overly-optimistic as well. The power would be lower than I’d prefer. I decided to simply order another bottle of Solgar’s & double the sample size to be safe.

Is 200 enough? There are no canned power functions for the ordinal logistic regression I would be using, so the standard advice is to estimate power by simulation: generating thousands of new datasets where we know by construction that the binary magnesium variable increases MP by 0.27 (such as by bootstrapping the original Noopept experiment’s data), and seeing how often in this collection the cutoff of statistical-significance is passed when the usual analysis is done (background: CrossValidated or “Power Analysis and Sample Size Estimation using Bootstrap”). In this case, we leave alpha at 0.05, reuse the Noopept experiment’s data with its Magtein correlation, and ask for the power when n=200

library(boot)
library(rms)
n <- 200
magteinPower <- function(dt, indices) {
d <- dt[sample(nrow(dt), n, replace=TRUE), ] # new dataset, possibly larger than the original
lmodel <- lrm(MP ~ Noopept + Magtein, data = d)
return(anova(lmodel)[8])
}
bs <- boot(data=npt, statistic=magteinPower, R=100000, parallel="multicore", ncpus=4)
alpha <- 0.05
print(sum(bs$t<=alpha)/length(bs$t))
# [1] 0.7132

So the power will be ~71%.

#### Data

1. 27 August - 2 September: 0

3 September - 9 September: 1
2. 10 September - 15 September: 0

16 September - 21 September: 1
3. 22 September - 28 September: 0

29 September - 5 October: 1
4. 6 October - 12 October: 0

13 October - 19 October: 1 5. 21 October - 27 October: 1

28 October - 2 November: 0
1. 5 November - 11 November: 1 (skipped 3/4 November)

During 11 November, I accidentally unblinded myself while cleaning my room. Hence, I refilled the active jar and began a fresh pair of blocks.
2. 12 - 17 November: 0

18 - 24 November: 1
3. 25 - 29 November: 0; on 30 November, I again unblinded myself and started over later.
4. 2 - 8 December: 1

9 - 15 December: 0
5. 16 - 17 December: 0

18 - 19 December: 1

At this point, I discovered I had run out of magnesium pills and had forgotten to order the magnesium citrate powder I’d intended to. I still had a lot of Noopept pills for the concurrently running second Noopept self-experiment, but since I wanted to wrap up some other experiments with a big analysis at the end of the year, I decided to halt and resume in January 2014.
6. 25 - 31 January 2014: 0

1 February - 7 February: 1

For this batch, I tried out “NOW Foods Magnesium Citrate Powder” ($7 for 227g); the powder was still a bit sticky but much easier to work with than the Solgar pills, and the 227g made 249 gel capsule pills. The package estimates 119 serving of 315mg elemental magnesium, so a ratio of 0.315g magnesium for 1.9g magnesium citrate, implying that each gel cap pill then contains 0.152g magnesium ($\frac{\left(119×315\right)}{249}=150$) and since I want a total dose of 0.8g, I need 5 of the gel cap pills a day or 35 per block. 7. 9 - 15 February: 1 (skipped 8 February) 16 - 22 February: 0 8. 23 - 1 March: 1 2 - 8 March: 0 9. 9 - 15 March: 1 16 - 22 March: 0 10. 23 - 29 March: 0 30 March - 5 April: 1 11. 6 - 12 April: 0 13 - 19 April: 1 12. 20 - 26 April: 0 27 April - 3 May: 1 Subjectively, I have no particular comments, other than that (like the threonate), I noticed no diarrhea. #### Analysis Some prep: magnesium <- read.csv("magnesium.csv") mp <- read.csv("~/selfexperiment/mp.csv") mp$MP <- as.integer(as.character(mp$MP)) rm(magnesium$MP)
magnesium <- merge(mp, magnesium, all=TRUE)
write.csv(magnesium, file="magnesium.csv", row.names=FALSE)

The basic question: did the magnesium citrate increase MP?

magnesium <- read.csv("http://www.gwern.net/docs/nootropics/2013-2014-magnesium.csv")
summary(lm(MP ~ Magnesium.citrate, data=magnesium))
# Coefficients:
#                    Estimate Std. Error t value Pr(>|t|)
# (Intercept)        3.276515   0.056677   57.81   <2e-16
# Magnesium.citrate -0.000543   0.000144   -3.79    2e-04
#
# Residual standard error: 0.671 on 206 degrees of freedom
#   (678 observations deleted due to missingness)
# Multiple R-squared:  0.065,   Adjusted R-squared:  0.0605
# F-statistic: 14.3 on 1 and 206 DF,  p-value: 0.000201
mean(-0.000543 * c(136, 800))
# [1] -0.2541

The initial results are a shock: the mean effect of the magnesium citrate comes in at almost the exact same magnitude (-0.25) as had been estimated for the Magtein back in the original Noopept analysis (0.26), except the estimated average effect is negative, as in, the magnesium citrate was harmful, and statistically-significantly so. Huh?

This was so unexpected that I wondered if I had somehow accidentally put the magnesium pills into the placebo pill baggie or had swapped values while typing up the data into a spreadsheet, and checked into that. The spreadsheet accorded with the log above, which rules out data entry mistakes; and looking over the log, I discovered that some earlier slip-ups were able to rule out the pill-swap: I had carelessly put in some placebo pills made using rice, in order to get rid of them, and that led to me being unblinded twice before I became irritated enough to pick them all out of the bag of placebos - but how could that happen if I had swapped the groups of pills?

So I began looking further into the data to see just what had happened (perhaps horrendous bad luck on a few days), and turned to a plot:

library(ggplot2)
magnesium$Date <- as.Date(magnesium$Date)
with(magnesium[559:nrow(magnesium),],
qplot(Date, MP, color=as.factor(Magnesium.citrate), legend="Magnesium citrate", size=I(7)) +
scale_colour_manual(values=c("gray49", "red1", "red3"), name = "Magnesium"))

One thing I notice looking at the data is that the red magnesium-free days seem to dominate the upper ranks towards the end, and blues appear mostly at the bottom, although this is a little hard to see because good days in general start to become sparse towards the end. Now, why would days start to be worse towards the end, and magnesium-dose days in particular? The grim surmise is: an accumulating overdose - no immediate acute effect, but the magnesium builds up, dragging down all days, but especially magnesium-dose days. The generally recognized symptoms of hypermagnesemia don’t include effect on mood or cognition, aside from “muscle weakness, confusion, and decreased reflexes…poor appetite that does not improve”, but it seems plausible that below medically-recognizable levels of distress like hypermagnesemia might still cause mental changes, and I wouldn’t expect any psychological research to have been done on this topic.

A picture is worth a thousand words, particularly in this case where there seems to be temporal effects, different trends for the conditions, and general confusion. So, I drag up 2.5 years of MP data (for context), plot all the data, color by magnesium/non-magnesium, and fit different LOESS lines to each as a sort of smoothed average (since categorical data is hard to interpret as a bunch of dots), which yields:

magnesium[is.na(magnesium$Magnesium.citrate),]$Magnesium.citrate <- -1
ggplot(data = magnesium, aes(x=Date, y=MP, col=as.factor(magnesium$Magnesium.citrate))) + geom_point(size=I(4)) + stat_smooth() + scale_colour_manual(values=c("gray49", "grey35", "red1", "red2" ), name = "Magnesium") That really says it all: there’s an initial spike in MP, which reads like the promised stimulative effects possibly due to fixing a deficiency (a spike which doesn’t seem to have any counterparts in the previous history of MP), followed by a drastic plunge in the magnesium days but not so much the control days (indicating an acute effect when overloaded with magnesium), a partial recovery during the non-experimental Christmas break, another plunge, and finally recovery after the experiment has ended. We can verify the negative correlation with the date & an interaction between magnesium and the date; I don’t know whether to treat the magnesium dose as a linear, categorical, or logical, so I’ll try all of them: magnesium <- read.csv("/home/gwern/wiki/docs/nootropics/2013-2014-magnesium.csv") magnesium$Date <- as.integer(magnesium$Date) slm <- step(lm(MP ~ Magnesium.citrate * as.logical(Magnesium.citrate) * as.factor(Magnesium.citrate) * Date * Noopept, data=magnesium)) summary(slm) # Coefficients: # Estimate Std. Error t value Pr(>|t|) # (Intercept) 3.942875 0.571166 6.90 6.3e-11 # as.logical(Magnesium.citrate)TRUE 1.217860 0.806212 1.51 0.132 # Date -0.000992 0.000830 -1.20 0.233 # as.logical(Magnesium.citrate)TRUE:Date -0.002105 0.001173 -1.79 0.074 # # Residual standard error: 0.664 on 204 degrees of freedom # (678 observations deleted due to missingness) # Multiple R-squared: 0.0933, Adjusted R-squared: 0.08 # F-statistic: 7 on 3 and 204 DF, p-value: 0.000167 As feared and consistent with the accumulating overdose hypothesis, scores decrease over time and they decrease if magnesium is used that day. (The interaction isn’t statistically-significant, but I am not surprised: I powered this self-experiment to detect one main effect, not two main effects and an interaction.) But at least initially, the magnesium seemed to be remarkably useful. The crossover point, using this linear model, would have been somewhere around 20 days of the early small magnesium doses: # Extract estimated MP for continuous small magnesium dosing, then for no magnesium dosing; # compare them pair-wise to see which is bigger, and count how many days favor magnesium dosing. with(magnesium[!is.na(magnesium$Magnesium.citrate),], sum(predict(slm, newdata=data.frame(Date=Date, Magnesium.citrate=136)) >
predict(slm, newdata=data.frame(Date=Date, Magnesium.citrate=0))))
[1] 20

The final question is: since I was taking an overdose, how did I mess up? I thought I was making sure I got at least the right RDA of elemental magnesium by aiming for 800mg of elemental magnesium and carefully converting from raw powder weight. So I went back to the original references, and scrutinizing them closely, they really were talking about elemental magnesium and indicating I should be getting 400mg elemental a day, but I did notice something: I got the dose wrong for the Solgar pills, it wasn’t 800mg elemental, it was 800mg of citrate - I misread the label. So I went from taking ~130mg of elemental magnesium in the first period to ~800mg in the second; I don’t think it is an accident that the second period seems to have been much worse (between the plot and the time trend).

##### Sleep

I reused the magnesium data with my Zeo data and looked at the effects. The result were ambiguous: only a few effects survive multiple correction, which were a mix of good and bad ones, and I would guess that some of the bad effects are due to too much magnesium (although there is no time trend as blatant).

#### Conclusion

The interpretation which seems to best resolve everything I know about magnesium with the data from my experiment is that magnesium supplementation does indeed help me a large amount, but I was taking way too much.

This is not 100% clear from the data and just blindly using a plausible amount carries the risk of the negative effects, so I intend to run another large experiment. I will reuse the NOW powder, but this time, I will use longer blocks (to make cumulative overdosing more evident) and try to avoid any doses >150mg of elemental magnesium.

# Melatonin

See Melatonin for information on effects & cost; I regularly use melatonin to sleep, and investigating with my Zeo, it does seem to improve & shorten my sleep.

# Modafinil

See Modafinil for background on performance improvements and side-effects; the following sections are about my usage.

## SpierX

Here are the notes I jotted down while trying out modafinil back in November 2009. I didn’t make any effort to write sensibly, so this makes my lucidity seem much worse than it actually was:

Thursday: 3g piracetam/4g choline bitartrate at 1; 1 200mg modafinil at 2:20; noticed a ‘leveling’ of fatigue by 3:30; dry eyes? no bad after taste or anything. a little light-headed by 4:30, but mentally clear and focused. wonder if light-headedness is due simply to missing lunch and not modafinil. 5:43: noticed my foot jiggling - doesn’t usually jiggle while in piracetam/choline. 7:30: starting feeling a bit jittery & manic - not much or to a problematic level but definitely noticeable; but then, that often happens when I miss lunch & dinner. 12:30: bedtime. Can’t sleep even with 3mg of melatonin! Subjectively, I toss & turn (in part thanks to my cat) until 4:30, when I really wake up. I hang around bed for another hour & then give up & get up. After a shower, I feel fairly normal, strangely, though not as good as if I had truly slept 8 hours. The lesson here is to pay attention to wikipedia when it says the half-life is 12-15 hours! About 6AM I take 200mg; all the way up to 2pm I feel increasingly less energetic and unfocused, though when I do apply myself I think as well as ever. Not fixed by food or tea or piracetam/choline. I want to be up until midnight, so I take half a pill of 100mg and chew it (since I’m not planning on staying up all night and I want it to work relatively soon). From 4-12PM, I notice that today as well my heart rate is elevated; I measure it a few times and it seems to average to ~70BPM, which is higher than normal, but not high enough to concern me. I stay up to midnight fine, take 3mg of melatonin at 12:30, and have no trouble sleeping; I think I fall asleep around 1. Alarm goes off at 6, I get up at 7:15 and take the other 100mg. Only 100mg/half-a-pill because I don’t want to leave the half laying around in the open, and I’m curious whether 100mg + ~5 hours of sleep will be enough after the last 2 days. Maybe next weekend I’ll just go without sleep entirely to see what my limits are.

In general, I feel a little bit less alert, but still close to normal. By 6PM, I have a mild headache, but I try out 30 rounds of gbrainy (haven’t played it in months) and am surprised to find that I reach an all-time high; no idea whether this is due to DNB or not, since Gbrainy is very heavily ‘crystallized’ (half the challenge disappears as you learn how the problems work), but it does indicate I’m not deluding myself about mental ability. (To give a figure: my last score well before I did any DNB was 64, and I was doing well that day; on modafinil, I had a 77.) I figure the headache might be food related, eat, and by 7:30 the headache is pretty much gone and I’m fine up to midnight.

I took 1.5mg of melatonin, and went to bed at ~1:30AM; I woke up around 6:30, took a modafinil pill/200mg, and felt pretty reasonable. By noon my mind started to feel a bit fuzzy, and lunch didn’t make much of it go away. I’ve been looking at studies, and users seem to degrade after 30 hours; I started on mid-Thursday, so call that 10 hours, then 24 (Friday), 24 (Saturday), and 14 (Sunday), totaling 72hrs with <20hrs sleep; this might be equivalent to 52hrs with no sleep, and Wikipedia writes:

One study of helicopter pilots suggested that 600 mg of modafinil given in three doses can be used to keep pilots alert and maintain their accuracy at pre-deprivation levels for 40 hours without sleep.[60] However, significant levels of nausea and vertigo were observed. Another study of fighter pilots showed that modafinil given in three divided 100 mg doses sustained the flight control accuracy of sleep-deprived F-117 pilots to within about 27% of baseline levels for 37 hours, without any considerable side effects.[61] In an 88-hour sleep loss study of simulated military grounds operations, 400 mg/day doses were mildly helpful at maintaining alertness and performance of subjects compared to placebo, but the researchers concluded that this dose was not high enough to compensate for most of the effects of complete sleep loss.

### Nuvigil

1. First use

Took full pill at 10:21 PM when I started feeling a bit tired. Around 11:30, I noticed my head feeling fuzzy but my reading seemed to still be up to snuff. I would eventually finish the science book around 9 AM the next day, taking some very long breaks to walk the dog, write some poems, write a program, do Mnemosyne review (memory performance: subjectively below average, but not as bad as I would have expected from staying up all night), and some other things. Around 4 AM, I reflected that I felt much as I had during my nightwatch job at the same hour of the day - except I had switched sleep schedules for the job. The tiredness continued to build and my willpower weakened so the morning wasn’t as productive as it could have been - but my actual performance when I could be bothered was still pretty normal. That struck me as kind of interesting that I can feel very tired and not act tired, in line with the anecdotes.

Past noon, I began to feel better, but since I would be driving to errands around 4 PM, I decided to not risk it and take an hour-long nap, which went well, as did the driving. The evening was normal enough that I forgot I had stayed up the previous night, and indeed, I didn’t much feel like going to bed until past midnight. I then slept well, the Zeo giving me a 108 ZQ (not an all-time record, but still unusual).
2. I had intended to run another Adderall trial this day but then I learned we would be going to the midnight showing of the last Harry Potter movie. A perfect opportunity: going to bed at 3 AM after a stimulating battle movie would mean crappy sleep, so why not just do another armodafinil trial and kill 2 birds with one stone?

I took the pill at 11 PM the evening of (technically, the day before); that day was a little low on sleep than usual, since I had woken up an hour or half-hour early. I didn’t yawn at all during the movie (merely mediocre to my eyes with some questionable parts)29. It worked much the same as it did the previous time - as I walked around at 5 AM or so, I felt perfectly alert. I made good use of the hours and wrote up my memories of ICON 2011.

(As I was doing this, I reflected how modafinil is such a pure example of the money-time tradeoff. It’s not that you pay someone else to do something for you, which necessarily they will do in a way different from you; nor is it that you have exchanged money to free yourself of a burden of some future time-investment; nor have you paid money for a speculative return of time later in life like with many medical expenses or supplements. Rather, you have paid for 8 hours today of your own time.)

And as before, around 9 AM I began to feel the peculiar feeling that I was mentally able and apathetic (in a sort of aboulia way); so I decided to try what helped last time, a short nap. But this time, though I took a full hour, I slept not a wink and my Zeo recorded only 2 transient episodes of light sleep! A back-handed sort of proof of alertness, I suppose. I didn’t bother trying again. The rest of the day was mediocre, and I wound up spending much of it on chores and whatnot out of my control. Mentally, I felt better past 3 PM.

