Which brain supplements actually have evidence?

This review concerns brain performance and the outcomes named below. It is educational information, not medical advice. Helibrain sells none of the supplements or treatments rated here.

Evidence at a glance

How to read the table. The grade is our GRADE-style certainty in the stated outcome, using the existing Helibrain evidence base: High means strong confidence, Moderate means the conclusion is likely to hold, Low means it may change with better research, and Very low means it is very uncertain. A high grade can support little or no benefit. Grades apply to the named population, comparator and outcome, not to an ingredient or habit in every setting. [3]

Size and certainty are different. Hedges’ g, Cohen’s d and SMD express a difference in units of the variation between people. Around 0.2 is conventionally small, 0.5 moderate and 0.8 large; these are descriptions, not thresholds for a worthwhile personal benefit. A g of 0.2 does not mean 20% improvement. We preserve the source metric: a z-score difference, risk ratio (RR), odds ratio (OR) or hazard ratio (HR) is labelled separately. These measures cannot be ranked as though they were all the same. Intervals are 95% unless marked otherwise. Statistical intervals do not capture every source of bias. [4]

Creatine: separate plausibility from replicated benefit

The original memory meta-analysis has a published correction in the authors’ reply. Its older-adult signal rests on a very small subgroup, whereas the larger preregistered healthy-adult trial found at most small, uncertain effects. EFSA’s evaluation did not establish the proposed cognitive health claim. [18] [6] [2] [19]

A newer broad meta-analysis reports positive findings on some outcomes. That is a reason for further study, not a reason to ignore different ages, tasks, trial quality or null outcomes. We do not extrapolate acute high-dose sleep-deprivation experiments into a daily dose for rested users. [20]

Fish oil and multivitamins: the headline can hide the outcome

Omega-3 results differ between global cognition, memory subtests and baseline dietary status. Cochrane’s prevention review and VITAL’s cognitive study are important checks on enthusiastic small-trial claims. An individual trial in low-DHA consumers was positive, while another healthy-adult trial was null. [21] [22] [23] [24]

The multivitamin signal is statistically convincing but small. COSMOS-Clinic, COSMOS-Mind and COSMOS-Web are linked substudies, not independent replications in unrelated trials. An earlier trial in male physicians did not show the same general cognitive benefit. Describing a score difference as years of younger brain age is a conversion, not evidence that ageing was reversed. [9] [14] [25] [26]

Where the negative evidence is useful

Ginkgo has been tested extensively enough that routine memory-enhancement and dementia-prevention claims should be treated sceptically. GEM’s cognitive follow-up and the separate GuidAge trial do not rescue those claims. A bleeding meta-analysis found no overall change in haemostatic measures, but that does not remove individual interaction precautions. [27] [28] [29]

B vitamins and vitamin D are not general cognition enhancers in adequately nourished older adults. Correcting a diagnosed deficiency is a different clinical question. The broader vitamin/mineral review supports keeping those claims separate. [10] [11] [30]

How to read a supplement label after reading the studies

A trial of one extract, dose and duration does not validate every bottle bearing the ingredient name. Bacopa’s systematic review and the healthy-young-adult lion’s mane pilot illustrate the limits of transferring a narrow study into a broad product promise. [31] [17]

For caffeine, healthy-adult ceilings are 200 mg per dose and 400 mg across a day; pregnancy has a lower limit. They are safety boundaries, not a prescription for focus. The sleep review gives a clear reason to count the cost of taking it late. [32] [33]

Frequently asked questions

What is the best brain supplement?

There is no supplement proven to broadly improve every cognitive ability. Caffeine has good evidence for a small acute attention effect; that is a much narrower claim.

Is creatine proven to improve memory?

Not as a routine intervention for all healthy adults. Older-adult results are based on small studies, and the larger preregistered healthy-adult trial found small, uncertain effects.

Should I take vitamins for brain health if I am not deficient?

The cognitive evidence does not support routine high-dose vitamin use. The small older-adult multivitamin result does not establish benefits in young adults or justify overlapping products.

Explore related pages

Explore long-term memory, read our diet review, try the n-back snapshot, and read what brain training can and cannot improve. The caffeine calculator helps count intake; it does not determine a safe personal dose.

These activities can help you observe or organise a task. Repeated scores are affected by practice and conditions; they are not a diagnosis or proof that an intervention improved your brain.

How we reviewed the evidence

We started with the Helibrain evidence base and research library, checked the original study or review behind each estimate, and compared supportive and contrary findings. The tables retain the existing outcome-specific grades. Some outcomes have only abstract-level access; access limits and study-quality concerns are recorded in the review notes. We do not treat lack of access alone as a reason to lower a grade. Sources below support different parts of the review and are not all independent studies. Last reviewed: 5 November 2026.