The short version
- In a laboratory analysis of 10 over-the-counter cognitive-enhancement supplements, chemists detected five unapproved drugs — omberacetam, aniracetam, phenibut, vinpocetine and picamilon — and 75% of the quantities declared on labels were inaccurate.
- One product supplied up to 40.6mg of omberacetam per recommended serving against a typical pharmacological dose of 10mg, and some detected drugs were not listed on the label at all.
- Of 23 US supplements labelled as containing vinpocetine, 17 actually contained it, in amounts ranging from 0.3mg to 32mg per recommended daily serving.
- The word nootropic was coined by Corneliu Giurgea in 1972 as a pharmacological category and today carries no legal definition or evidence threshold in the United States.
- In 2024 the European Food Safety Authority reviewed 21 human intervention studies on creatine and cognition and concluded that a cause-and-effect relationship has not been established.
Ten supplements sold to improve memory went to a laboratory at the University of Mississippi. The chemists were hunting four drugs — omberacetam, aniracetam, phenylpiracetam and oxiracetam — none approved for human use in the United States. They found two of them, and three more nobody had gone looking for: phenibut, vinpocetine and picamilon.
Several of the drugs they detected were not declared on the label. Several drugs that were declared on the label were not in the product. Of the labels that gave a quantity, 75% of those quantities were wrong. One product delivered up to 40.6mg of omberacetam per recommended serving; the typical pharmacological dose is 10mg. A consumer following the instructions on a single bottle could take as many as four unapproved drugs at up to four times a pharmaceutical dose, with no clinician anywhere in the process.
That is what the word can mean at the bottom of the market. It did not start there.
1972, when the word meant something specific
The term was coined by Corneliu Giurgea in a 1972 paper whose title states the ambition plainly: "Pharmacology of integrative activity of the brain. Attempt at nootropic concept in psychopharmacology." He was proposing a category defined by what a compound did to the brain's integrative function, not by its chemical family. It was a scientific proposal, put forward for other scientists to argue with.
Fifty-four years later the word has no legal definition in the United States, no regulatory threshold and no required evidence. Nothing stops any capsule from wearing it. The label is a genre, not a claim you can check.
The label is not the product
How far apart those two things can drift was measured directly. Researchers bought every supplement labelled as containing vinpocetine at two large US retail chains — 23 products. Seventeen actually contained vinpocetine. Among those that did, the amount per recommended daily serving ran from 0.3mg to 32mg. Same word on the front of the box; a hundredfold spread in what you swallow.
This is the argument for buying single, named, dosed ingredients rather than a proprietary blend with a category name on it. Not because single ingredients work better. Because you can at least find out what you took.
The bar a regulator actually applies
It is worth seeing what "improves cognitive function" has to survive to become a legal claim. In 2024 the European Food Safety Authority assessed exactly that claim for creatine, one of the best-studied supplements in existence. The panel weighed 21 human intervention studies plus two more. It noted that an acute working-memory effect seen at 20g a day for five to seven days did not appear at 2.2 to 14g a day, or with 5g a day taken continuously for six weeks; that an effect on response inhibition at 20g a day was an isolated finding among ten trials in healthy people; and that the mechanistic case was weak. Conclusion: a cause-and-effect relationship has not been established.
Read that as calibration rather than as a verdict on creatine. If the compound with hundreds of trials behind it cannot clear the bar, the blend with a Latin name and no dosage on the panel is nowhere near it.
What is left once you drop the word
Ingredients, one at a time, each with its own shape of evidence. The useful thing about dropping the category is that the individual answers turn out to be different from each other, and much more specific than "supports focus".
- bacopa monnieri runs on a twelve-week clock — every trial in the main review dosed for twelve weeks, and the shorter you go the less there is to see.
- Citicoline has some of the better-designed trials on the shelf, and most of them were run by people who sell it.
- The caffeine and l-theanine combination is an acute effect measured in the first two hours, and the meta-analytic moderator work suggests the caffeine is doing most of it.
- creatine and cognition is mostly a story about stressed brains — sleep loss, ageing, and people who eat no meat.
- omega-3 and cognition is a replacement story: the effect turns up in people with low omega-3 status and not in the general population.
- gotu kola has better evidence for microcirculation in legs than for anything measured in a cognitive battery.
- brain-training apps reliably make you better at the app.
And the largest lever in the whole category is not sold in a bottle. Chronic sleep debt produces exactly the attention failures people buy these products for, at an effect size nothing on this list comes close to.
What we'd actually tell you
Three rules, and they cost nothing.
First, buy ingredients, not categories. If the panel says "proprietary cognitive blend, 850mg" you cannot evaluate it, compare it, or repeat it. Second, be suspicious of anything with a racetam-style name in the ingredient list — those are drugs, they are not legal supplement ingredients in the US, and the Mississippi analysis shows the doses in the bottle are not reliably the doses on the label. Third, judge one ingredient at a time against one thing you could actually notice, over the window that ingredient's own trials used.
We sell a capsule in this category. It is two named botanicals at stated doses, which is the format we would want if we were buying rather than selling, and it is still a small effect at best. If somebody offers you a category instead of a dose, they are selling you the word.
Good questions
What does nootropic actually mean?
Legally, nothing. It was coined in 1972 by Corneliu Giurgea as a proposed pharmacological category, but in the United States today it has no regulatory definition and no required standard of evidence. Any capsule can be labelled with it. Treat it as a shelf label rather than a description of what a product does.
Are nootropic supplements safe?
Some are, and some contain unapproved drugs. When researchers analysed 10 memory supplements they found five drugs not approved for human use in the US, at doses up to four times pharmaceutical levels, several of them undeclared. Buy products that name every ingredient with a dose, and avoid anything listing a racetam-style compound.
Do any of these ingredients actually work?
A few have real but modest human evidence, and they do not work the same way. Bacopa needs about twelve weeks. Caffeine with l-theanine is an effect measured in the first two hours. Creatine shows up mainly under sleep deprivation. None of them produce the step change the category name implies.
Is a proprietary blend ever worth buying?
Rarely, and not for this. A blend that lists a total milligram figure for eight ingredients tells you nothing about whether any single one is at a researched dose. You cannot compare it, repeat it, or work out which part did something. Buy named ingredients at stated doses instead.
Why do you sell a product in a category you are criticising?
Because the criticism is of the word, not of every ingredient. Ours lists two named botanicals at stated doses, which is the format we would want as a buyer. The honest expectation is still a small effect, and if you would rather spend the money on fixing your sleep, that is the better purchase.
What should I do before buying anything in this category?
Rule out the boring causes of poor concentration first: short sleep, low iron, thyroid problems, low mood and medication side effects. All produce the same symptom and all are more fixable than a botanical is likely to be. A blood panel and two weeks of honest sleep are a better first purchase than a capsule.
Sources
- Cohen PA, Avula B, Wang YH, Zakharevich I, Khan I. Five Unapproved Drugs Found in Cognitive Enhancement Supplements. Neurol Clin Pract, 2021. View study
- Avula B, Chittiboyina AG, Sagi S, et al. Identification and quantification of vinpocetine and picamilon in dietary supplements sold in the United States. Drug Test Anal, 2016. View study
- Giurgea C. Pharmacology of integrative activity of the brain. Attempt at nootropic concept in psychopharmacology. Actual Pharmacol (Paris), 1972. View study
- EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA). Creatine and improvement in cognitive function: Evaluation of a health claim pursuant to article 13(5) of regulation (EC) No 1924/2006. EFSA J, 2024. View study
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