This continued up to 1 AM, at which point I decided not to take a second armodafinil (why spend a second pill to gain what would likely be an unproductive set of 8 hours?) and finish up the experiment with some n-backing. My 5 rounds: 60/38/62/44/5030. This was surprising. Compare those scores with scores from several previous days: 39/42/44/40/20/28/36. I had estimated before the n-backing that my scores would be in the low-end of my usual performance (20-30%) since I had not slept for the past 41 hours, and instead, the lowest score was 38%. If one did not know the context, one might think I had discovered a good nootropic! Interesting evidence that armodafinil preserves at least one kind of mental performance.
3. I stayed up late writing some poems and about how Folding@home kills, and decided to make a night of it. I took the armodafinil at 1 AM; the interesting bit is that this was the morning/evening after what turned out to be an Adderall (as opposed to placebo) trial, so perhaps I will see how well or ill they go together. A set of normal scores from a previous day was 32%/43%/51%/48%. At 11 PM, I scored 39% on DNB; at 1 AM, I scored 50%/43%; 5:15 AM, 39%/37%; 4:10 PM, 42%/40%; 11 PM, 55%/21%/38%. (▂▄▆▅ vs ▃▅▄▃▃▄▃▇▁▃)

The peculiar tired-sharp feeling was there as usual, and the DNB scores continue to suggest this is not an illusion, as they remain in the same 30-50% band as my normal performance. I did not notice the previous ‘aboulia’ feeling; instead, around noon, I was filled with a nervous energy and a disturbingly rapid pulse which meditation & deep breathing did little to help with, and which didn’t go away for an hour or so. Fortunately, this was primarily at church, so while I felt irritable, I didn’t actually interact with anyone or snap at them, and was able to keep a lid on it. I have no idea what that was about. I wondered if it might’ve been a serotonin storm since amphetamines are some of the drugs that can trigger storms but the Adderall had been at 10:50 AM the previous day, or >25 hours (the half-lives of the ingredients being around 13 hours). An hour or two previously I had taken my usual caffeine-piracetam pill with my morning tea - could that have interacted with the armodafinil and the residual Adderall? Or was it caffeine+modafinil? Speculation, perhaps. A house-mate was ill for a few hours the previous day, so maybe the truth is as prosaic as me catching whatever he had.
4. Stayed up with the purpose of finishing my work for a contest. This time, instead of taking the pill as a single large dose (I feel that after 3 times, I understand what it’s like), I will take 4 doses over the new day. I took the first quarter at 1 AM, when I was starting to feel a little foggy but not majorly impaired. Second dose, 5:30 AM; feeling a little impaired. 8:20 AM, third dose; as usual, I feel physically a bit off and mentally tired - but still mentally sharp when I actually do something. Early on, my heart rate seemed a bit high and my limbs trembling, but it’s pretty clear now that that was the caffeine or piracetam. It may be that the other day, it was the caffeine’s fault as I suspected. The final dose was around noon. The afternoon ‘crash’ wasn’t so pronounced this time, although motivation remains a problem. I put everything into finishing up the spaced repetition literature review, and didn’t do any n-backing until 11:30 PM: 32/34/31/54/40%.
5. With the last pill, I wound up trying split-doses on non-full nights; that is, if one full pill keeps me awake one full night, what does 1/4th the pill do?

1. Between midnight and 1:36 AM, I do four rounds of n-back: 50/39/30/55%. I then take 1/4th of the pill and have some tea. At roughly 1:30 AM, AngryParsley linked a SF anthology/novel, Fine Structure, which sucked me in for the next 3-4 hours until I finally finished the whole thing. At 5:20 AM, circumstances forced me to go to bed, still having only taken 1/4th of the pill and that determines this particular experiment of sleep; I quickly do some n-back: 29/20/20/54/42. I fall asleep in 13 minutes and sleep for 2:48, for a ZQ of 28 (a full night being ~100). I did not notice anything from that possible modafinil+caffeine interaction. Subjectively upon awakening: I don’t feel great, but I don’t feel like 2-3 hours of sleep either. N-back at 10 AM after breakfast: 25/54/44/38/33. These are not very impressive, but seem normal despite taking the last armodafinil ~9 hours ago; perhaps the 3 hours were enough. Later that day, at 11:30 PM (just before bed): 26/56/47.
2. 2 break days later, I took the quarter-pill at 11:22 PM. I had discovered I had for years physically possessed a very long interview not available online, and transcribing that seemed like a good way to use up a few hours. I did some reading, some Mnemosyne, and started it around midnight, finishing around 2:30 AM. There seemed a mental dip around 30 minutes after the armodafinil, but then things really picked up and I made very good progress transcribing the final draft of 9000 words in that period. (In comparison, “The Conscience of the Otaking” parts 2 & 4 were much easier to read than the tiny font of the RahXephon booklet, took perhaps 3 hours, and totaled only 6500 words. The nicotine is probably also to thank.) By 3:40 AM, my writing seems to be clumsier and my mind fogged. Began DNB at 3:50: 61/53/44. Went to bed at 4:05, fell asleep in 16 minutes, slept for 3:56. Waking up was easier and I felt better, so the extra hour seemed to help.
3. With this experiment, I broke from the previous methodology, taking the remaining and final half Nuvigil at midnight. I am behind on work and could use a full night to catch up. By 8 AM, I am as usual impressed by the Nuvigil - with Modalert or something, I generally start to feel down by mid-morning, but with Nuvigil, I feel pretty much as I did at 1 AM. Sleep: 9:51/9:15/8:27

I noticed on SR something I had never seen before, an offer for 150mgx10 of “Waklert” for ฿13.47 (then, ฿1 = $3.14). I searched and it seemed Sun was somehow manufacturing armodafinil! Interesting. Maybe not cost-effective, but I tried out of curiosity. They look and are packaged the same as the Modalert, but at a higher price-point: 150 rather than 81 rupees. Not entirely sure how to use them: assuming quality is the same, 150mg Waklert is still 100mg less armodafinil than the 250mg Nuvigil pills. 1. Take quarter at midnight, another quarter at 2 AM. Night runs reasonably well once I remember to eat a lot of food (I finish a big editing task I had put off for weeks), but the apathy kicks in early around 4 AM so I gave up and watched Scott Pilgrim vs. the World, finishing around 6 AM. I then read until it’s time to go to a big shotgun club function, which occupies the rest of the morning and afternoon; I had nothing to do much of the time and napped very poorly on occasion. By the time we got back at 4 PM, the apathy was completely gone and I started some modafinil research with gusto (interrupted by going to see Puss in Boots). That night: Zeo recorded 8:30 of sleep, gap of about 1:50 in the recording, figure 10:10 total sleep; following night, 8:33; third night, 8:47; fourth, 8:20 (▇▁▁▁). 2. First quarter at 1:20 AM. Second quarter at 4 AM. 20 minute nap at 7:30 AM; took show and last 2 doses at 11 AM. (If I feel bad past 3 PM, I’ll try one of the Modalerts or maybe another quarter of a Waklert - 150mg may just be too little.) Overall, pretty good day. Nights: 9:43; 9:51; 7:57; 8:25; 8:08; 9:02; 8:07 (▇█▁▂▁▄▁). 3. First half at 6 AM; second half at noon. Wrote a short essay I’d been putting off and napped for 1:40 from 9 AM to 10:40. This approach seems to work a little better as far as the aboulia goes. (I also bother to smell my urine this time around - there’s a definite off smell to it.) Nights: 10:02; 8:50; 10:40; 7:38 (2 bad nights of nasal infections); 8:28; 8:20; 8:43 (▆▃█▁▂▂▃). 4. Whole pill at 5:42 AM. (Somewhat productive night/morning beforehand.) DNB at 2 PM: 52/36/54 (▇▁█); slept for 49 minutes; DNB at 8 PM: 50/44/38/40 (▆▄▁▂). Nights: 10:02; 8:02; no data; 9:21; 8:20 (█▁ ▅▂). 5. Whole pill at 3 AM. I spend the entire morning and afternoon typing up a transcript of “Earth in My Window”. I tried taking a nap around 10 AM, but during the hour I was down, I had <5m of light sleep, the Zeo said. After I finished the transcript (~16,600 words with formatting), I was completely pooped and watched a bunch of Mobile Suit Gundam episodes, then I did Mnemosyne. The rest of the night was nothing to write home about either - some reading, movie watching, etc. Next time I will go back to split-doses and avoid typing up 110kB of text. On the positive side, this is the first trial I had available the ‘average daily grade’ Mnemosyne 2.0 plugin. The daily averages all are 3-point-something (peaking at 3.89 and flooring at 3.59), so just graphing the past 2 weeks, the modafinil day, and recovery days: ▅█▅▆▄▆▄▃▅▄▁▄▄ ▁ ▂▄▄█. Not an impressive performance but there was a previous non-modafinil day just as bad, and I’m not too sure how important a metric this is; I must see whether future trials show similar underperformance. Nights: 11:29; 9:22; 8:25; 8:41. 6. Spaced repetition at midnight: 3.68. (Graphing preceding and following days: ▅▄▆▆▁▅▆▃▆▄█ ▄ ▂▄▄▅) DNB starting 12:55 AM: 30/34/41. Transcribed Sawaragi 2005, then took a walk. DNB starting 6:45 AM: 45/44/33. Decided to take a nap and then take half the armodafinil on awakening, before breakfast. I wound up oversleeping until noon (4:28); since it was so late, I took only half the armodafinil sublingually. I spent the afternoon learning how to do “value of information” calculations, and then carefully working through 8 or 9 examples for my various pages, which I published on Lesswrong. That was a useful little project. DNB starting 12:09 AM: 30/38/48. (To graph the preceding day and this night: ▇▂█▆▅▃▃▇▇▇▁▂▄ ▅▅▁▁▃▆) Nights: 9:13; 7:24; 9:13; 8:20; 8:31. 7. Feeling behind, I resolved to take some armodafinil the next morning, which I did - but in my hurry I failed to recall that 200mg armodafinil was probably too much to take during the day, with its long half life. As a result, I felt irritated and not that great during the day (possibly aggravated by some caffeine - I wish some studies would be done on the possible interaction of modafinil and caffeine so I knew if I was imagining it or not). Certainly not what I had been hoping for. I went to bed after midnight (half an hour later than usual), and suffered severe insomnia. The time wasn’t entirely wasted as I wrote a short story and figured out how to make nicotine gum placebos during the hours in the dark, but I could have done without the experience. All metrics omitted because it was a day usage. # Nicotine Following up on my little investigation into performance & health benefits of nicotine, I decided to try it out myself since it would be both boring and hypocritical not to. The stimulant properties are well-established, and after reading up, I didn’t think there was a >3% chance it might lead me to any short or long-term future cigarette use. So I ordered the most cost-effective batch of chewing gum I could find on Amazon (100 Nicorette 4mg) - and the seller canceled on me! Poor show, “Direct Super center”, very poor show. In August 2011, after winning the spaced repetition contest and finishing up the Adderall double-blind testing, I decided the time was right to try nicotine again. I had since learned that e-cigarettes use nicotine dissolved in water, and that nicotine-water was a vastly cheaper source of nicotine than either gum or patches. So I ordered 250ml of water at 12mg/ml (total cost:$18.20). A cigarette apparently delivers around 1mg of nicotine, so half a ml would be a solid dose of nicotine, making that ~500 doses. Plenty to experiment with. The question is, besides the stimulant effect, nicotine also causes ‘habit formation’; what habits should I reinforce with nicotine? Exercise, n-backing, and spaced repetition seem like 2 good targets.

## Nicotine water

It arrived as described, a little bottle around the volume of a soda can. I had handy a plastic syringe with milliliter units which I used to measure out the nicotine-water into my tea. I began with half a ml the first day, 1ml the second day, and 2ml the third day. (My Zeo sleep scores were 85/103/86 (▁▇▁), and the latter had a feline explanation; these values are within normal variation for me, so if nicotine affects my sleep, it does so to a lesser extent than Adderall.) Subjectively, it’s hard to describe. At half a ml, I didn’t really notice anything; at 1 and 2ml, I thought I began to notice it - sort of a cleaner caffeine. It’s nice so far. It’s not as strong as I expected. I looked into whether the boiling water might be breaking it down, but the answer seems to be no - boiling tobacco is a standard way to extract nicotine, actually, and nicotine’s own boiling point is much higher than water; nor do I notice a drastic difference when I take it in ordinary water. And according to various e-cigarette sources, the liquid should be good for at least a year.

2ml is supposed to translate to 24mg, which is a big dose. I do not believe any of the commercial patches go much past that. I asked Wedrifid, whose notes inspired my initial interest, and he was taking perhaps 2-4mg, and expressed astonishment that I might be taking 24mg. (2mg is in line with what I am told by another person - that 2mg was so much that they actually felt a little sick. On the other hand, in one study, the subjects could not reliably distinguish between 1mg and placebo31.) 24mg is particularly troubling in that I weigh ~68kg, and nicotine poisoning and the nicotine LD50 start, for me, at around 68mg of nicotine. (I reflected that the entire jar could be a useful murder weapon, although nicotine presumably would be caught in an autopsy’s toxicology screen; I later learned nicotine was an infamous weapon in the 1800s before any test was developed. It doesn’t seem used anymore, but there are still fatal accidents due to dissolved nicotine.) The upper end of the range, 10mg/kg or 680mg for me, is calculated based on experienced smokers. Something is wrong here - I can’t see why I would have nicotine tolerance comparable to a hardened smoker, inasmuch as my maximum prior exposure was second-hand smoke once in a blue moon. More likely is that either the syringe is misleading me or the seller NicVape sold me something more dilute than 12mg/ml. (I am sure that it’s not simply plain water; when I mix the drops with regular water, I can feel the propylene glycol burning as it goes down.) I would rather not accuse an established and apparently well-liked supplier of fraud, nor would I like to simply shrug and say I have a mysterious tolerance and must experiment with doses closer to the LD50, so the most likely problem is a problem with the syringe. The next day I altered the procedure to sucking up 8ml, squirting out enough fluid to move the meniscus down to 7ml, and then ejecting the rest back into the container. The result was another mild clean stimulation comparable to the previous 1ml days. The next step is to try a completely different measuring device, which doesn’t change either.

One item always of interest to me is sleep; a stimulant is no good if it damages my sleep (unless that’s what it is supposed to do, like modafinil) - anecdotes and research suggest that it does. Over the past few days, my Zeo sleep scores continued to look normal. But that was while not taking nicotine much later than 5 PM. In lieu of a different ml measurer to test my theory that my syringe is misleading me, I decide to more directly test nicotine’s effect on sleep by taking 2ml at 10:30 PM, and go to bed at 12:20; I get a decent ZQ of 94 and I fall asleep in 16 minutes, a bit below my weekly average of 19 minutes. The next day, I take 1ml directly before going to sleep at 12:20; the ZQ is 95 and time to sleep is 14 minutes.

The next cheap proposition to test is that the 2ml dose is so large that the sedation/depressive effect of nicotine has begun to kick in. This is easy to test: take much less, like half a ml. I do so two or three times over the next day, and subjectively the feeling seems to be the same - which seems to support that proposition (although perhaps I’ve been placebo effecting myself this whole time, in which case the exact amount doesn’t matter). If this theory is true, my previous sleep results don’t show anything; one would expect nicotine-as-sedative to not hurt sleep or improve it. I skip the day (no cravings or addiction noticed), and take half a ml right before bed at 11:30; I fall asleep in 12 minutes and have a ZQ of ~105. The next few days I try putting one or two drops into the tea kettle, which seems to work as well (or poorly) as before. At that point, I was warned that there were some results that nicotine withdrawal can kick in with delays as long as a week, so I shouldn’t be confident that a few days off proved an absence of addiction; I immediately quit to see what the week would bring. 4 or 7 days in, I didn’t notice anything. I’m still using it, but I’m definitely a little nonplussed and disgruntled - I need some independent source of nicotine to compare with!

After trying the nicotine gum (see below) and experiencing effects, I decided the liquid was busted somehow and to request a refund. To its credit, NicVape immediately agreed to a refund.

### Poor absorption?

2 commenters point out that my possible lack of result is due to my mistaken assumption that if nicotine is absorbable through skin, mouth, and lungs it ought to be perfectly fine to absorb it through my stomach by drinking it (rather than vaporizing it and breathing it with an e-cigarette machine) - it’s apparently known that absorption differs in the stomach.

• the online book The Cigarette Papers describes early animal experiments (without specific bioavailability percentages):

The Fate of Nicotine in the Body also describes Battelle’s animal work on nicotine absorption. Using C14-labeled nicotine in rabbits, the Battelle scientists compared gastric absorption with pulmonary absorption. Gastric absorption was slow, and first pass removal of nicotine by the liver (which transforms nicotine into inactive metabolites) was demonstrated following gastric administration, with consequently low systemic nicotine levels. In contrast, absorption from the lungs was rapid and led to widespread distribution. These results show that nicotine absorbed from the stomach is largely metabolized by the liver before it has a chance to get to the brain. That is why tobacco products have to be puffed, smoked or sucked on, or absorbed directly into the bloodstream (i.e., via a nicotine patch). A nicotine pill would not work because the nicotine would be inactivated before it reached the brain.

