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.)

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 (; it seemed to work well when I used it before with oxiracetam & piracetam, since I had no piracetam headaches, and be considerably less bulky.
Artichoke + Forskolin: There is plenty of evidence that suggests artichoke extract supplements (made from the leaves of artichokes) offer strong neural antioxidant properties. Additionally, Forskolin (Coleus forskohlii) is one of the few studied compounds known to naturally boost cAMP (Cyclic Adenosine Monophosphate) in your brain and is also important for neural signaling within brain cells (291m 292). I’ve experienced noticeably enhanced memory and word recall when consuming this combo. Tim Ferriss talked about this one a bit in my podcast with him, particularly referencing its presence in the somewhat popular cognition supplement “CILTEP”. Made primarily from artichoke extracts and forskolin, CILTEP is a stack that also contains vitamin B6, L-phenylalanine and acetyl-L-carnitine.  It is recommended to take two to three capsules at the beginning of each day and to skip dosage one or two days per week to achieve optimal results.
There are many books about nutrition and cognitive functions. The authors ground their nutrition protocol on what humans ate during the paleolithic era. Often these authors contradict each other. For some, we were better hunters than gatherers so we ate mostly meat. For others, we were better gatherers and ate primarily nuts, plants, fruits. Others advance our digestive system can’t tolerate grains because it was a modern invention of the first agricultural revolution (about 10,000 years ago).
The use of cognition-enhancing drugs by healthy individuals in the absence of a medical indication spans numerous controversial issues, including the ethics and fairness of their use, concerns over adverse effects, and the diversion of prescription drugs for nonmedical uses, among others.[1][2] Nonetheless, the international sales of cognition-enhancing supplements exceeded US$1 billion in 2015 when global demand for these compounds grew.[3]