Does Creatine Do Anything for Your Brain?

For older adults there is a measurable memory effect, and for younger adults the same analysis found essentially nothing.

A meta-analysis of randomised trials found creatine supplementation improved memory overall with a standardised mean difference of 0.29. Split by age, the effect in adults aged 66 to 76 was 0.88, while in those aged 11 to 31 it was 0.03, with a confidence interval running from minus 0.14 to 0.20.

So the answer depends almost entirely on how old you are, and for the working-age readers of this site the evidence does not currently show a benefit.

What the meta-analysis found

A systematic review and meta-analysis in Nutrition Reviews searched four databases from inception to September 2021 for randomised trials of creatine against placebo on memory in healthy humans.

Twenty-three eligible trials were initially identified, ten met the inclusion criteria for systematic review, and eight were included in the meta-analysis.

Overall, creatine improved measures of memory compared with placebo, with a standardised mean difference of 0.29 and a confidence interval from 0.04 to 0.53. Heterogeneity was substantial at 66 per cent.

Note how close the lower bound sits to zero. An overall effect of 0.29 with a lower bound of 0.04 is a positive result not far from being a null one.

The age split

The subgroup analysis is where this becomes clear.

In older adults aged 66 to 76, the effect was 0.88, with a confidence interval from 0.22 to 1.55. That is large, though with wide bounds and very high heterogeneity at 83 per cent.

In younger participants aged 11 to 31, the effect was 0.03, with a confidence interval from minus 0.14 to 0.20 and heterogeneity of zero.

An effect of 0.03 with an interval straddling zero, from studies that agreed with each other closely, is about as clean a null as this kind of analysis produces.

The authors’ conclusion reflects this: creatine supplementation enhanced measures of memory performance in healthy individuals, especially in older adults aged 66 to 76.

Also worth knowing what did not moderate the finding. Creatine dose, ranging from roughly 2.2 to 20 grams a day, duration from five days to 24 weeks, sex, and geographical origin did not influence the findings. So the age split is not explained away by older participants taking more or taking it for longer.

A second analysis, and its limits

A 2024 systematic review and meta-analysis took a broader view, covering overall cognitive function, memory, executive function, attention and information processing speed.

It included 16 randomised trials with 492 participants aged 20.8 to 76.4, comprising both healthy individuals and patients with specific diseases. It found significant positive effects on memory, with a standardised mean difference of 0.31, and on attention time at minus 0.31, where the negative sign indicates faster responses.

Its conclusion is carefully hedged: current evidence suggests creatine monohydrate supplementation may confer beneficial effects on cognitive function in adults, particularly in memory, attention time and information processing speed, and larger robust clinical trials are warranted.

Two limits matter. The sample pooled healthy people with patients who had specific diseases, complicating application of the average to a healthy person. And 492 participants across 16 trials is a small evidence base for a substance this widely taken.

The related review notes a further caution: in healthy humans there are mixed results, with some studies reporting benefits on cognitive functioning and others finding no effect.

What the field says about mechanism

The rationale is coherent, which is part of why the claim spreads.

The brain is metabolically demanding and creatine plays a documented role in brain bioenergetics, with some evidence that supplementation can augment brain creatine stores, which could increase memory.

A plausible mechanism is not evidence of an effect, and in this case the mechanism would predict benefits fairly generally, while the data locates them in one age group. If anything, that pattern suggests the effect appears where there is something to correct rather than something to enhance.

That is our reading rather than a claim from either paper, and it is the same pattern this site has found in multivitamins, where benefits tracked participants’ B6 status, and in vitamin D and fatigue, where the finding holds only in people measured as deficient.

Where this belongs with a clinician

This article reports what the trials measured. It gives no dose, names no brands and makes no recommendation.

Creatine is among the more studied supplements for safety in healthy adults, but that is not the same as being appropriate for everyone. If you have kidney disease or reduced kidney function, take medication affecting the kidneys, are pregnant or breastfeeding, or have any chronic condition, whether to supplement is a question for a doctor or pharmacist rather than for a cognitive meta-analysis.

If your reason for considering it is that your memory or concentration has changed noticeably, that is worth investigating rather than supplementing at. Thyroid problems, sleep disorders, depression, anaemia and medication side effects all present that way, and all are treatable once identified.

Common questions

Does creatine improve memory?

In older adults, on this evidence. A meta-analysis of eight randomised trials found creatine improved memory overall with a standardised mean difference of 0.29 and a confidence interval from 0.04 to 0.53. Subgroup analysis found an effect of 0.88 in adults aged 66 to 76 and 0.03 in participants aged 11 to 31, with the younger group’s confidence interval running from minus 0.14 to 0.20. The authors concluded creatine enhanced memory performance in healthy individuals, especially in older adults aged 66 to 76. For a working-age reader, the relevant subgroup is the one showing essentially no effect.

Is it worth taking if I am in my thirties?

The evidence does not currently support that, and this article makes no recommendation. The relevant subgroup analysis, covering participants aged 11 to 31, found an effect of 0.03 with a confidence interval from minus 0.14 to 0.20 and zero heterogeneity, meaning the studies agreed closely on finding nothing. A separate 2024 meta-analysis of 16 trials and 492 participants aged 20.8 to 76.4 did report positive effects on memory and attention time, but pooled healthy people with patients who had specific diseases and concluded that larger robust clinical trials are warranted. If you have kidney problems or take regular medication, this is a question for a doctor.

Does the dose or how long you take it matter?

Not according to the meta-analysis that examined it. Creatine dose ranging from roughly 2.2 to 20 grams a day, duration from five days to 24 weeks, sex, and geographical origin did not influence the findings. That is informative, because it rules out the most obvious explanations for why older adults showed a benefit and younger ones did not. This article deliberately gives no dose guidance, and if you have kidney disease or reduced kidney function, are pregnant, or take medication affecting the kidneys, the decision belongs with a doctor or pharmacist.

Why is everyone talking about it then?

Partly because the mechanism is genuinely plausible. The brain is metabolically demanding, creatine plays a documented role in brain bioenergetics, and there is some evidence supplementation can augment brain creatine stores. That is a coherent story, and coherent stories travel. What the data shows is narrower: a large effect in one older age group, essentially nothing in younger participants, mixed results across the underlying studies in healthy humans, and a 2024 analysis whose authors call for larger trials. A plausible mechanism is a reason to keep studying something, not evidence that it works in you.

Where the effect lives

The interesting thing about this literature is that it contains a clear positive finding and a clear null, in the same analysis, separated by age.

Coverage tends to report the overall figure, 0.29, which is real and small and sits above a confidence bound of 0.04. Underneath it are two very different results: 0.88 in adults in their late sixties and seventies, and 0.03 in people from adolescence to their early thirties, the latter with zero heterogeneity across studies.

If you are reading this at a desk in your thirties, the second number is yours. The first belongs to a different population, studied for a different reason, in the context of age-related cognitive change rather than performance enhancement. That is exactly the pattern omega-3 supplements show too: research on decline, marketed as enhancement.

That does not make creatine useless, and it is not an argument against anyone taking it for other reasons. It does mean the cognitive claim, as it reaches a working-age audience, is carried by an effect measured in people forty years older.