• Absorption of nicotine across biological membranes depends on pH. Nicotine is a weak base with a pKa of 8.0 (Fowler, 1954). In its ionized state, such as in acidic environments, nicotine does not rapidly cross membranes…About 80 to 90% of inhaled nicotine is absorbed during smoking as assessed using C14-nicotine (Armitage et al., 1975). The efficacy of absorption of nicotine from environmental smoke in nonsmoking women has been measured to be 60 to 80% (Iwase et al., 1991)…The various formulations of nicotine replacement therapy (NRT), such as nicotine gum, transdermal patch, nasal spray, inhaler, sublingual tablets, and lozenges, are buffered to alkaline pH to facilitate the absorption of nicotine through cell membranes. Absorption of nicotine from all NRTs is slower and the increase in nicotine blood levels more gradual than from smoking (Table 1). This slow increase in blood and especially brain levels results in low abuse liability of NRTs (Henningfield and Keenan, 1993; West et al., 2000). Only nasal spray provides a rapid delivery of nicotine that is closer to the rate of nicotine delivery achieved with smoking (Sutherland et al., 1992; Gourlay and Benowitz, 1997; Guthrie et al., 1999). The absolute dose of nicotine absorbed systemically from nicotine gum is much less than the nicotine content of the gum, in part, because considerable nicotine is swallowed with subsequent first-pass metabolism (Benowitz et al., 1987). Some nicotine is also retained in chewed gum. A portion of the nicotine dose is swallowed and subjected to first-pass metabolism when using other NRTs, inhaler, sublingual tablets, nasal spray, and lozenges (Johansson et al., 1991; Bergstrom et al., 1995; Lunell et al., 1996; Molander and Lunell, 2001; Choi et al., 2003). Bioavailability for these products with absorption mainly through the mucosa of the oral cavity and a considerable swallowed portion is about 50 to 80% (Table 1)…Nicotine is poorly absorbed from the stomach because it is protonated (ionized) in the acidic gastric fluid, but is well absorbed in the small intestine, which has a more alkaline pH and a large surface area. Following the administration of nicotine capsules or nicotine in solution, peak concentrations are reached in about 1 h (Benowitz et al., 1991; Zins et al., 1997; Dempsey et al., 2004). The oral bioavailability of nicotine is about 20 to 45% (Benowitz et al., 1991; Compton et al., 1997; Zins et al., 1997). Oral bioavailability is incomplete because of the hepatic first-pass metabolism. Also the bioavailability after colonic (enema) administration of nicotine (examined as a potential therapy for ulcerative colitis) is low, around 15 to 25%, presumably due to hepatic first-pass metabolism (Zins et al., 1997). Cotinine is much more polar than nicotine, is metabolized more slowly, and undergoes little, if any, first-pass metabolism after oral dosing (Benowitz et al., 1983b; De Schepper et al., 1987; Zevin et al., 1997).

Particularly germane is the table of absorption by administration methods, which gives bioavailability for oral capsule (44%) and oral solution (20%)
• “An oral formulation of nicotine for release and absorption in the colon: its development and pharmacokinetics” does not break out bioavailability for their enema, but they seem to have measured levels consistent with 10-20%.
• “Absorption of nicotine by the human stomach and its effect on gastric ion fluxes and potential difference”’s abstract confirms the variation from acidity:

Nicotine was well absorbed, mean 18.6±3.4% in 15 min, on intragastric instillation at pH 9.8. Absorption was accompanied by side effects of nausea and vomiting, and delay in gastric emptying. Gastric absorption of nicotine at pH 7.4 was less marked (mean 8.2±2.9%), but was negligible at pH 1 (mean 3.3±1.4%).

• Nicotine is poorly absorbed from the stomach due to the acidity of the gastric fluid, but is well absorbed in the small intestine, which has a more alkaline pH and a large surface area [“Nicotine, its metabolism and an overview of its biological effects”].

• Tobacco and Shamanism in South America (Wilbert 1993), pg 139:

Nicotine absorption through the stomach is variable and relatively reduced in comparison with absorption via the buccal cavity and the small intestine. ‘Drinking’, ‘eating’, and swallowing of tobacco smoke by South American Indians have frequently been reported. Tenetehara shamans reach a state of tobacco narcosis through large swallows of smoke, and Tapirape shams are said to “eat smoke” by forcing down large gulps of smoke only to expel it again in a rapid sequence of belches. In general, swallowing of tobacco smoke is quite frequently likened to ‘drinking’. However, although the amounts of nicotine swallowed in this way - or in the form of saturated saliva or pipe juice - may be large enough to be behaviorally significant at normal levels of gastric pH, nicotine, like other weak bases, is not significantly absorbed.

From the standpoint of absorption, the drinking of tobacco juice and the interaction of the infusion or concoction with the small intestine is a highly effective method of gastrointestinal nicotine administration. The epithelial area of the intestines is incomparably larger than the mucosa of the upper tract including the stomach, and “the small intestine represents the area with the greatest capacity for absorption” (Levine 1983:81-83). As practiced by most of the sixty-four tribes documented here, intoxicated states are achieved by drinking tobacco juice through the mouth and/or nose…The large intestine, although functionally little equipped for absorption, nevertheless absorbs nicotine that may have passed through the small intestine.

• “Stomach absorption of intubated insecticides in fasted mice”’s abstract reports 10% stomach bioavailability in rats.

It looks like the overall picture is that nicotine is absorbed well in the intestines and the colon, but not so well in the stomach; this might be the explanation for the lack of effect, except on the other hand, the specific estimates I see are that 10-20% of the nicotine will be bioavailable in the stomach (as compared to 50%+ for mouth or lungs)… so any of my doses of >5ml should have overcome the poorer bioavailability! But on the gripping hand, these papers are mentioning something about the liver metabolizing nicotine when absorbed through the stomach, so…

## Nicotine gum

So I eventually got around to ordering another thing of nicotine gum, “Habitrol Nicotine Gum, 4mg MINT flavor COATED gum. 96 pieces per box”. Gum should be easier to double-blind myself with than nicotine patches - just buy some mint gum. If 4mg is too much, cut the gum in half or whatever. When it arrived, my hopes were borne out: the gum was rectangular and soft, which made it easy to cut into fourths.

Remembering what Wedrifid told me, I decided to start with a quarter of a piece (~1mg). The gum was pretty tasteless, which ought to make blinding easier. The effects were noticeable around 10 minutes - greater energy verging on jitteriness, much faster typing, and apparent general quickening of thought. Like a more pleasant caffeine. While testing my typing speed in Amphetype, my speed seemed to go up >=5 WPM, even after the time penalties for correcting the increased mistakes; I also did twice the usual number without feeling especially tired. A second dose was similar, and the third dose was at 10 PM before playing Ninja Gaiden II seemed to stop the usual exhaustion I feel after playing through a level or so. (It’s a tough game, which I have yet to master like Ninja Gaiden Black.) Returning to the previous concern about sleep problems, though I went to bed at 11:45 PM, it still took 28 minutes to fall sleep (compared to my more usual 10-20 minute range); the next day I use 2mg from 7-8PM while driving, going to bed at midnight, where my sleep latency is a more reasonable 14 minutes. I then skipped for 3 days to see whether any cravings would pop up (they didn’t). I subsequently used 1mg every few days for driving or Ninja Gaiden II, and while there were no cravings or other side-effects, the stimulation definitely seemed to get weaker - benefits seemed to still exist, but I could no longer describe any considerable energy or jitteriness.

The easiest way to use 2mg was to use half a gum; I tried not chewing it but just holding it in my cheek. The first night I tried, this seemed to work well for motivation; I knocked off a few long-standing to-do items. Subsequently, I began using it for writing, where it has been similarly useful. One difficult night, I wound up using the other half (for a total of 4mg over ~5 hours), and it worked but gave me a fairly mild headache and a faint sensation of nausea; these may have been due to forgetting to eat dinner, but this still indicates 3mg should probably be my personal ceiling until and unless tolerance to lower doses sets in.

### Experiment

#### Design

Blinding stymied me for a few months since the nasty taste was unmistakable and I couldn’t think of any gums with a similar flavor to serve as placebo. (The nasty taste does not seem to be due to the nicotine despite what one might expect; Vaniver plausibly suggested the bad taste might be intended to prevent over-consumption, but nothing in the Habitrol ingredient list seemed to be noted for its bad taste, and a number of ingredients were sweetening sugars of various sorts. So I couldn’t simply flavor some gum.)

I almost resigned myself to buying patches to cut (and let the nicotine evaporate) and hope they would still stick on well enough afterwards to be indistinguishable from a fresh patch, when late one sleepless night I realized that a piece of nicotine gum hanging around on my desktop for a week proved useless when I tried it, and that was the answer: if nicotine evaporates from patches, then it must evaporate from gum as well, and if gum does evaporate, then to make a perfect placebo all I had to do was cut some gum into proper sizes and let the pieces sit out for a while. (A while later, I lost a piece of gum overnight and consumed the full 4mg to no subjective effect.) Google searches led to nothing indicating I might be fooling myself, and suggested that evaporation started within minutes in patches and a patch was useless within a day. Just a day is pushing it (who knows how much is left in a useless patch?), so I decided to build in a very large safety factor and let the gum site for around a month rather than a single day.

The experiment then is straightforward: cut up a fresh piece of gum, randomly select from it and an equivalent ‘dry’ piece of gum, and do 5 rounds of dual n-back to test attention/energy & WM. (If it turns out to be placebo, I’ll immediately use the remaining active dose: no sense in wasting gum, and this will test whether nigh-daily use renders nicotine gum useless, similar to how caffeine may be useless if taken daily. If there’s 3 pieces of active gum left, then I wrap it very tightly in Saran wrap which is sticky and air-tight.) The dose will be 1mg or 1/4 a gum. I cut up a dozen pieces into 4 pieces for 48 doses and set them out to dry. Per the previous power analyses, 48 groups of DNB rounds likely will be enough for detecting small-medium effects (partly since we will be only looking at one metric - average % right per 5 rounds - with no need for multiple correction). Analysis will be one-tailed, since we’re looking for whether there is a clear performance improvement and hence a reason to keep using nicotine gum (rather than whether nicotine gum might be harmful).

