Nootropics are substances meant to support memory, focus and mental stamina. The word comes from the Greek noos (mind) and tropein (to bend), and it was coined in the 1960s together with piracetam. Since then they have grown into a huge market where substances with honest data are sold side by side with powders whose exact contents nobody really knows. This article sorts them out: what works, what is marketing and how to handle them safely.
How to read the numbers: Fact = a finding from research or biology
2024 meta-analysis
In bacopa trials
On labels of "brain" supplements
Basics first, capsules second
The brain makes up about two percent of body weight, yet it uses roughly a fifth of the body's energy. If you feed it five hours of sleep, biscuits and stress, no capsule will make up for it. A nootropic is fine-tuning, not a repair. Sleep, movement, daylight and a diet with enough protein and omega-3 fats do more for mental performance than an entire shelf of supplements.
The second thing people forget: how do you know a nootropic is really helping you? If you "feel sharper" after taking it, that is often placebo. A real experiment means one substance at a time, a few weeks, a simple test (reaction time, working memory, notes on focus) and a comparison with a period without it.
A rule that will save you money: one new substance at a time, for at least two to four weeks, and measurement instead of impressions. If you see no difference after that time, drop the substance.
What has solid data
Caffeine and L-theanine. Caffeine blocks receptors for adenosine, a molecule that builds up during the day and signals fatigue. It increases alertness and attention, but in many people also jitteriness and tremor. L-theanine, an amino acid from green tea, smooths off these sharp edges. A meta-analysis of 11 placebo-controlled studies found a moderate effect of combined caffeine and L-theanine on alertness and attention-switching accuracy during the first two hours. Most of the effect is probably carried by caffeine. In practice I use a ratio of roughly one to two, for example 100 mg of caffeine and 200 mg of L-theanine. Have your coffee no later than early afternoon so you do not damage your sleep.
Creatine. Creatine is not just for muscles. Neurons also need ATP, and creatine helps them restore their reserves quickly. A 2024 meta-analysis of 16 randomised trials with 492 participants showed a modest improvement in memory and rated the certainty of evidence for memory as moderate. For processing speed and attention the certainty is low. However, in 2024 the European Food Safety Authority (EFSA) did not authorise a health claim on creatine and cognition: it saw a short-term effect on working memory only at 20 g per day for 5–7 days, not at lower doses. I take 5 g of monohydrate daily, mainly for muscles and bones. The brain is a welcome bonus, not the main reason.
Bacopa monnieri. An Ayurvedic herb with a slow start. A meta-analysis of nine studies in which people took a standardised extract for at least 12 weeks found faster attention and a shorter choice reaction time. So bacopa is not something to try before tomorrow's meeting. If you try it, count on two to three months and on the fact that it causes digestive discomfort in some people.
Promising, but with less data
Lion's mane (Hericium erinaceus). A mushroom that in the laboratory supports the production of nerve growth factor and BDNF. A 2025 systematic review found five randomised trials in humans. When two smaller clinical studies were combined, the MMSE test score rose by an average of 1.17 points. Most of the convincing data, however, come from animals and cells. Reported side effects include stomach discomfort, headache and allergic reactions.
Rhodiola rosea (golden root). An adaptogen from the north that people use for fatigue and stress. A systematic review of randomised trials allows for a beneficial effect on physical and mental performance under fatigue and reports only a few mild side effects. Independent replications of the studies are missing, though. I do not see rhodiola as a performance booster, more as better cooling for an overloaded processor during demanding periods.
Omega-3 (DHA and EPA). DHA is a building block of neuronal membranes, and eating fish makes sense. As a nootropic in healthy people, however, omega-3s do not work. A Cochrane review of three high-quality trials with 3,221 older people without memory problems found no difference in a cognitive test after 24 to 40 months. So take omega-3s for your heart and for a diet low in fish, not for a sharper mind.
Modafinil and racetams: where supplements end
Modafinil is a prescription drug. It is approved for treating excessive daytime sleepiness, for example in narcolepsy. A systematic review of studies in healthy, well-rested people found that in more complex tasks it improves attention, executive functions and learning, while results in simple tests are mixed. Some studies even showed impaired creative thinking. It can interact with other medicines, for example hormonal contraception. You should only use it in agreement with your doctor. Do not buy it online and do not dose it on your own.
Racetams (piracetam, aniracetam, phenylpiracetam and others) have a legendary reputation in the biohacking community. Evidence of their effect in healthy people is weak, however, and in Europe piracetam is registered as a medicine, not a food supplement. The bigger problem is quality. When American researchers analysed 10 over-the-counter "brain" supplements, they found five unapproved drugs, including substances not listed on the label at all. As many as 9 out of 12 declared amounts (75 %) were inaccurate, and at the recommended serving a person could get up to four times the usual pharmacological dose. This is no longer biohacking, it is roulette.
Safety and cycling
- Verified quality – in Europe, supplements do not have to prove efficacy before going on sale. Look for third-party certificates (for example NSF or Informed Sport) and avoid "proprietary blends" without stated amounts.
- Medicines and illnesses – if you take antidepressants, blood thinners, blood pressure or thyroid medication, consult your doctor or pharmacist before any nootropic.
- Pregnancy, breastfeeding and adolescents – nootropics have no place here.
- Cycle caffeine – the brain quickly gets used to caffeine and adds adenosine receptors. A regular break, for example one to two weeks without coffee every few months, restores the effect.
- Adaptogens with breaks – in the community we take rhodiola or bacopa in blocks, for example two to three months followed by a break. That way you find out whether you miss anything at all.
- Creatine and omega-3 are not cycled – they work through tissue stores, so long-term daily use makes sense.
For the first two weeks nothing new, just sleep and a regular routine. Then caffeine with L-theanine in the morning in a one-to-two ratio, on working days only. If you want to add something long-term, start with creatine monohydrate, 5 g a day. Try bacopa or lion's mane only after that, always one substance at a time, for at least eight to twelve weeks, with a simple memory test at the beginning and at the end.
- Strong evidence Caffeine and its combination with L-theanine improve alertness and attention in the short term. Omega-3 supplements do not improve cognition in healthy older people.
- Moderate evidence Creatine for memory, bacopa for speed of attention after 12 weeks, modafinil for complex tasks in healthy people (prescription drug).
- Weak evidence Lion's mane and rhodiola – few human studies, independent replications missing.
- No evidence Racetams as brain boosters in healthy people and "miracle" blends with undisclosed ingredients.
Conclusion
The best nootropic is still a well-rested brain. Among supplements, plain caffeine has the strongest data, ideally with L-theanine; creatine brings modest but real benefits, and so does bacopa if you are patient. Lion's mane and rhodiola are interesting but so far more promising than proven. Modafinil belongs in the hands of a doctor, and you are better off avoiding racetams from online shops. Measure, test one thing at a time and do not be lured by marketing.