Cost-wise, the gum itself (~$5) is an irrelevant sunk cost and the DNB something I ought to be doing anyway. If the results are negative (which I’ll define as d<0.2), I may well drop nicotine entirely since I have no reason to expect other forms (patches) or higher doses (2mg+) to create new benefits. This would save me an annual expense of ~$40 with a net present value of <$820\left($$); even if we count the time-value of the 20 minutes for the 5 DNB rounds over 48 days ($0.2×48×7.25=70$), it’s still a clear profit to run a convincing experiment. #### Data #### Analysis First, we’ll check the prediction score (versus a random guesser scoring 0; higher is better): logBinaryScore = sum . map (\(result,p) -> if result then 1 + logBase 2 p else 1 + logBase 2 (1-p)) logBinaryScore [(True,0.35),(False,0.40),(False,0.40),(True,0.60),(True,0.35),(False,0.45),(False,0.50), (True,0.60),(False,0.30),(True,0.50),(False,0.40),(False,0.30),(False,0.25),(False,0.75), (False,0.40),(False,0.40),(False,0.65),(False,0.45),(True,0.50),(False,0.65),(True,0.40), (True,0.55),(True,0.40),(False,0.50),(False,0.60),(True,0.40),(False,0.50),(False,0.50), (False,0.55),(True,0.55),(False,0.50),(False,0.55),(False,0.45),(True,0.55),(True,0.50), (True,0.50),(False,0.55),(True,0.50)] ~> -0.58 Ouch, so my guesses were actually worse than random; this isn’t encouraging (if nicotine was helpful, why didn’t I notice? Has 1mg tolerated?) but it does indicate the blinding was successful. Now we will examine the actual performance. Extracting the individual rounds scores from my Brain Workshop log file, we can average them in groups of 5 to get a daily average; then feed them into BEST (Bayesian equivalent of t-test; see Kruschke 2012): # individual rounds; the imbalance is unfortunate but the experiment design means nothing can be done on <- c(36,36,25,27,38,50,34,62,33,22,40,28,37,50,25,42,44,58,47,55,38,35,43,60,47,44,40,33,44, 19,58,38,41,52,41,33,47,45,45,55,45,27,35,45,30,30,52,36,28,43,50,27,29,55,45,31,15,47, 64,35,33,60,38,28,60,45,64,50,44,38,35,61,56,30,44,41,37,41,43,38) off <- c(25,34,30,40,57,34,41,51,36,26,37,42,40,45,31,24,38,40,47,35,31,27,66,25,17,43,46,50,36, 38,58,50,23,50,31,38,33,66,30,68,42,40,29,69,45,60,37,22,28,40,41,45,37,18,50,20,41,42, 47,44,60,31,46,46,55,47,42,35,40,29,47,56,37,50,20,31,42,53,27,45,50,65,33,33,33,40,47, 41,25,55,40,31,30,45,50,20,25,30,70,47,47,42,40,35,45,60,37,22,38,36,54,64,25,28,50,42, 31,50,30,30) on2 <- rowMeans(as.data.frame(matrix(on,ncol=5,byrow=TRUE))) off2 <- rowMeans(as.data.frame(matrix(off,ncol=5,byrow=TRUE))) on2 [1] 32.4 40.2 36.0 49.2 44.6 36.0 46.0 45.0 36.4 37.8 41.2 38.4 43.8 48.2 45.2 [16] 40.0 off2 [1] 37.2 37.6 39.0 36.8 33.2 42.6 42.4 47.0 45.0 37.4 38.2 38.8 47.6 38.6 42.0 [16] 39.6 42.8 41.6 39.2 38.4 41.8 38.6 44.2 36.6 source("BEST.R") mcmc = BESTmcmc(on2, off2); postInfo SUMMARY.INFO PARAMETER mean median mode HDIlow HDIhigh pcgtZero mu1 41.2808129 41.2819208 41.2272636 38.5078129 44.032699 NA mu2 40.1981087 40.1955543 40.1777039 38.6810806 41.706469 NA muDiff 1.0827042 1.0837831 1.1279921 -2.0292432 4.244909 75.87121 sigma1 5.2563674 5.0898354 4.7768681 3.3307493 7.511054 NA sigma2 3.5513796 3.4850902 3.3453379 2.4655024 4.782887 NA sigmaDiff 1.7049879 1.5917839 1.3816030 -0.6523817 4.300692 93.36015 nu 37.7948193 29.3217989 13.0664336 2.2755711 98.116623 NA nuLog10 1.4472479 1.4671906 1.5204474 0.7604963 2.101837 NA effSz 0.2460061 0.2450074 0.2361248 -0.4399959 0.936570 75.87121 The results graphed: We can read off the results from the table or graph: the nicotine days average 1.1% higher, for an effect size of 0.24; however, the 95% credible interval (equivalent of confidence interval) goes all the way from 0.93 to -0.44, so we cannot exclude 0 effect and certainly not claim confidence the effect size must be >0.1. Specifically, the analysis gives a 66% chance that the effect size is >0.1. (One might wonder if any increase is due purely to a “training effect” - getting better at DNB. Probably not32.) This is disappointing. One curious thing that leaps out looking at the graphs is that the estimated underlying standard deviations differ: the nicotine days have a strikingly large standard deviation, indicating greater variability in scores - both higher and lower, since the means weren’t very different. The difference in standard deviations is just 6.6% below 0, so the difference almost reaches our usual frequentist levels of confidence too, which we can verify by testing: var.test(on2, off2, alternative="greater") F test to compare two variances data: on2 and off2 F = 1.9823, num df = 15, denom df = 23, p-value = 0.06775 alternative hypothesis: true ratio of variances is greater than 1 95% confidence interval: 0.9314525 Inf sample estimates: ratio of variances 1.982333 We can double-check this by seeing what the variance is for the unaveraged scores: we know the means are only 1.1% different, so the additional standard deviation must be coming from how individual days are good or bad, and if that is so, then unaveraging them out to eliminate most of the observed difference. We re-run BEST: mcmc = BESTmcmc(on,off); postInfo SUMMARY.INFO PARAMETER mean median mode HDIlow HDIhigh pcgtZero mu1 41.22703657 41.22582276 41.11576792 38.7591670 43.7209215 NA mu2 40.12386083 40.12235449 40.04585340 37.9655703 42.3037602 NA muDiff 1.10317574 1.10302023 1.13446641 -2.1520680 4.4246013 74.52276 sigma1 10.91966242 10.86603052 10.74158135 9.1335897 12.7962565 NA sigma2 11.69484205 11.66111990 11.57560017 10.1050885 13.3605913 NA sigmaDiff -0.77517964 -0.79214849 -0.85774274 -3.1789680 1.6252535 25.70744 nu 46.86258782 38.65278685 22.91066668 5.8159908 109.9850644 NA nuLog10 1.57972151 1.58718081 1.60810992 1.0214182 2.1234248 NA effSz 0.09778545 0.09763823 0.09931263 -0.1895882 0.3907156 74.52276 We see the standard deviation difference go away - now the difference estimate is almost centered on zero with a just 75% estimate the standard deviation differs in the observed direction. And to repeat the frequentist test: var.test(on, off, alternative="greater") F test to compare two variances data: on and off F = 0.8564, num df = 79, denom df = 119, p-value = 0.7689 alternative hypothesis: true ratio of variances is greater than 1 95% confidence interval: 0.6140736 Inf sample estimates: ratio of variances 0.856387 (So our p-value there went from 0.06 to 0.769 when we disaggregated the days, consistent with the Bayesian results.) ##### Good days and bad days? The greatly increased variance, but only somewhat increased mean, is consistent with nicotine operating on me with an inverted U-curve for dosage/performance (or the Yerkes-Dodson law): on good days, 1mg nicotine is too much and degrades performance (perhaps I am overstimulated and find it hard to focus on something as boring as n-back) while on bad days, nicotine is just right and improves n-back performance. This would be easy to test if I had done something before taking the nicotine gum; then I would simply see if pre-gum scores were higher than post-gum scores on nicotine days, but equal on placebo days. Unfortunately, I didn’t. The closest data I have is my daily log of productivity/mood (1-5). If nicotine scores are higher than placebo scores on bad days (1-2) and lower on good days (3-4), then I think that would be consistent with an inverted U-curve. nicotine <- read.table(stdin(),header=TRUE) day active mp score 20120824 1 3 35.2 20120827 0 5 37.2 20120828 0 3 37.6 20120830 1 3 37.75 20120831 1 2 37.75 20120902 0 2 36.0 20120905 0 5 36.0 20120906 1 5 37.25 20120910 0 5 49.2 20120911 1 3 36.8 20120912 0 3 44.6 20120913 0 5 38.4 20120915 0 5 43.8 20120916 0 2 39.6 20120918 0 3 49.6 20120919 0 4 38.4 20120923 0 5 36.2 20120924 0 5 45.4 20120925 1 3 43.8 20120926 0 4 36.4 20120929 1 3 43.8 20120930 1 3 36.0 20121001 1 3 46.0 20121002 0 4 45.0 20121008 0 2 34.6 20121009 1 3 45.2 20121012 0 5 37.8 20121013 0 4 37.2 20121016 0 4 40.2 20121020 1 3 39.0 20121021 0 3 41.2 20121022 0 3 42.2 20121024 0 5 40.4 20121029 1 2 41.4 20121031 1 3 38.4 20121101 1 5 43.8 20121102 0 3 48.2 20121103 1 5 40.6 summary(nicotine) day active mp score Min. :20120824 Min. :0.0000 Min. :2.000 Min. :34.60 1st Qu.:20120911 1st Qu.:0.0000 1st Qu.:3.000 1st Qu.:37.21 Median :20120926 Median :0.0000 Median :3.000 Median :39.30 Mean :20120954 Mean :0.3947 Mean :3.632 Mean :40.47 3rd Qu.:20121015 3rd Qu.:1.0000 3rd Qu.:5.000 3rd Qu.:43.80 Max. :20121103 Max. :1.0000 Max. :5.000 Max. :49.60 cor(nicotine) day active mp score day 0.05331968 0.07437166 0.32021554 active -0.27754064 -0.05727501 mp 0.05238032 Interesting. On days ranked ‘2’ (below-average mood/productivity), nicotine seems to have boosted scores; on days ranked ‘3’, nicotine hurts scores; there aren’t enough ‘4’s to tell, but even ’5’ days seem to see a boost from nicotine, which is not predicted by the theory. But I don’t think much of a conclusion can be drawn: not enough data to make out any simple relationship. Some modeling suggests no relationship in this data either (although also no difference in standard deviations, leading me to wonder if I screwed up the data recording - not all of the DNB scores seem to match the input data in the previous analysis). So although the ‘2’ days in the graph are striking, the theory may not be right. #### Conclusion What should I make of all these results? • The poor prediction performance, while confirming my belief that my novel strategy for blinding nicotine gum worked well, undermines confidence in the value of nicotine. • I specified at the beginning that I wanted an effect size of >0.2; I got it, but with it came a very wide credible interval, undermining confidence in the effect size. • The difference in standard deviations is not, from a theoretical perspective, all that strange a phenomenon: at the very beginning of this page, I covered some basic principles of nootropics and mentioned how many stimulants or supplements follow a inverted U-curve where too much or too little lead to poorer performance (ironically, one of the examples in Kruschke 2012 was a smart drug which did not affect means but increased standard deviations). If this is the case, this suggests some thoughtfulness about my use of nicotine: there are times when use of nicotine will not be helpful, but times where it will be helpful. I don’t know what makes the difference, but I can guess it relates to over-stimulation: on some nights during the experiment, I had difficult concentrating on n-backing because it was boring and I was thinking about the other things I was interested in or working on - in retrospect, I wonder if those instances were nicotine nights. In retrospect, there were 2 parts of the experiment design I probably should have changed: 1. I used 1mg gum, rather than 2mg 1mg may have too small effects to easily detect, and I may have developed tolerance to 1mg even though I’ve been careful to space out all my gum use. 2mg would have reduced this concern. 2. I used 1mg each day regardless of the randomization This was to make each day more consistent and avoid wasting a sliced piece of gum (due to evaporation, it’s use-it-or-lose-it). But this plausibly is a source of tolerance, and even #1 was not an issue when the self-experiment began, this could have become an issue. All things considered, I will probably continue using nicotine gum sparingly. ## Nicotine patches Running low on gum (even using it weekly or less, it still runs out), I decided to try patches. Reading through various discussions, I couldn’t find any clear verdict on what patch brands might be safer (in terms of nicotine evaporation through a cut or edge) than others, so I went with the cheapest Habitrol I could find as a first try of patches (“Nicotine Transdermal System Patch, Stop Smoking Aid, 21 mg, Step 1, 14 patches”). I am curious to what extent nicotine might improve a long time period like several hours or a whole day, compared to the shorter-acting nicotine gum which feels like it helps for an hour at most and then tapers off (which is very useful in its own right for kicking me into starting something I have been procrastinating on). I have not decided whether to try another self-experiment. # Noopept Related to the famous -racetams but reportedly better (and much less bulky), Noopept is one of the many obscure Russian nootropics. (Further reading: Google Scholar, Examine.com, Reddit, Longecity, Bluelight.ru.) Its advantages seem to be that it’s far more compact than piracetam and doesn’t taste awful so it’s easier to store and consume; doesn’t have the cloud hanging over it that piracetam does due to the FDA letters, so it’s easy to purchase through normal channels; is cheap on a per-dose basis; and it has fans claiming it is better than piracetam. A Redditor ordered some Russian brand Noopept, but finding it was unpleasant & not working for him, gave the left-over half to me: It appeared in reasonably good shape, and closely matched the photographs in the Wikipedia article. I took 2 of the 25 10mg pills on successive days on top of my usual caffeine+piracetam stack, and didn’t notice anything; in particular, I didn’t find it unpleasant like he did. ## Pilot experiment So, I thought I might as well experiment since I have it. I put the 23 remaining pills into gel capsules with brown rice as filling, made ~30 placebo capsules, and will use the one-bag blinding/randomization method. I don’t want to spend the time it would take to n-back every day, so I will simply look for an effect on my daily mood/productivity self-rating; hopefully Noopept will add a little on average above and beyond my existing practices like caffeine+piracetam (yes, Noopept may be as good as piracetam, but since I still have a ton of piracetam from my 3kg order, I am primarily interested in whether Noopept adds onto piracetam rather than replaces). 10mg doses seem to be on the low side for Noopept users, weakening the effect, but on the other hand, if I were to take 2 capsules at a time, then I’d halve the sample size; it’s not clear what is the optimal tradeoff between dose and n for statistical power. Nor am I sure how important the results are - partway through, I haven’t noticed anything bad, at least, from taking Noopept. And any effect is going to be subtle: people seem to think that 10mg is too small for an ingested rather than sublingual dose and I should be taking twice as much, and Noopept’s claimed to be a chronic gradual sort of thing, with less of an acute effect. If the effect size is positive, regardless of statistical-significance, I’ll probably think about doing a bigger real self-experiment (more days blocked into weeks or months & 20mg dose) ### Power I don’t expect to find an effect, though; a quick t-test power analysis of a one-sided paired design with 23 pairs suggests that a reasonable power of 80% would still only be able to detect an increase of d>=0.5: pwr.t.test(n=23, type="paired", alternative="greater", sig.level=0.05, power=0.8) Paired t test power calculation n = 23 d = 0.5352 ... Or in other words, since the standard deviation of my previous self-ratings is 0.75 (see the Weather and my productivity data), a mean rating increase of >0.39 on the self-rating. This is, unfortunately, implying an extreme shift in my self-assessments (for example, 3s are ~50% of the self-ratings and 4s ~25%; to cause an increase of 0.25 while leaving 2s alone in a sample of 23 days, one would have to push 3s down to ~25% and 4s up to ~47%). So in advance, we can see that the weak plausible effects for Noopept are not going to be detected here at our usual statistical levels with just the sample I have (a more plausible experiment might use 178 pairs over a year, detecting down to d>=0.18). But if the sign is right, it might make Noopept worthwhile to investigate further. And the hardest part of this was just making the pills, so it’s not a waste of effort. ### Data Available as a CSV spanning 15 May - 9 July 2013, with magnesium l-threonate consumption as a covariate (see the magnesium section). ### Analysis Some quick tests turn in similar conclusions: both Noopept and the “Magtein” increased self-rating but not statistically-significantly (as expected from the beginning due to the lack of power). R> npt <- read.csv("http://www.gwern.net/docs/nootropics/2013-gwern-noopept.csv") R> wilcox.test(MP ~ Noopept, alternative="less", data = npt) Wilcoxon rank sum test with continuity correction data: MP by Noopept W = 343, p-value = 0.2607 R> summary(lm(MP ~ Noopept + Magtein, data = npt)) Residuals: Min 1Q Median 3Q Max -1.1597 -0.8038 -0.0711 0.8403 1.1962 Coefficients: Estimate Std. Error t value Pr(>|t|) (Intercept) 2.8038 0.1556 18.02 <2e-16 Noopept 0.0886 0.2098 0.42 0.67 Magtein 0.2673 0.2070 1.29 0.20 Residual standard error: 0.761 on 53 degrees of freedom Multiple R-squared: 0.0379, Adjusted R-squared: 0.00164 F-statistic: 1.05 on 2 and 53 DF, p-value: 0.359 More specifically, the ordinal logistic regression estimates effect sizes of odds-ratio 1.3 for the Noopept and 1.9 for the magnesium: library(rms) npt$MP <- as.ordered(npt$MP) lmodel <- lrm(MP ~ Noopept + Magtein, data = npt); lmodel ... Coef S.E. Wald Z Pr(>|Z|) y>=3 0.4330 0.4049 1.07 0.2849 y>=4 -1.4625 0.4524 -3.23 0.0012 Noopept 0.2336 0.5114 0.46 0.6479 Magtein 0.6748 0.5098 1.32 0.1856 The magnesium was neither randomized nor blinded and included mostly as a covariate to avoid confounding (the Noopept coefficient & t-value increase somewhat without the Magtein variable), so an OR of 1.9 is likely too high; in any case, this experiment was too small to reliably detect any effect (~26% power, see bootstrap power simulation in the magnesium section) so we can’t say too much. set.seed(3333) library(boot) noopeptPower <- function(dt, indices) { d <- dt[indices,] # bootstrap's _n_ = original _n_ lmodel <- lrm(MP ~ Noopept + Magtein, data = d) return(anova(lmodel)[7]) # _p_-value for the Noopept coefficient } bs <- boot(data=npt, statistic=noopeptPower, R=100000, parallel="multicore", ncpus=4) alpha <- 0.05 print(sum(bs$t<=alpha) / length(bs$t)) # [1] 0.073 So for the observed effect size, the small Noopept sample had only 7% power to turn in a statistically-significant result. Given the plausible effect size, and weakness of the experiment, I find these results encouraging. ## Noopept followup experiment ### Power In avoiding experimenting with more Russian Noopept pills and using instead the easily-purchased powder form of Noopept, there are two opposing considerations: Russian Noopept is reportedly the best, so we might expect anything I buy online to be weaker or impure or inferior somehow and the effect size smaller than in the pilot experiment; but by buying my own supply & using powder I can double or triple the dose to 20mg or 30mg (to compensate for the original under-dosing of 10mg) and so the effect size larger than in the pilot experiment. I’ll first assume the effect size is the same. Using the usual alpha, we can find the necessary sample size by a slight variation on the magnesium bootstrap power calculation. Since the 56 days gave a power of 7% while we want closer to 80%, we probably want to start our power estimation much higher, with n in the 300s: library(boot) library(rms) npt <- read.csv("http://www.gwern.net/docs/nootropics/2013-gwern-noopept.csv") newNoopeptPower <- function(dt, indices) { d <- dt[sample(nrow(dt), n, replace=TRUE), ] # new dataset, possibly larger than the original lmodel <- lrm(MP ~ Noopept + Magtein, data = d) return(anova(lmodel)[7]) } alpha <- 0.05 for (n in seq(from = 300, to = 600, by = 30)) { bs <- boot(data=npt, statistic=newNoopeptPower, R=10000, parallel="multicore", ncpus=4) print(c(n, sum(bs$t<=alpha)/length(bs$t))) } # 0.18/0.19/0.21/0.21/0.23/0.25/0.26/0.28/0.29/0.32/0.32 Even at n=600 (nearly 2 years), the estimated power is only 32%. This is absurdly small and such an experiment would be a waste of time. Suppose we were optimistic and we doubled the effect from 0.23 to 0.47 (this can be done by editing the first two Noopept rows and incrementing the MP variable by 1), and then looked again at power? At n=300, power has reached 60%, and by n=530, we have hit the desired 80%. npt[1,2] <- npt[1,2] + 1 npt[2,2] <- npt[2,2] + 1 n <- 530 bs <- boot(data=npt, statistic=newNoopeptPower, R=100000, parallel="multicore", ncpus=4) print(c(n, sum(bs$t<=alpha)/length(bs$t))) [1] 530.0000 0.8241 530 is better, but still far too long an experiment. I may try a second pilot experiment with magnesium held constant to try to get a better effect size estimate - in the first pilot experiment, the Noopept & Magtein tended to coincide (collinearity), making the effect unclear and possibly underestimated. ### Design As it happened, Health Supplement Wholesalers offered me a sample of their products, including their 5g Noopept powder ($13). I’d never used HSW before & they had some issues in the past; but I haven’t seen any recent complaints, so I was willing to try them. My 5g from batch #130830 arrived quickly (photos: packaging, powder contents). I tried some (tastes just slightly unpleasant, like an ultra-weak piracetam), and I set about capping the fluffy white flour-like powder with the tiny little scoop they provide.

It took 4 hours to cap 432 Noopept pills and another 432 flour pills. I tried to allocate the Noopept as evenly as possible (3 little scoops per pill) which the HSW packaging suggested would be 10-30mg; running out after 432 implies I managed to get ~12mg into each ($\frac{5000}{432}=11.6$). At 2 pills a day, the experiment will run under a year. I don’t want to collide with the magnesium or lithium experiments, so I’ll use paired blocks of 3 days, which will help with the reported tolerance of Noopept. To make things more interesting, I think I would like to try randomizing different dosages as well: 12mg, 24mg, and 36mg (1-3 pills); on 5 May 2014, because I wanted to finish up the experiment earlier, I decided to add 2 larger doses of 48 & 60mg (4-5 pills) as options. Then I can regress over dose amount, and then meta-regress including the previous experiment (which used 20mg doses).

1. 20mg: 15 September - 17 September: 0

18 - 20 September: 1
2. 30mg: 21 September - 23? September: 1

24 - 26: 0
3. 20mg: 27 - 29 September: 0

30 - 2 October: 1
4. 10mg: 3 - 5 October: 1

6 - 8 October: 0
5. 30mg: 9 - 11 October: 1

12 - 14 October: 0
6. 10mg: 15 - 17 October: 1

18 - 20 October: 0
7. 30mg: 22 - 24 October: 1

25 - 27 October: 0
8. 10mg: 28 - 30 October: 1

31 - 2 November: 0
9. 30mg: 4 - 6 November: 1

7 - 9 November: 0
10. 20mg: 11 - 13 Nov: 0

14 - 16 Nov: 1
11. 30mg: 20 - 22 November: 1

23 - 25 November: 0
12. 20mg: 26 - 28 November: 1

29 - 1 December: 0
13. 30mg: 2 - 4 December: 1

5 - 7 December: 0
14. 10mg: 8 - 10 December: 1

11 - 13 December: 0
15. 30mg: 14 - 16 December: 0

17 - 19 December: 1
16. 20mg: 20 - 22 December: 0

27 - 29 December: 1
17. 10mg: 1 - 3 January 2014: 1

4 - 6 January 2014: 0
18. 30mg: 7 - 9 January: 1

10 - 12 January: 0
19. 10mg: 13 - 15 January: 1

16 - 17 January: 0
20. 20mg: 18 - 20 January: 0

21 - 23 January: 1
21. 30mg: 25 - 27 January: 0

28 - 30 January: 1
22. 10mg: 31 January - 2 February: 1

3 - 5 February: 0
23. 30mg: 8 - 10 February: 1

11 - 13 February: 1
24. 10mg: 14 - 16 February: 0

17 - 19 February: 1
25. 30mg: 20 - 22 February: 1

22 - 25 February: 0
26. 20mg: 26 - 28 February: 0

1 March - 3 March: 1
27. 10mg: 4 March - 6 March: 1

7 March - 9 March: 0
28. 30mg: 10 - 11 March: 0; accidentally unblinded & restarted on the 12th (a spare rice placebo, which is visibly different from the flour/Noopept capsules, was mixed in)
29. 30mg: 12 - 14 March : 1

15 - 17 March: 0
30. 20mg: 18 - 20 March: 0

21 - 23 March: 1
31. 10mg: 24 - 26 March: 1

27 - 29 March: 0
32. 20mg: 30 - 1 April: 0

2 - 4 April: 1
33. 10mg: 5 - 7 April: 1

8 - 10 April: 0
34. 30mg: 11 - 13 April: 1

14 - 16 April: 0
35. 20mg: 17 - 19 April: 0

20 - 22 April: 1
36. 10mg: 23 - 25 April: 1

26 - 28 April: 0
37. 30mg: 29 - 1 May: 1

2 - 4 May: 0
38. 48mg: 5 - 7? May: 0

8 - 10 May: 1
39. 60mg: 11 - 13 May: 0

14 - 17 May: 1
40. 20mg: 18 - 20 May: 0

21 - 23 May: 1
41. 48mg: 24 - 26 May: 1

27 - 29 May: 0
42. 60mg: 30 - 1 June: 0

2 - 4 June: 1
43. 30mg: 5 - 7 June: 1

8 - 10 June: 0
44. 5x: 11 - 13 June: 1

14 - 16 June: 0
45. 3x: 17 - 19 June: 0

20 - 22 June: 1
46. 5x: 23 - 25 June: 0

26 - 28 June: 1
47. 4x: 29 June - 1 July: 1

2 - 4 July: 0
48. 3x: 5 - 7 July: 1

8 - 9 July: 0
49. 5x: 10 - 12 July: 1

13 - 15 July: 0
50. 3x: 16 - 18 July: 0

19 - 21 July: 1
51. 4x: 23 - 25 July: 0

26 - 28 July: 1
52. 5x: 29 - 31 July: 0

1 - 3 August: 1
53. 3x: 4 - 6 August: 1

7 - 9 August: 0
54. 3x: 10 - 12 August: 0

13 - 15 August: 1
55. 3x: 16 - 18 August: 0

19 - 21 August: 1
56. 2x: 23 - 25? August: 0

26 - 28 August: 1

Oxiracetam is one of the 3 most popular -racetams; less popular than piracetam but seems to be more popular than aniracetam. Prices have come down substantially since the early 2000s, and stand at around 1.2g/$or roughly 50 cents a dose, which was low enough to experiment with; key question, does it stack with piracetam or is it redundant for me? (Oxiracetam can’t compete on price with my piracetam pile stockpile: the latter is now a sunk cost and hence free.) I bought 60 grams from Smart Powders and combined it with the DMAE; I couldn’t compare oxiracetam+DMAE vs oxiracetam+choline-bitartrate because I had capped all the choline with the piracetam. One immediate advantage of oxiracetam: it is not unbelievably foul tasting like piracetam, but slightly sweet. Regardless, while in the absence of piracetam, I did notice some stimulant effects (somewhat negative - more aggressive than usual while driving) and similar effects to piracetam, I did not notice any mental performance beyond piracetam when using them both. The most I can say is that on some nights, I seemed to be less easily tired when writing or editing or n-backing (and I felt less tired than ICON 2011 than ICON 2010), but those were also often nights I was also trying out all the other things I had gotten in that order from Smart Powders, and I am still dis-entangling what was responsible. (Probably the l-theanine or sulbutiamine.) In other words, for me, the two -racetams did not seem to ‘stack’. The following are a number of n-back scores from before (piracetam only) and after (piracetam and oxiracetam): 1. [28,39,26,48,34]; [34,60]; [37,53,55] (▁▂▁▄▁▁▆▂▄▅▆) 2. [56,66,44,46,30,24,50,56,34,39,34]; [30,50,31,37,41,23]; [53,35,40] (▅▇▃▃▁▁▄▅▁▂▁▁▄▁▂▂▁▄▁▂) There may be some improvement hidden in there, but nothing jumps out to my eye. Oxiracetam has smaller recommended doses than piracetam, true, but even after taking that into account, oxiracetam is still more expensive per dose. When I finished it off, I decided it hadn’t shown any benefits so there was no point in continuing it. # Piracetam I bought 500g of piracetam (Examine.com; FDA adverse events) from Smart Powders (piracetam is one of the cheapest nootropics and SP was one of the cheapest suppliers; the others were much more expensive as of October 2010), and I’ve tried it out for several days (started on 7 September 2009, and used it steadily up to mid-December). I’ve varied my dose from 3 grams to 12 grams (at least, I think the little scoop measures in grams), taking them in my tea or bitter fruit juice. Cranberry worked the best, although orange juice masks the taste pretty well; I also accidentally learned that piracetam stings horribly when I got some on a cat scratch. 3 grams (alone) didn’t seem to do much of anything while 12 grams gave me a nasty headache. I also ate 2 or 3 eggs a day. Subjectively, I didn’t notice drastic changes. Here’s what I did notice: • My thinking seems a little clearer • I’m not so easy to tire - I went through a month’s worth of my Wikipedia watchlist with less fatigue than usual, and n-backing doesn’t seem so tiring. • DNB-wise, eyeballing my stats file seems to indicate a small increase: when I compare peak scores D4B scores, I see mostly 50s and a few 60s before piracetam, and after starting piracetam, a few 70s mixed into the 50s and 60s. Natural increase from training? Dunno - I’ve been stuck on D4B since June, so 5 or 10% in a week or 3 seems a little suspicious. A graph of the score series33: ▁▅▂▁▅▅▂▄▁▂▁▄▄▁▄▂▁▃▃▂▂▂▁▆▁▂▁▄▃▁▃▄▁▄▁▂▅▅▂▃▁▃▃▂▄▂▄▇▄▄▄▅▃▄▂▄▅▅▁▅▃▃▄▅▅▃▃▂▄▄▃▄▆▃▅▃▄▅ ▃▅▄▄▄▂▄▂▄▃▄▄▃▄▄▂▃▆▂▁ vs ▆▅▆▄▄▅▃▅▁▁▃▄▅▃▁▅▃▅▂▃▄▃▁▄▅▅▂▃▁▁▆▃▁▄▄▃▁▅▄▄▃▃▄▂▅▃▁▄▂▅▃▆▆▂▃▃▆▄▃▃▂▂▂▁▄▃▃▄▄▂ • The other day, I also noticed I was fidgeting less • After a week or two, I think I noticed better reflexes - both in catching falling cups and the saccading in BW seems slightly easier. But I could be imagining this since I just saw an Erowid report mentioning better reflexes & I may’ve read that one before I started. (Darn those subconscious impressions and memories! :) After 7 days, I ordered a kg of choline bitartrate from Bulk Powders. Choline is standard among piracetam-users because it is pretty universally supported by anecdotes about “piracetam headaches”, has support in rat/mice experiments34, and also some human-related research. So I figured I couldn’t fairly test piracetam without some regular choline - the eggs might not be enough, might be the wrong kind, etc. It has a quite distinctly fishy smell, but the actual taste is more citrus-y, and it seems to neutralize the piracetam taste in tea (which makes things much easier for me). The first day (22 September) I took ~10g since I was taking 5g of piracetam; I wound up with some diarrhea & farting. Oops. On the plus side: - I noticed the less-fatigue thing to a greater extent, getting out of my classes much less tired than usual. (Caveat: my sleep schedule recently changed for the saner recently, so it’s possible that’s responsible. I think it’s more the piracetam+choline, though.) - One thing I wasn’t expecting was a decrease in my appetite - nobody had mentioned that in their reports.I don’t like being bothered by my appetite (I know how to eat fine without it reminding me), so I count this as a plus. - Fidgeting was reduced further The second day I went with ~6g of choline; much less intestinal distress, but similar effects vis-a-vis fidgeting, loss of appetite, & reduced fatigue. So in general I thought this was a positive experience, but I’m not sure it was worth$40 for ~2 months’ worth, and it was tedious consuming it dissolved.

Fortunately for me, the FDA decided Smart Powder’s advertising was too explicit and ordered its piracetam sales stopped; I was equivocal at the previous price point, but then I saw that between the bulk discount and the fire-sale coupon, 3kg was only $99.99 (shipping was amortized over that, the choline, caffeine, and tryptophan). So I ordered in September 2010. As well, I had decided to cap my own pills, eliminating the inconvenience and bad taste. 3kg goes a very long way so I am nowhere close to running out of my pills; there is nothing to report since, as the pills are simply part of my daily routine. ## Piracetam natural experiment I take my piracetam in the form of capped pills consisting (in descending order) of piracetam, choline bitartrate, anhydrous caffeine, and l-tyrosine. On 8 December 2012, I happened to run out of them and couldn’t fetch more from my stock until 27 December. This forms a sort of (non-randomized, non-blind) short “natural experiment”: did my daily 1-5 mood/productivity ratings fall during 8-27 December compared to November 2012 & January 2013? The graphed data35 suggests to me a decline: The BEST results36 give a small effect size of -0.26 and only partial exclusion of zero effect size (which a one-tailed two-sample test agrees with37): So the answer is yes, M/P did fall as I expected; but also as one would expect given daily variation and the small sample of ‘off’ days (19 days), the result is not very statistically robust (even ignoring the low quality of data from a natural experiment). But it was an easy ‘experiment’ to run and the result had the right sign, as they say. # Potassium In the 2011-2012 Quantified Health Prize, potassium (FDA adverse events) came up twice as a recommendation. Potassium is vital to nerve conduction, since nerve impulses are nothing but potassium and sodium rushing around, but it didn’t seem like a priority to investigate since I am not an athlete nor do I sweat a great deal. A LessWrong user Kevin claimed it worked well for him: By which I mean that simple potassium is probably the most positively mind altering supplement I’ve ever tried…About 15 minutes after consumption, it manifests as a kind of pressure in the head or temples or eyes, a clearing up of brain fog, increased focus, and the kind of energy that is not jittery but the kind that makes you feel like exercising would be the reasonable and prudent thing to do. I have done no tests, but “feel” smarter from this in a way that seems much stronger than piracetam or any of the conventional weak nootropics. It is not just me – I have been introducing this around my inner social circle and I’m at 7/10 people felt immediately noticeable effects. The 3 that didn’t notice much were vegetarians and less likely to have been deficient. Now that I’m not deficient, it is of course not noticeable as mind altering, but still serves to be energizing, particularly for sustained mental energy as the night goes on…Potassium chloride initially, but since bought some potassium gluconate pills… research indicates you don’t want to consume large amounts of chloride (just moderate amounts). …The first time I took supplemental potassium (50% US RDA in a lot of water), it was like a brain fog lifted that I never knew I had, and I felt profoundly energized in a way that made me feel exercise was reasonable and prudent, which resulted in me and the roommate that had just supplemented potassium going for an hour long walk at 2AM. Experiences since then have not been quite so profound (which probably was so stark for me as I was likely fixing an acute deficiency), but I can still count on a moderately large amount of potassium to give me a solid, nearly side effect free performance boost for a few hours…I had been doing Bikram yoga on and off, and I think I wasn’t keeping up the practice because I wasn’t able to properly rehydrate myself. One claim was partially verified in passing by Eliezer Yudkowsky (“Supplementing potassium (citrate) hasn’t helped me much, but works dramatically for Anna, Kevin, and Vassar…About the same as drinking a cup of coffee - i.e., it works as a perker-upper, somehow. I’m not sure, since it doesn’t do anything for me except possibly mitigate foot cramps.”) I largely ignored this since the discussions were of sub-RDA doses, and my experience has usually been that RDAs are a poor benchmark and frequently far too low (consider the RDA for vitamin D). This time, I checked the actual RDA - and was immediately shocked and sure I was looking at a bad reference: there was no way the RDA for potassium was seriously 3700-4700mg or 4-5 grams daily, was there? Just as an American, that implied that I was getting less than half my RDA. (How would I get 4g of potassium in the first place? Eat a dozen bananas a day⸮) I am not a vegetarian, nor is my diet that fantastic: I figured I was getting some potassium from the ~2 fresh tomatoes I was eating daily, but otherwise my diet was not rich in potassium sources. I have no blood tests demonstrating deficiency, but given the figures, I cannot see how I could not be deficient. Potassium is not the safest supplement ever, but it’s reasonably safe (kidneys can filter out overdoses), and between the anecdotes and my sudden realization that I was highly likely deficient, I decided to try it out. Potassium citrate powder is neither expensive nor cheap: I purchased 453g for$21. The powder is crystalline white, dissolves instantly in water, and largely tasteless (sort of saline & slightly unpleasant). The powder is 37% potassium by weight (the formula is C6H5K3O7) so 453g is actually 167g of potassium, so 80-160 days’ worth depending on dose.

My first impression of ~1g around 12:30PM was that while I do not feel like running around, within an hour I did feel like the ‘brain fog’ was lighter than before. The effect wasn’t dramatic, so I can’t be very confident. Operationalizing ‘brain fog’ for an experiment might be hard: it doesn’t necessarily feel like I would do better on dual n-back. I took 2 smaller doses 3 and 6 hours later, to no further effect. Over the following weeks and months, I continued to randomly alternate between potassium & non-potassium days. I noticed no effects other than sleep problems.

## Potassium sleep

That first night, I had severe trouble sleeping, falling asleep in 30 minutes rather than my usual 19.6±11.9, waking up 12 times (5.9±3.4), and spending ~90 minutes awake (18.1±16.2), and naturally I felt unrested the next day; I initially assumed it was because I had left a fan on (moving air keeps me awake) but the new potassium is also a possible culprit. When I asked, Kevin said:

I think a general high water high electrolyte diet has benefited my sleep. I haven’t noticed potassium immediately before bed decreasing sleep quality.

I began recording a subset of sleep data by hand as another sleep experiment. The conclusion was that there was a very strong negative effect on my sleep (d=-1.1) and no benefit to my mood/productivity self-ratings.

Since my experiment had a number of flaws (non-blind, varying doses at varying times of day), I wound up doing a second better experiment using blind standardized smaller doses in the morning. The negative effect was much smaller, but there was still no mood/productivity benefit. Having used up my first batch of potassium citrate in these 2 experiments, I will not be ordering again since it clearly doesn’t work for me.

# Selegiline / Deprenyl

Selegilineis a somewhat popular (Erowid, r/nootropics, FDA adverse events) stimulant/anti-depressant which affects dopamine.

# Testosterone

The hormone testosterone (Examine.com; FDA adverse events) needs no introduction. This is one of the scariest substances I have considered using: it affects so many bodily systems in so many ways that it seems almost impossible to come up with a net summary, either positive or negative. With testosterone, the problem is not the usual nootropics problem that that there is a lack of human research, the problem is that the summary constitutes a textbook - or two. That said, the 2011 review “The role of testosterone in social interaction” (excerpts) gives me the impression that testosterone does indeed play into risk-taking, motivation, and social status-seeking; some useful links and a representative anecdote:

• “The Manly Molecule”, Steve Sailer 2000
• Wedrifid, 2012:

While the primary effect of the drug is massive muscle growth the psychological side effects actually improved his sanity by an absurd degree. He went from barely functional to highly productive. When one observes that the decision to not attempt to fulfill one’s CEV at a given moment is a bad decision it follows that all else being equal improved motivation is improved sanity.

Elaborating on why the psychological side effects of testosterone injection are individual dependent: Not everyone get the same amount of motivation and increased goal seeking from the steroid and most people do not experience periods of chronic avolition. Another psychological effect is a potentially drastic increase in aggression which in turn can have negative social consequences. In the case of counterfactual wedrifid he gets a net improvement in social consequences. He has observed that aggression and anger are a prompt for increased ruthless self-interested goal seeking. Ruthless self-interested goal seeking involves actually bothering to pay attention to social politics. People like people who do social politics well. Most particularly it prevents acting on contempt which is what wedrifid finds prompts the most hostility and resentment in others. Point is, what is a sanity promoting change in one person may not be in another.

As it happens, these are areas I am distinctly lacking in. When I first began reading about testosterone I had no particular reason to think it might be an issue for me, but it increasingly sounded plausible, an aunt independently suggested I might be deficient, a biological uncle turned out to be severely deficient with levels around 90 ng/dl (where the normal range for 20-49yo males is 249-839), and finally my blood test in August 2013 revealed that my actual level was 305 ng/dl; inasmuch as I was 25 and not 49, this is a tad low.

One idea I’ve been musing about is the connections between IQ, Conscientiousness, and testosterone. IQ and Conscientiousness do not correlate to a remarkable degree - even though one would expect IQ to at least somewhat enable a long-term perspective, self-discipline, metacognition, etc! There are indications in studies of gifted youth that they have lower testosterone levels. The studies I’ve read on testosterone indicate no improvements to raw ability. So, could there be a self-sabotaging aspect to human intelligence whereby greater intelligence depends on lack of testosterone, but this same lack also causes lack of correlation with Conscientiousness, vastly undermining the utility of greater intelligence? Could cases of high IQ types who suddenly stop slacking and accomplish great things sometimes be due to changes in testosterone? Studies on the correlations between IQ, testosterone, Conscientiousness, and various measures of accomplishment are confusing and don’t always support this theory, but it’s an idea to keep in mind.

One might suggest just going to the gym or doing other activities which may increase endogenous testosterone secretion. This would be unsatisfying to me as it introduces confounds: the exercise may be doing all the work in any observed effect, and certainly can’t be blinded. And blinding is especially important because the 2011 review discusses how some studies report that the famed influence of testosterone on aggression (eg. Wedrifid’s anecdote above) is a placebo effect caused by the “folk wisdom” that testosterone causes aggression & rage!

I have a needle phobia, so injections are right out; but from the images I have found, it looks like testosterone gels resemble other gels like Vaseline. This suggests an easy experimental procedure: spoon an appropriate dose of testosterone gel into one opaque jar, spoon some Vaseline gel into another, and pick one randomly to apply while not looking. If one gel evaporates but the other doesn’t, or they have some other difference in behavior, the procedure can be expanded to something like “and then half an hour later, take a shower to remove all visible traces of the gel”. Testosterone itself has a fairly short half-life of 2-4 hours, but the gel or effects might linger. (Injections apparently operate on a time-scale of weeks; I’m not clear on whether this is because the oil takes that long to be absorbed by surrounding materials or something else.) Experimental design will depend on the specifics of the obtained substance. As a controlled substance (Schedule III in the US), supplies will be hard to obtain; I may have to resort to the Silk Road.

Power-wise, the effects of testosterone are generally reported to be strong and unmistakable. Even a short experiment should work. I would want to measure DNB scores & Mnemosyne review averages as usual, to verify no gross mental deficits; the important measures would be physical activity, so either pedometer or miles on treadmill, and general productivity/mood. The former 2 variables should remain the same or increase, and the latter 2 should increase.

Either prescription or illegal, daily use of testosterone would not be cheap. On the other hand, if I am one of the people for whom testosterone works very well, it would be even more valuable than modafinil, in which case it is well worth even arduous experimenting. Since I am on the fence on whether it would help, this suggests the value of information is high.

# Theanine

l-theanine (Examine.com) is occasionally mentioned on Reddit or Imminst or LessWrong39 but is rarely a top-level post or article; this is probably because theanine was discovered a very long time ago (>61 years ago), and it’s a pretty straightforward substance. It’s a weak relaxant/anxiolytic (Google Scholar) which is possibly responsible for a few of the health benefits of tea, and which works synergistically with caffeine (and is probably why caffeine delivered through coffee feels different from the same amount consumed in tea - in one study, separate caffeine and theanine were a mixed bag, but the combination beat placebo on all measurements). The half-life in humans seems to be pretty short, with van der Pijl 2010 putting it ~60 minutes. This suggests to me that regular tea consumption over a day is best, or at least that one should lower caffeine use - combining caffeine and theanine into a single-dose pill has the problem of caffeine’s half-life being much longer so the caffeine will be acting after the theanine has been largely eliminated. The problem with getting it via tea is that teas can vary widely in their theanine levels and the variations don’t seem to be consistent either, nor is it clear how to estimate them. (If you take a large dose in theanine like 400mg in water, you can taste the sweetness, but it’s subtle enough I doubt anyone can actually distinguish the theanine levels of tea; incidentally, r-theanine - the useless racemic other version - anecdotally tastes weaker and less sweet than l-theanine.)

On 8 April 2011, I purchased from Smart Powders (20g for $8); as before, some light searching seemed to turn up SP as the best seller given shipping overhead; tt was on sale and I planned to cap it so I got 80g. This may seem like a lot, but I was highly confident that theanine and I would get along since I already drink so much tea and was a tad annoyed at the edge I got with straight caffeine. So far I’m pretty happy with it. My goal was to eliminate the physical & mental “twitchiness” of caffeine, which subjectively it seems to do. Running low on my theanine in May 2013, I learned SP was now undercut by LiftMode selling 50g for$14, so I got 2 (I was doing a big Amazon order anyway). Like the SP theanine it is a nice fluffy white powder and seems to work as well.

# TruBrain

A new all-in-one nootropic mix/company run by some people active on /r/nootropics; they offered me a month’s supply for free to try & review for them. At ~$100 a month (it depends on how many months one buys), it is not cheap (John Backus estimates one could buy the raw ingredients for$25/month) but it provides convenience & is aimed at people uninterested in spending a great deal of time reviewing research papers & anecdotes or capping their own pills (ie. people with lives) and it’s unlikely I could spare the money to subscribe if TruBrain worked well for me - but certainly there was no harm in trying it out.

The ingredients list was sane and similar to what I would have chosen, and doesn’t include any jokers like caffeine:

1. Piracetam: 3g

Naturally, as piracetam is the standard -racetam to use. It’s always worked well for me. 3g is a reasonable amount for people who aren’t taking any other sources of piracetam.
2. ALCAR: 0.5g

I didn’t notice any personal benefits from ALCAR, but I didn’t notice any bad effects either and many people claim to benefit.
3. CDP-Choline: 0.25g

You’ll want choline when using -racetams. 0.25g strikes me as low.
4. EPA/DHA: 1.2g

Fish oil is a safe bet for supplements. 1.2g is also low, I would prefer double that. (In the batch I got, there was a sort of fruity/gummy taste & aftertaste. Apparently it’s cherry-flavored.)
5. Magnesium glycinate/lycinate: 0.2g

My magnesium l-threonate correlation from the Noopept self-experiment suggested magnesium would help me, so I don’t mind seeing magnesium here as well.
6. Pramiracetam: 0.3g

I don’t know very much about pramiracetam.
7. Theanine: 0.2g

An old favorite of mine.
8. Tyrosine: 0.35g

Like ALCAR, did nothing subjectively noticeable for me, but nothing bad either.

The packaging is nice, if a little confusing (it’s not entirely clear what packets are supposed to be taken on the initial days as part of the “loading”). The pills are swallowable (one takes a set with breakfast and a second set with lunch). I do not seem to have died or gone into untoward states like seizures, and the first day went swimmingly.

# Tryptophan

l-Tryptophan is in a sense redundant with taking melatonin, since melatonin is one of the most prominent metabolites of tryptophan. Nevertheless, subjectively I seem to sleep better by taking 1.5mg of melatonin & 0.5g of tryptophan than I do by taking, say, 3mg of melatonin.

One of the other suggested benefits is for boosting serotonin levels; low levels of serotonin are implicated in a number of issues like depression. I’m not yet sure whether tryptophan has helped with motivation or happiness. Trial and error has taught me that it’s a bad idea to take tryptophan in the morning or afternoon, however, even smaller quantities like 0.25g. Like melatonin, the dose-response curve is a U: ~1g is great and induces multiple vivid dreams for me, but ~1.5g leads to an awful night and a headache the next day that was worse, if anything, than melatonin. (One morning I woke up with traces of at least 7 dreams, although I managed to write down only 2. No lucid dreams, though.)

Taking the tryptophan is fairly difficult. The powder as supplied by Bulk Nutrition is extraordinarily dry and fine; it seems to be positively hydrophobic. The first time I tried to swallow a teaspoon, I nearly coughed it out - the power had seemed to explode in my mouth and go down my lungs. Thenceforth I made sure to have a mouth of water first. After a while, I took a different tack: I mixed in as much Hericium as would fit in the container. The mushroom powder is wetter and chunkier than the tryptophan, and seems to reduce the problem. Combining the mix with chunks of melatonin inside a pill works even better.

# Tyrosine

Tyrosine (Examine.com) is an amino acid; people on the Imminst.org forums (as well as Wikipedia) suggest that it helps with energy and coping with stress. I ordered 4oz (bought from Smart Powders) to try it out, and I began taking 1g with my usual caffeine+piracetam+choline mix. It does not dissolve easily in hot water, and is very chalky and not especially tasty. I have not noticed any particular effects from it.

# Vitamin D

Bought 5,000 IU soft-gels of Vitamin D-340 (Examine.com; FDA adverse events) because I was feeling very apathetic in January 2011 and not getting much done, even slacking on regular habits like Mnemosyne spaced repetition review or dual n-back or my Wikipedia watchlist. Introspecting, I was reminded of depression & dysthymia & seasonal affective disorder.

There are a number of treatments for the last. I already use melatonin. I sort of have light therapy from a full-spectrum fluorescent desk lamp. But I get very little sunlight; the surprising thing would be if I didn’t have a vitamin D deficiency. And vitamin D deficiencies have been linked with all sorts of interesting things like near-sightedness, with time outdoors inversely correlating with myopia and not reading or near-work time. (It has been claimed that caffeine interferes with vitamin D absorption and so people like me especially need to take vitamin D, on top of the deficits caused by our vampiric habits, but I don’t think this is true41.) Unfortunately, there’s not very good evidence that vitamin D supplementation helps with mood/SAD/depression: there’s 4 or 5 small RCTs with some findings of benefits, but no meta-analysis yet. (There is an ongoing Cochrane systematic review but it is not expected to finish until April 2014 at the earliest.) Better confirmed is reducing all-cause mortality in elderly people (see, in order of increasing comprehensiveness: Evidence Syntheses 2013, Chung et al 2009, Autier & Gandini 2007, Bolland et al 2014).

Given the involvement with circadian rhythms and the synthesis involving direct sunlight, it is likely a bad idea to take vitamin D close to bedtime, and there have been anecdotes that it damages sleep quality; I investigated this with my Zeo and concluded it seemed to be true for me.

The soft gels are very small; one needs to be a bit careful - Vitamin D is fat-soluble and overdose starts in the range of 70,000 IU42, so it would take at least 14 pills, and it’s unclear where problems start with chronic use. Vitamin D, like many supplements, follows a U-shaped response curve (see also Melamed et al 2008 and Durup et al 2012) - too much can be quite as bad as too little. Too little, though, is likely very bad. The previously cited studies with high acute doses worked out to <1,000 IU a day, so they may reassure us about the risks of a large acute dose but not tell us much about smaller chronic doses; the mortality increases due to too-high blood levels begin at ~140nmol/l and reading anecdotes online suggest that 5k IU daily doses tend to put people well below that (around 70-100nmol/l). I probably should get a blood test to be sure, but I have something of a needle phobia.

I have elsewhere remarked on the apparent lack of benefit to taking multivitamins and the possible harm; so one might well wonder about a specific vitamin like vitamin D. However, a ‘multivitamin’ is not ‘vitamin D’, so it’s no surprise that they might do different things. If a multivitamin had no vitamin D in it, or if it had vitamin D in different doses, or if it had substances which interacted with vitamin D (such as calcium), or if it had substances which had negative effects which outweigh the positive (such as vitamin A?), we could well expect differing results. In this case, all of those are true to varying extents. Some multivitamins I’ve had contained no vitamin D. The last multivitamin I was taking both contains vitamins used in the negative trials and also some calcium; the listed vitamin D dosage was a trivial ~400IU, while I take >10x as much now (5000IU).

10,000 IU is highly likely to be enough, and is similar to what one might get from an hour on the beach; so 5000 IU should be satisfactory.

# TODO

• Bacopa - The research looks interesting and it’s cheap; but I am suspicious of anything Ayurvedic because of heavy metals, and Bacopa monnieri is a hyperaccumulator of heavy metals.
• Naringenin - Timothy Ferriss in excerpt from Four-hour Body claims it extends effectiveness of caffeine (how to buy - capsule? grape fruit concentrate?)
• Memantine - linked with depression alleviation
• Ginseng (cf. the Cochrane Review)

# Appendices

With the more subtle nootropics, poor shopping can lead to the price per dose becoming so high that they are not cost-effective; this does not have to be the case.

This tendency is exacerbated by general inefficiencies in the nootropics market - they are manufactured for vastly less than they sell for, although the margins aren’t as high as they are in other supplement markets, and not nearly as comical as illegal recreational drugs. (Global Price Fixing: Our Customers are the Enemy (Connor 2001) briefly covers the vitamin cartel that operated for most of the 20th century, forcing food-grade vitamins prices up to well over 100x the manufacturing cost.) For example, the notorious Timothy Ferriss (of The Four-hour Work Week) advises imitators to find a niche market with very high margins which they can insert themselves into as middlemen and reap the profits; one of his first businesses specialized in… nootropics & bodybuilding. Or, when Smart Powders - usually one of the cheapest suppliers - was dumping its piracetam in a fire sale of half-off after the FDA warning, its owner mentioned on forums that the piracetam was still profitable (and that he didn’t really care because selling to bodybuilders was so lucrative); this was because while SP was selling 2kg of piracetam for ~$90, Chinese suppliers were offering piracetam on AliBaba for$30 a kilogram or a third of that in bulk. (Of course, you need to order in quantities like 30kg - this is more or less the only problem the middlemen retailers solve.) It goes without saying that premixed pills or products are even more expensive than the powders.

Powders are good for experimenting with (easy to vary doses and mix), but not so good for regular taking. I use OO gel capsules with a Capsule Machine: it’s hard to beat $20, it works, it’s not that messy after practice, and it’s not too bad to do 100 pills. However, I once did 3kg of piracetam + my other powders, and doing that nearly burned me out on ever using capsules again. If you’re going to do that much, something more automated is a serious question! (What actually wound up infuriating me the most was when capsules would stick in either the bottom or top try - requiring you to very gingerly pull and twist them out, lest the two halves slip and spill powder - or when the two halves wouldn’t lock and you had to join them by hand. In contrast: loading the gel caps could be done automatically without looking, after some experience.) ## 3 years supply in pill form (2010) Manually mixing powders is too annoying, and pre-mixed pills are expensive in bulk. So if I’m not actively experimenting with something, and not yet rich, the best thing is to make my own pills, and if I’m making my own pills, I might as well make a custom formulation using the ones I’ve found personally effective. And since making pills is tedious, I want to not have to do it again for years. 3 years seems like a good interval - 1095 days. Since one is often busy and mayn’t take that day’s pills (there are enough ingredients it has to be multiple pills), it’s safe to round it down to a nice even 1000 days. What sort of hypothetical stack could I make? What do the prices come out to be, and what might we omit in the interests of protecting our pocketbook? We omit tryptophan and melatonin, of course, because they are most useful for sleeping and this is a stimulus pill for daytime usage. That leaves from the above the following, with some basic commercial specs from the usual retailers: Ingredient Dose (g) g/day Days Price Supplier aniracetam 180 1 180$50 SmartPowders.com
caffeine 400 2 200 $18 SmartPowders.com choline citrate 500 2 250$17 SmartPowders.com
creatine 1000 4 250 $17 SmartPowders.com lithium orotate 25 0.2 125$11 Amazon
modafinil 2 0.2 10 $8 United Pharmacies43 sulbutiamine 30 0.25 120$20 SmartPowders.com
theanine 20 0.1 200 $10 SmartPowders.com We calculate how many days each unit gets us simply by dose divided by dose per day. We get quite a range; with some products, we only need 4 units to cover at least 1000 days, but we need 100 units for modafinil! Ingredient Units Cost aniracetam 6$300
caffeine 5 $90 choline citrate 4$68
creatine 4 $68 lithium orotate 8$88
modafinil 100 $800 sulbutiamine 9$180
theanine 5 $50 Sum total,$1644, or $1.65 per day for the ingredients. But how many pills does this make and how much do those pills cost? Capsule Connection sells 1000 00 pills (the largest pills) for$9. I already have a pill machine, so that doesn’t count (a sunk cost). If we sum the grams per day column from the first table, we get 9.75 grams a day. Each 00 pill can take around 0.75 grams, so we need 13 pills. (Creatine is very bulky, alas.) 13 pills per day for 1000 days is 13,000 pills, and 1,000 pills is $9 so we need 13 units and 13 times 9 is$117.

Redoing the above, the total expense is $1761 or$1.76 per day.

13 pills a day sounds like a lot, and $1.76 is actually a fair amount per day compared to what most people take. If I couldn’t swing a round$1800 (even to cover years of consumption), how would I economize?

Looking at the prices, the overwhelming expense is for modafinil. It’s a powerful stimulant - possibly the single most effective ingredient in the list - but dang expensive. Worse, there’s anecdotal evidence that one can develop tolerance to modafinil, so we might be wasting a great deal of money on it. (And for me, modafinil isn’t even very useful in the daytime: I can’t even notice it.) If we drop it, the cost drops by a full $800 from$1761 to $961 (almost halving) and to$0.96 per day. A remarkable difference, and if one were genetically insensitive to modafinil, one would definitely want to remove it.

On the other metric, suppose we removed the creatine? Dropping 4 grams of material means we only need to consume 5.75 grams a day, covered by 8 pills (compared to 13 pills). We save 5,000 pills, which would have cost $45 and also don’t spend the$68 for the creatine; assuming a modafinil formulation, that drops our $1761 down to$1648 or $1.65 a day. Or we could remove both the creatine and modafinil, for a grand total of$848 or $0.85 a day, which is pretty reasonable. 1. Stewart Brand on the ’60s: …The drugs didn’t work. Or at least only for a bit. “We believed there was no hope without dope but we were wrong. I’m always amazed there aren’t drugs by now, but there aren’t. They didn’t get any better, whereas computers never stopped getting better.” 2. More than once I have seen results indicating that high-IQ types benefit the least from random nootropics; nutritional deficits are the premier example, because high-IQ types almost by definition suffer from no major deficiencies like iodine. But a stimulant modafinil may be another such nootropic (see “Cognitive effects of modafinil in student volunteers may depend on IQ”, Randall et al 2005), which mentions: Similarly, Mehta et al 2000 noted that the positive effects of methylphenidate (40 mg) on spatial working memory performance were greatest in those volunteers with lower baseline working memory capacity. In a study of the effects of ginkgo biloba in healthy young adults, Stough et al 2001 found improved performance in the Trail-Making Test A only in the half with the lower verbal IQ. 3. From “Why Aren’t We Smarter Already: Evolutionary Trade-Offs and Cognitive Enhancements”, Hills & Hertwig 2011: For illustration, consider amphetamines, Ritalin, and modafinil, all of which have been proposed as cognitive enhancers of attention. These drugs exhibit some positive effects on cognition, especially among individuals with lower baseline abilities. However, individuals of normal or above-average cognitive ability often show negligible improvements or even decrements in performance following drug treatment (for details, see de Jongh, Bolt, Schermer, & Olivier, 2008). For instance, Randall, Shneerson, and File (2005) found that modafinil improved performance only among individuals with lower IQ, not among those with higher IQ. [See also Finke et al 2010 on visual attention.] Farah, Haimm, Sankoorikal, & Chatterjee 2009 found a similar nonlinear relationship of dose to response for amphetamines in a remote-associates task, with low-performing individuals showing enhanced performance but high-performing individuals showing reduced performance. Such ∩-shaped dose-response curves are quite common (see Cools & Robbins, 2004) Among other things, these considerations warn us against expecting much from nootropics whose principal justification come from their results in the ill or the old (since we could call being old an illness) - they are already brain-damaged. 4. For example, I am have used my Zeo to measure the effects of melatonin or of double-blinded4 vitamin D on my Zeo sleep data; the latter is novel and interesting. 5. This is reportedly the result of ‘Ilieva, I., Boland, J., Chatterjee, A. & Farah, M.J. (2010). “Adderall’s perceived and actual effects on healthy people’s cognition”. Poster presented at the annual meeting of the Society for Neuroscience, San Diego, CA’; blogger Casey Schwartz describes it: …researchers have added a new layer to the “smart pill” conversation. Adderall, they’ve found, makes you think you’re doing better than you actually are….Those subjects who had been given Adderall were significantly more likely to report that the pill had caused them to do a better job….But the results of the new University of Pennsylvania study, funded by the U.S. Navy and not yet published but presented at the annual Society for Neuroscience conference last month, are consistent with much of the existing research. As a group, no overall statistically-significant improvement or impairment was seen as a result of taking Adderall. The research team tested 47 subjects, all in their 20s, all without a diagnosis of ADHD, on a variety of cognitive functions, from working memory-how much information they could keep in mind and manipulate-to raw intelligence, to memories for specific events and faces….The last question they asked their subjects was: “How and how much did the pill influence your performance on today’s tests?” Those subjects who had been given Adderall were significantly more likely to report that the pill had caused them to do a better job on the tasks they’d been given, even though their performance did not show an improvement over that of those who had taken the placebo. According to Irena Ilieva…it’s the first time since the 1960s that a study on the effects of amphetamine, a close cousin of Adderall, has asked how subjects perceive the effect of the drug on their performance. 6. Much better than I had expected. One of the best superhero movies so far, better than Thor or Watchmen (and especially better than the Iron Man movies). I especially appreciated how it didn’t launch right into the usual hackneyed creation of the hero plot-line but made Captain America cool his heels performing & selling war bonds for 10 or 20 minutes. The ending left me a little nonplussed, although I sort of knew it was envisioned as a franchise and I would have to admit that showing Captain America wondering at Times Square is much better an ending than something as cliche as a close-up of his suddenly-opened eyes and then a fade out. (The movie continued the lamentable trend in superhero movies of having a strong female love interest… who only gets the hots for the hero after they get muscles or powers. It was particularly bad in CA because she knows him and his heart of gold beforehand! What is the point of a feminist character who is immediately forced to do that?) 7. With just 16 predictions, I can’t simply bin the predictions and say “yep, that looks good”. Instead, we can treat each prediction as equivalent to a bet and see what my winnings (or losses) were; the standard such proper scoring rule is the logarithmic rule which pretty simple: you ‘earn’ the logarithm of the probability if you were right, and the logarithm of the negation if you were wrong; he who racks up the fewest negative points wins. We feed in a list and get back a number: logScore ps = sum$ map (\(result,p) -> if result then log p else log (1-p)) ps
logScore [(True,0.95),(False,0.30),(True,0.85),(True,0.75),(False,0.50),(False,0.25),
(False,0.60),(True,0.70),(True,0.65),(True,0.60),(False,0.30),(True,0.50),
(True,0.90),(True,0.40)]
~> -6.125

In this case, a blind guesser would guess 50% every time (roughly half the days were Adderall and roughly half were not) so the question is, did the 50% guesser beat me?

logScore [(True,0.5),(False,0.5),(True,0.5),(True,0.5),(False,0.5),
(False,0.5),(False,0.5),(True,0.5),(True,0.5),(True,0.5),
(False,0.5),(True,0.50),(True,0.5),(True,0.5)]
~> -9.7
(-9.7) > logScore [(True,0.95),(False,0.30),(True,0.85),(True,0.75),(False,0.50),
(False,0.25),(False,0.60),(True,0.70),(True,0.65),(True,0.60),
(False,0.30),(True,0.50),(True,0.90),(True,0.40)]
~> False

We can also express this as a single function by using a base-2 log (higher numbers are better):

logBinaryScore = sum . map (\(result,p) -> if result then 1 + logBase 2 p else 1 + logBase 2 (1-p))
logBinaryScore [(True,0.95),(False,0.30),(True,0.85),(True,0.75),(False,0.50),(False,0.25),
(False,0.60),(True,0.70),(True,0.65),(True,0.60),(False,0.30),(True,0.50),
(True,0.90),(True,0.40)]
~> 5.16

So I had a palpable edge over the random guesser, although the sample size is not fantastic.

8. For example, Alexander Shulgin’s famous PiHKAL book on derivatives of PEA comments on PEA proper that:

• (with 200, 400, 800 and 1600 mg) “No effects.”
• (with 500 mg) “No effects.”
• (with 800 and 1600 mg) “No effects.”
• (with 25 and 50 mg i.v.) “No effects.”

…It is without activity in man! Certainly not for the lack of trying, as some of the dosage trials that are tucked away in the literature (as abstracted in the “Qualitative Comments” given above) are pretty heavy duty. Actually, I truly doubt that all of the experimenters used exactly that phrase, “No effects”, but it is patently obvious that no effects were found. It happened to be the phrase I had used in my own notes.

…Phenethylamine is intrinsically a stimulant, although it doesn’t last long enough to express this property. In other words, it is rapidly and completely destroyed in the human body. It is only when a number of substituent groups are placed here or there on the molecule that this metabolic fate is avoided and pharmacological activity becomes apparent.

9. The abuse liability of caffeine has been evaluated.147,148 Tolerance development to the subjective effects of caffeine was shown in a study in which caffeine was administered at 300 mg twice each day for 18 days.148 Tolerance to the daytime alerting effects of caffeine, as measured by the MSLT, was shown over 2 days on which 250 g of caffeine was given twice each day48 and to the sleep-disruptive effects (but not REM percentage) over 7 days of 400 mg of caffeine given 3 times each day.7 In humans, placebo-controlled caffeine-discontinuation studies have shown physical dependence on caffeine, as evidenced by a withdrawal syndrome.147 The most frequently observed withdrawal symptom is headache, but daytime sleepiness and fatigue are also often reported. The withdrawal-syndrome severity is a function of the dose and duration of prior caffeine use…At higher doses, negative effects such as dysphoria, anxiety, and nervousness are experienced. The subjective-effect profile of caffeine is similar to that of amphetamine,147 with the exception that dysphoria/anxiety is more likely to occur with higher caffeine doses than with higher amphetamine doses. Caffeine can be discriminated from placebo by the majority of participants, and correct caffeine identification increases with dose.147 Caffeine is self-administered by about 50% of normal subjects who report moderate to heavy caffeine use. In post-hoc analyses of the subjective effects reported by caffeine choosers versus nonchoosers, the choosers report positive effects and the nonchoosers report negative effects. Interestingly, choosers also report negative effects such as headache and fatigue with placebo, and this suggests that caffeine-withdrawal syndrome, secondary to placebo choice, contributes to the likelihood of caffeine self-administration. This implies that physical dependence potentiates behavioral dependence to caffeine.

10. “Flavonoids and cognitive function: a review of human randomized controlled trial studies and recommendations for future studies”

Evidence in support of the neuroprotective effects of flavonoids has increased significantly in recent years, although to date much of this evidence has emerged from animal rather than human studies. Nonetheless, with a view to making recommendations for future good practice, we review 15 existing human dietary intervention studies that have examined the effects of particular types of flavonoid on cognitive performance. The studies employed a total of 55 different cognitive tests covering a broad range of cognitive domains. Most studies incorporated at least one measure of executive function/working memory, with nine reporting significant improvements in performance as a function of flavonoid supplementation compared to a control group. However, some domains were overlooked completely (e.g. implicit memory, prospective memory), and for the most part there was little consistency in terms of the particular cognitive tests used making across study comparisons difficult. Furthermore, there was some confusion concerning what aspects of cognitive function particular tests were actually measuring. Overall, while initial results are encouraging, future studies need to pay careful attention when selecting cognitive measures, especially in terms of ensuring that tasks are actually sensitive enough to detect treatment effects.

11. The abstract:

Cocoa flavanols (CF) positively influence physiological processes in ways which suggest that their consumption may improve aspects of cognitive function. This study investigated the acute cognitive and subjective effects of CF consumption during sustained mental demand. In this randomized, controlled, double-blinded, balanced, three period crossover trial 30 healthy adults consumed drinks containing 520 mg, 994 mg CF and a matched control, with a 3-day washout between drinks. Assessments included the state anxiety inventory and repeated 10-min cycles of a Cognitive Demand Battery comprising of two serial subtraction tasks (Serial Threes and Serial Sevens), a Rapid Visual Information Processing (RVIP) task and a ‘mental fatigue’ scale, over the course of 1 h. Consumption of both 520 mg and 994 mg CF significantly improved Serial Threes performance. The 994 mg CF beverage significantly speeded RVIP responses but also resulted in more errors during Serial Sevens. Increases in self-reported ‘mental fatigue’ were significantly attenuated by the consumption of the 520 mg CF beverage only. This is the first report of acute cognitive improvements following CF consumption in healthy adults. While the mechanisms underlying the effects are unknown they may be related to known effects of CF on endothelial function and blood flow.

12. If we assume the variance of the daily scores are equal and we exclude the hypothesis that fish oil might make scores worse, then we get a smaller p-value:

before <- c(54,69,42,54,44,62,44,35,85,50,44,42,57,65,51,56,42,53,40,47,
45,51,57,57,56,76,66,60,46,52,59,48,28,45,43,47,50,40,57,46,33,19,43,58,36,52,44,64)
after <- c(55,76,56,55,44,41,44,45,65,70,46,65,46,52,68,52,57,50,64,43,
41,50,69,44,47,63,34,57)

wilcox.test(before,after,alternative="less")

Wilcoxon rank sum test with continuity correction

data:  before and after
W = 570.5, p-value = 0.1381
alternative hypothesis: true location shift is less than 0

(mean(after) - mean(before)) / sd(append(before,after)) # the effect size
0.28

A Bayesian MCMC analysis using the BEST library gives a similar answer - too much overlap, not enough data:

$sudo apt-get install jags r-cran-rjags$ R
install.packages("rjags")
before <- c(54,69,42,54,44,62,44,35,85,50,44,42,57,65,51,56,42,53,40,47,
45,51,57,57,56,76,66,60,46,52,59,48,28,45,43,47,50,40,57,46,33,19,43,58,36,52,44,64)
after <- c(55,76,56,55,44,41,44,45,65,70,46,65,46,52,68,52,57,50,64,43,41,50,69,44,47,63,34,57)
mcmcChain = BESTmcmc(before, after)
postInfo = BESTplot(before, after, mcmcChain) # the generated image
show(postInfo)
SUMMARY.INFO
PARAMETER         mean     median       mode     HDIlow    HDIhigh pcgtZero
mu1       50.1419390 50.1377127 50.1913377 46.8630997 53.6056828       NA
mu2       53.3331611 53.3335072 53.4984856 49.0140883 57.5923759       NA
muDiff    -3.1912221 -3.1790710 -2.8965497 -8.6114644  2.2571314 12.11276
sigma1    11.1989483 11.1365632 11.0708164  8.3699263 14.0987125       NA
sigma2    10.7999759 10.6280744 10.3198861  7.7835957 14.2214647       NA
sigmaDiff  0.3989724  0.4697451  0.5809042 -3.8825471  4.5266108 59.15182
nu        31.2485911 22.6401577  9.1936838  2.3043610 86.5712602       NA
nuLog10    1.3484496  1.3548794  1.3570830  0.6442172  2.0117475       NA
effSz     -0.2917182 -0.2898252 -0.2621231 -0.7942141  0.1909223 12.11276
13. From Tsaltas 2008, pg 15:

Tentative conclusions from studies in normal subjects are that acute lithium does not affect short-term memory; subchronic administration spares basic short-term memory of ongoing events but higher task demands (as in neuropsychological testing) occasionally reveal mild deficits. As do learning deficits, these too appear transient. A similar picture emerges with respect to lithium effects on human long-term recall. In animal studies, subchronic and chronic lithium with clinically relevant serum levels does not affect spatial reference or object recognition memory and actually enhances working memory under certain conditions. This is consistent with recent clinical MRI findings noting improved immediate verbal memory after a 4-year period of lithium treatment, along with MRI evidence of increased hippocampal volume over the same period.

Human attention is quite consistently reported normal under lithium. Some older animal studies report narrowing of attention onto high-salience cues and compromised latent inhibition, but these results are challenged by more recent data indicating normal function. Finally, information on lithium effects on executive functions is sparse and cannot be evaluated at present. More basic research is definitely needed with respect to lithium effects on attention and executive functions. Recent reports on lithium effects on the cognitive-behavioral deficits induced by various challenges to the nervous system in animal models are quite promising. Lithium protects against neuroanatomical and neurochemical effects and also moderates cognitive deficits induced by stress or CNS trauma such as irradiation or anoxia. In some cases, such deficits are not simply prevented but appear to be reversed post facto. This combined neuroprotective- and cognitive-enhancing action of lithium is noted primarily with respect to hippocampally related spatial memory tasks. It appears to involve protection against the reduced cell proliferation and increased apoptotic rate noted mainly in the hippocampus under these challenges…

14. Tsaltas 2008, continued:

A similar picture emerges in relation to lithium effects on the cognitive compromises induced by neurodegenerative disorders. Lithium reduces the prevalence of Alzheimer’s disease in bipolar patients, and there is evidence suggesting that this is associated with reduced GSK-3beta expression. Evidence of lithium’s moderating action on hippocampally related cognitive deficits also comes from transgenic animal models of Alzheimer’s disease…In cognitive dysfunction associated with psychiatric conditions, beneficial effects of lithium have emerged on the neuroanatomical level from imaging studies. Lithium treatment of bipolar patients has been associated with hippocampal volume increase and appears to entail concomitant cognitive improvements. These neuroimaging findings are not limited to bipolar patients, but involve people at ultrahigh risk of developing a psychotic disorder where lithium appears to arrest neuroanatomical and neurochemical changes associated with the onset of psychosis. In conclusion, increasing neuroanatomical and neurochemical evidence from both in vitro and in vivo studies supports that lithium has neuroprotective properties, mainly involving hippocampal cells (Moore et al. 2000; Manji et al. 2001; Sassi et al. 2002; Kim et al. 2004; Chuang 2004; Chuang and Priller 2006).

15. Two earlier studies: “The mathematical relationship of drinking water lithium and rainfall to mental hospital admission” & “Relationship of lithium metabolism to mental hospital admission and homicide” (which used directly measured lithium levels via urine samples).

16. Informally, the chemist William Walsh found by 1983 that among his other results from hair analysis, lithium was low in his studied inmates as well. Some studies cite an unpublished Walsh manuscript, “Chemical imbalance and criminal violence: results of two controlled studies of California institutions”, held at the “Health Res. Institute, Chicago”.

17. Kabacs et al 2011 turns in the expected negative point value (r = -0.03), but it is not statistically-significant. It’s not clear how much of a counter-example this is; the correlation is simple without any adjustments for other factors (like Kapusta et al 2011 did), and there’s an issue of range restriction: the authors write “In the East of England, there was relatively little variation in population size across the 47 subdivisions. Also, the lithium levels in drinking water in Texas and in the Oita prefecture ranged from 0 to 160 μg/l, and 0.7 to 59 μg/l, respectively. These values represent a much wider range and higher top level than those found in the East of England (<1-21 μg/l).”

18. Tsaltas et al 2008, pg 15:

The effects of lithium on learning in clinical populations appear to be mildly detrimental, possibly attributable to lithium’s generalized dampening effect on performance. They appear most pronounced in the initial stages of lithium administration, as corroborated by animal studies. Therefore, results produced by subchronic regimes should be treated cautiously, as perhaps reflecting general influences on arousal and mood.

19. This metric is a little troubling since working memory is trainable and that’s the point of dual n-back - but my own scores have been stagnant for a long time and the blocking should reduce the impact of any very slow linear growth in scores.

20. That is, perhaps light of the right wavelength can indeed save the brain some energy by making it easier to generate ATP. Would 15 minutes of LLLT create enough ATP to make any meaningful difference, which could possibly cause the claimed benefits? The problem here is like that of the famous blood-glucose theory of willpower - while the brain does indeed use up more glucose while active, high activity uses up very small quantities of glucose/energy which doesn’t seem like enough to justify a mental mechanism like weak willpower.

21. Kurzban, in a blog post puts it well:

In my last post, I talked about the idea that there is a resource that is necessary for self-control…I want to talk a little bit about the candidate for this resource, glucose. Could willpower fail because the brain is low on sugar? Let’s look at the numbers. A well-known statistic is that the brain, while only 2% of body weight, consumes 20% of the body’s energy. That sounds like the brain consumes a lot of calories, but if we assume a 2,400 calorie/day diet - only to make the division really easy - that’s 100 calories per hour on average, 20 of which, then, are being used by the brain. Every three minutes, then, the brain - which includes memory systems, the visual system, working memory, then emotion systems, and so on - consumes one (1) calorie. One. Yes, the brain is a greedy organ, but it’s important to keep its greediness in perspective… Suppose, for instance, that a brain in a person exerting their willpower - resisting eating brownies or what have you - used twice as many calories as a person not exerting willpower. That person would need an extra one third of a calorie per minute to make up the difference compared to someone not exerting willpower. Does exerting “self control” burn more calories?

• Clarke and Sokoloff (1998) remarked that although “[a] common view equates concentrated mental effort with mental work…there appears to be no increased energy utilization by the brain during such processes” (p. 664), and “…the areas that participate in the processes of such reasoning represent too small a fraction of the brain for changes in their functional and metabolic activities to be reflected in the energy metabolism of the brain…” (p. 675).
• Gibson and Green (2002), talking about a possible link between glucose and cognition, wrote that research in the area “…is based on the assumption that, since glucose is the major source of fuel for the brain, alterations in plasma levels of glucose will result in alterations in brain levels of glucose, and thus neuronal function. However, the strength of this notion lies in its common-sense plausibility, not in scientific evidence…” (p. 185).
• Lennie (2003) concluded that “[t]he brain’s energy consumption does not change with normal variations in mental activity” and that “overall energy consumption is essentially constant” (p. 495).
• Messier (2004) concluded that it is “unlikely that the blood glucose changes observed during and after a difficult cognitive task are due to increased brain glucose uptake” (p. 39).
• Gibson (2007), concluded that “task-induced changes in human peripheral blood glucose are unlikely to reflect changes in relevant areas of brain glucose supply” (p. 75).
22. And in his followup work, “An opportunity cost model of subjective effort and task performance” (discussion). Kurzban seems to have successfully refuted the blood-glucose theory, with few dissenters from commenting researchers. The more recent opinion seems to be that the sugar interventions serve more as a reward-signal indicating more effort is a good idea, not refueling the engine of the brain (which would seem to fit well with research on procrastination).

23. “The kidneys are crucial in magnesium homeostasis [18, 49–51] as serum magnesium concentration is primarily controlled by its excretion in urine [7]. Magnesium excretion follows a circadian rhythm, with maximal excretion occurring at night [15].” –Magnesium Basics

24. This calculation - reaping only $\frac{7}{9}$ of the naive expectation - gives one pause. How serious is the sleep rebound? In another article, I point to a mice study that sleep deficits can take 28 days to repay. What if the gain from modafinil is entirely wiped out by repayment and all it did was defer sleep? Would that render modafinil a waste of money? Perhaps. Thinking on it, I believe deferring sleep is of some value, but I cannot decide whether it is a net profit.

That it is somewhat valuable is clear if we consider it under another guise. Imagine you received the same salary you do, but paid every day. Accounting systems would incur considerable costs handling daily payments, since they would be making so many more and so much smaller payments, and they would have to know instantly whether you showed up to work that day and all sorts of other details, and the recipients themselves would waste time dealing with all these checks or looking through all the deposits to their account, and any errors would be that much harder to track down. (And conversely, expensive ‘payday loans’ are strong evidence that for poor people, a bi-weekly payment is much too infrequent.) One might draw a comparison to batching or buffers in computers: by letting data pile up in buffers, the computer can then deal with them in one batch, amortizing overhead over many items rather than incurring the overhead again and again. The downside, of course, is that latency will suffer and performance may drop based on that or the items becoming outdated & useless. The right trade-off will depend on the specifics; one would not expect random buffer-sizes to be optimal, but one would have to test and see what works best.

25. As before in the Adderall trial, we use a binary logarithmic proper scoring rule:

logBinaryScore = sum . map (\(result,p) -> if result then 1 + logBase 2 p else 1 + logBase 2 (1-p))
logBinaryScore [(True,0.40),(True,0.50),(False,0.65),(False,0.50),
(True,0.75),(False,0.40),(False,0.35),(False,0.60)]
~> 0.007

Compare 0.007 to the 5.16 I racked up guessing Adderall! My score is essentially 0.

26. I don’t understand how Sun can produce any armodafinil, as the armodafinil patents are recent enough that the modafinil loophole shouldn’t apply.

27. From slide 6 in the second link:

Kinetic Profiles (Darwish et al.) [Darwish et al 2009, “Armodafinil and Modafinil have substantially different pharmacokinetic profiles despite having the same terminal half-lives”]

• S-modafinil has a relatively short half-life (4-5 hours)
• R-modafinil has a 3-4 fold longer half-life (~15 hours)
• R-modafinil has 43% higher concentrations 7-11 hours after dosing
• Greater systemic exposure to R-modafinil; AUC∞ was 40% higher
• R-modafinil’s plasma fluctuation was 28% less than S-modafinil over 24-hours
• More linear, monophasic elimination of R-modafinil"

Slide 8:

“Patients report a more profound & sustained”wakefulness" with armodafinil.

Slightly better side-effect profile?*

• Slightly less incidence of headache/anxiety
• Longer lasting armodafinil = more insomnia?
• Reduced “medication-load” on the body, since it does not have to metabolize S-modafinil.

*Doses compared may influence the reliability of this data (400mg modafinil vs 250mg armodafinil)

29. This was using Brain Workshop, D5B, 45 trials over 157 seconds.

30. “Cognitive effects of nicotine in humans: an fMRI study”, Kumari et al 2003

…Four subjects correctly stated when they received nicotine, five subjects were unsure, and the remaining two stated incorrectly which treatment they received on each occasion of testing. These numbers are sufficiently close to chance expectation that even the four subjects whose statements corresponded to the treatments received may have been guessing.

31. On the Quantified Self forum, Christian Kleineidam asked:

As I see you didn’t control for the training effect of dual-n-back. Are your dual-n-back scores generally stable enough that you don’t have a strong training effect anymore?

I don’t believe there’s any need to control for training with repeated within-subject sampling, since there will be as many samples on both control and active days drawn from the later “trained” period as with the initial “untrained” period. But yes, my D5B scores seem to have plateaued pretty much and only very slowly increase; you can look at the stats file yourself.

But to investigate, let’s look a graph of my last ~200 D5B scores:

dnb <- c(30,34,41,45,44,33,30,38,48,52,37,50,45,30,53,46,50,25,20,52,40,54,36,58,10,32,
33,36,43,36,41,29,40,29,28,36,25,27,38,50,25,34,30,40,57,34,41,51,36,26,34,62,
33,22,40,28,37,50,25,37,42,40,45,31,24,38,40,47,42,44,58,47,55,35,31,27,66,25,
38,35,43,60,47,17,43,46,50,36,38,58,50,23,50,31,38,33,66,30,68,42,40,29,69,45,
60,37,22,28,40,41,45,37,18,50,20,41,42,47,44,60,31,46,46,55,47,42,35,40,45,27,
35,45,30,29,47,56,37,50,44,40,33,44,19,58,38,41,52,41,33,47,45,45,55,20,31,42,
53,27,45,50,65,33,33,30,52,36,28,43,33,40,47,41,25,55,40,31,30,45,50,20,25,30,
70,45,50,27,29,55,47,47,42,40,35,45,60,37,22,38,36,54,64,25,28,31,15,47,64,35,
33,60,38,28,60,45,64,50,44,38,50,42,31,50,30,35,61,56,30,44,37,43,38)

The point about randomization is key, BTW, because the theoretical training effect is actually greater than the observed improvement between randomized days. Watch:

lm(dnb ~ c(1:231))

Call:
lm(formula = dnb ~ c(1:231))

Coefficients:
(Intercept)     c(1:231)
38.37041      0.01752
# 0.017 is a positive slope!

It’s not much of a slope but it’s there. Now, I spent 200 rounds of n-back doing the randomized nicotine experiment, and those would be the latter 200 rounds graphed; how much of an improvement should I expect?

The model is: $y=38.37041+0.01752×x$. We want the endpoint, score 231, and what is 200 before 231? 31:

(38.37041 + 0.01752*231) - (38.37041 + 0.01752*31)
3.504

Notice that 3.5 > 1.1. So if this was just training effect, why isn’t the “benefit” from nicotine greater?

32. The full series:

28,61,36,25,61,57,39,56,23,37,24,50,54,32,50,33,16,42,41,40,34,33,31,65,23,36,29,51,46,31,45,52,30, 50,29,36,57,60,34,48,32,41,48,34,51,40,53,73,56,53,53,57,46,50,35,50,60,62,30,60,48,46,52,60,60,48, 47,34,50,51,45,54,70,48,61,43,53,60,44,57,50,50,52,37,55,40,53,48,50,52,44,50,50,38,43,66,40,24,67, 60,71,54,51,60,41,58,20,28,42,53,59,42,31,60,42,58,36,48,53,46,25,53,57,60,35,46,32,26,68,45,20,51, 56,48,25,62,50,54,47,42,55,39,60,44,32,50,34,60,47,70,68,38,47,48,70,51,42,41,35,36,39,23,50,46,44,56,50,39

33. That study is also interesting for finding benefits to chronic piracetam+choline supplementation in the mice, which seems connected to a Russian study which reportedly found that piracetam (among other more obscure nootropics) increased secretion of BDNF in mice. See also Drug heuristics on a study involving choline supplementation in pregnant rats.

34. Graphing each time period:

pone <- c(4,3,4,3,4,3,4,4,3,3,2,3,2,4,4,3,4,2,3,4,2,3,3,2,2,2,3,2,3,3,4,2,3,4,3,4,3)
poff <- c(3,2,2,3,4,4,3,4,2,2,3,2,3,2,2,2,4,3,3)
ptwo <- c(4,2,2,3,3,3,4,4,3,2,3,2,2,2,3,3,3,4,3,4,3,3,3,2,2,3,3,3,4,4,3,2,2,2,3,3)

plot(1:92, rep(3, 92), type="n", ylab="mood/productivity (1-4)", xlab="days")
points(1:37, pone, col="blue")
points(38:56, poff, col="red")
points(57:92, ptwo, col="blue")
35. The usual:

source("BEST.R")
mcmcChain = BESTmcmc(poff, c(pone, ptwo))
postInfo = BESTplot(poff, c(pone, ptwo), mcmcChain); postInfo
SUMMARY.INFO
PARAMETER       mean   median     mode  HDIlow  HDIhigh pcgtZero
mu1        2.78153  2.78130  2.77061  2.3832   3.1752       NA
mu2        2.98579  2.98566  2.98369  2.8103   3.1606       NA
muDiff    -0.20426 -0.20463 -0.21982 -0.6315   0.2316    17.07
sigma1     0.83778  0.81619  0.78042  0.5665   1.1559       NA
sigma2     0.73900  0.73476  0.73031  0.6158   0.8690       NA
sigmaDiff  0.09877  0.08114  0.05378 -0.2103   0.4443    70.61
nu        50.19929 42.00024 28.00379  5.8283 115.9430       NA
nuLog10    1.61236  1.62325  1.63557  1.0515   2.1480       NA
effSz     -0.26083 -0.26144 -0.28521 -0.7992   0.2774    17.07
36. We do a one-tailed test because the original hypothesis was that M/P would fall, certainly not that it would increase:

wilcox.test(poff,c(pone,ptwo), alternative="less")

Wilcoxon rank sum test with continuity correction

data:  poff and c(pone, ptwo)
W = 593, p-value = 0.1502
37. One might expect some sort of catch - surely there’s a massive quality difference to go with the massive price difference? But there could well not be; I would not be surprised to learn that the dog selegiline and the human selegiline came out of the same vat.

It’s basic economics: the price of a good must be greater than cost of producing said good, but only under perfect competition will price = cost. Otherwise, the price is simply whatever maximizes profit for the seller. (Bottled water doesn’t really cost $2 to produce.) This can lead to apparently counter-intuitive consequences involving price discrimination & market segmentation - such as ‘damaged’ goods which are the premium product which has been deliberately degraded and sold for less (some Intel CPUs, some headphones etc.). The most famous examples were railroads; one notable passage by French engineer-economist Jules Dupuit describes the motivation for the conditions in 1849: It is not because of the few thousand francs which would have to be spent to put a roof [!] over the third-class carriages or to upholster the third-class seats that some company or other has open carriages with wooden benches. What the company is trying to do is to prevent the passengers who can pay the second class fare from traveling third class; it hits the poor, not because it wants to hurt them, but to frighten the rich. And it is again for the same reason that the companies, having proved almost cruel to the third-class passengers and mean to the second-class ones, become lavish in dealing with first-class passengers. Having refused the poor what is necessary, they give the rich what is superfluous. Price discrimination is aided by barriers such as ignorance and oligopolies. An example of the former would be when I went to a Food Lion grocery store in search of spices, and noticed that there was a second selection of spices in the “Hispanic/Latino” ethnic food aisle, with unit prices perhaps a fourth of the regular McCormick-brand spices; I rather doubt that regular cinnamon varies that much in quality. An example of the latter would be using veterinary drugs on humans - any doctor to do so would probably be guilty of medical malpractice even if the drugs were manufactured in the same factories (as well they might be, considering economies of scale). Similarly, we can predict that whenever there is a veterinary drug which is chemically identical to a human drug, the veterinary drug will be much cheaper, regardless of actual manufacturing cost, than the human drug because pet owners do not value their pets more than themselves. Human drugs are ostensibly held to a higher standard than veterinary drugs; so if veterinary prices are higher, then there will be an arbitrage incentive to simply buy the cheaper human version and ‘downgrade’ them to veterinary drugs. As with any thesis, there are exceptions to this general practice. For example, theanine for dogs is sold under the brand Anxitane is sold at almost a dollar a pill, and apparently a month’s supply costs$50+ vs \$13 for human-branded theanine; on the other hand, this thesis predicts ‘downgrading’ if the market priced pet versions higher than human versions, and that Reddit poster appears to be doing just that with her dog.

38. See for example the mentions in “A rationalist’s guide to psychoactive drugs” or the discussion in the post “Coffee: When it helps, when it hurts”; see also the description of a rare bad experience with theanine.

39. It’s important one uses D-3 and not vitamin D-2, alfacalcidol, or calcitriol: the Cochrane review found mortality benefits only with D-3. (And use with calcium doesn’t look too good either.)

40. It’s been suggested that caffeine interferes with production or absorption of vitamin D and this may be a bad thing; eg. Medpedia or blogger Chris Hunt (HN discussion):

Caffeine keeps you awake, which keeps you coding. It may also be a nootropic, increasing brain-power. Both desirable results. However, it also inhibits vitamin D receptors, and as such decreases the body’s uptake of this-much-needed-vitamin. OK, that’s not so bad, you’re not getting the maximum dose of vitamin D. So what? Well, by itself caffeine may not cause you any problems, but combined with cutting off a major source of the vitamin - the production via sunlight - you’re leaving yourself open to deficiency in double-quick time.

Too much caffeine may be bad for bone health because it can deplete calcium. Overdoing the caffeine also may affect the vitamin D in your body, which plays a critical role in your body’s bone metabolism. However, the roles of vitamin D as well as caffeine in the development of osteoporosis continue to be a source of debate. Significance: Caffeine may interfere with your body’s metabolism of vitamin D, according to a 2007 “Journal of Steroid Biochemistry & Molecular Biology” study. You have vitamin D receptors, or VDRs, in your osteoblast cells. These large cells are responsible for the mineralization and synthesis of bone in your body. They create a sheet on the surface of your bones. The D receptors are nuclear hormone receptors that control the action of vitamin D-3 by controlling hormone-sensitive gene expression. These receptors are critical to good bone health. For example, a vitamin D metabolism disorder in which these receptors don’t work properly causes rickets.

The only study ever cited is “Caffeine decreases vitamin D receptor protein expression and 1,25(OH)2D3 stimulated alkaline phosphatase activity in human osteoblast cells”, Rapuri et al 2007:

Caffeine dose dependently decreased the 1,25(OH)(2)D(3) induced VDR expression and at concentrations of 1 and 10mM, VDR expression was decreased by about 50-70%, respectively. In addition, the 1,25(OH)(2)D(3) induced alkaline phosphatase activity was also reduced at similar doses thus affecting the osteoblastic function. The basal ALP activity was not affected with increasing doses of caffeine. Overall, our results suggest that caffeine affects 1,25(OH)(2)D(3) stimulated VDR protein expression and 1,25(OH)(2)D(3) mediated actions in human osteoblast cells.

One should note the serious caveats here: it is a small in vitro study of a single category of human cells with an effect size that is not clear on a protein which feeds into who-knows-what pathways. It is not a result in a whole organism on any clinically meaningful endpoint, even if we take it at face-value (many results never replicate). A look at followup work citing Rapuri et al 2007 is not encouraging: Google Scholar lists no human studies of any kind, much less high-quality studies like RCTs; just some rat followups on the calcium effect. This is not to say Rapuri et al 2007 is a bad study, just that it doesn’t bear the weight people are putting on it: if you enjoy caffeine, this is close to zero evidence that you should reduce or drop caffeine consumption; if you’re taking too much caffeine, you already have plenty of reasons to reduce; if you’re drinking lots of coffee, you already have plenty of reasons to switch to tea; etc.

If we go looking for meaningful human studies, what we find is that there’s clear evidence that caffeine damages bone density via calcium uptake, especially in old women, but there is little or no interaction between vitamin D and caffeine, and some reports of correlations entirely opposite the claimed correlation.

• Results: Women with high caffeine intakes had significantly higher rates of bone loss at the spine than did those with low intakes (−1.90 ± 0.97% compared with 1.19 ± 1.08%; P = 0.038). When the data were analyzed according to VDR genotype and caffeine intake, women with the tt genotype had significantly (P = 0.054) higher rates of bone loss at the spine (−8.14 ± 2.62%) than did women with the TT genotype (−0.34 ± 1.42%) when their caffeine intake was >300 mg/d…In 1994, Morrison et al (22) first reported an association between vitamin D receptor gene (VDR) polymorphism and BMD of the spine and hip in adults. After this initial report, the relation between VDR polymorphism and BMD, bone turnover, and bone loss has been extensively evaluated. The results of some studies support an association between VDR polymorphism and BMD (23-,25), whereas other studies showed no evidence for this association (26,27)…At baseline, no significant differences existed in serum parathyroid hormone, serum 25-hydroxyvitamin D, serum osteocalcin, and urinary N-telopeptide between the low- and high-caffeine groups (Table 1⇑). In the longitudinal study, the percentage of change in serum parathyroid hormone concentrations was significantly lower in the high-caffeine group than in the low-caffeine group (Table 2⇑). However, no significant differences existed in the percentage of change in serum 25-hydroxyvitamin D

• In simple and multiple regression analyses, the only significant variable that affected Ad-SOS and nutrient intake was vitamin D (p<0.0001). Phalangeal bone Ad-SOS was influenced only by the intake of vitamin D, not of caffeine or other nutrients.

• In this large population-based cohort, we saw consistent robust associations between cola consumption and low BMD in women. The consistency of pattern across cola types and after adjustment for potential confounding variables, including calcium intake, supports the likelihood that this is not due to displacement of milk or other healthy beverages in the diet. The major differences between cola and other carbonated beverages are caffeine, phosphoric acid, and cola extract. Although caffeine likely contributes to lower BMD, the result also observed for decaffeinated cola, the lack of difference in total caffeine intake across cola intake groups, and the lack of attenuation after adjustment for caffeine content suggest that caffeine does not explain these results. A deleterious effect of phosphoric acid has been proposed (26). Cola beverages contain phosphoric acid, whereas other carbonated soft drinks (with some exceptions) do not.

• Compared with those reporting no use, subjects drinking >4 cups/day of decaffeinated coffee were at increased risk of RA [rheumatoid arthritis] (RR 2.58, 95% CI 1.63-4.06). In contrast, women consuming >3 cups/day of tea displayed a decreased risk of RA (RR 0.39, 95% CI 0.16-0.97) compared with women who never drank tea. Caffeinated coffee and daily caffeine intake were not associated with the development of RA.

• see also “Vitamin D intake is inversely associated with rheumatoid arthritis: results from the Iowa Women’s Health Study”, Merlino et al 2004
• Since coffee drinking may lead to a worsening of calcium balance in humans, we studied the serial changes of serum calcium, PTH, 1,25-dihydroxyvitamin D (1,25(OH)2D) [vitamin D] and calcium balance in young and adult rats after daily administration of caffeine for 4 weeks. In the young rats, there was an increase in urinary calcium and endogenous fecal calcium excretion after four days of caffeine administration that persisted for the duration of the experiment. Serum calcium decreased on the fourth day of caffeine administration and then returned to control levels. In contrast, the serum PTH and 1,25(OH)2D remained unchanged initially, but increased after 2 weeks of caffeine administration…In the adult rat group, an increase in the urinary calcium and endogenous fecal calcium excretion and serum levels of PTH was found after caffeine administration. However, the serum 1,25(OH)2D levels and intestinal absorption coefficient of calcium remained the same as in the adult control group.

• “Vitamin D Receptor Genotype and the Risk of Bone Fractures in Women”, Feskanich et al 1998:

The addition of body mass index, physical activity, calcium intake, and alcohol consumption to the regression model raised the effect estimate slightly. The further addition of vitamin D, protein, and caffeine intakes had little effect on the results.

• “Tea and coffee consumption in relation to vitamin D and calcium levels in Saudi adolescents”, Al-Othman et al 2012 (emphasis added):

A total of 330 randomly selected Saudi adolescents were included. Anthropometrics were recorded and fasting blood samples were analyzed for routine analysis of fasting glucose, lipid levels, calcium, albumin and phosphorous. Frequency of coffee and tea intake was noted. 25-hydroxyvitamin D levels were measured using enzyme-linked immunosorbent assays…Vitamin D levels were significantly highest among those consuming 9-12 cups of tea/week in all subjects (p-value 0.009) independent of age, gender, BMI, physical activity and sun exposure.

41. Although there have been large trials with the elderly using much higher Vitamin D doses, such as 4 doses every year of 100,000 IU, or a single annual dose of up to 300,000 IU without observed problems.