Sleep, Energy & Cognition
Does Creatine Do Anything for the Brain?
The short answer
It depends heavily on who's taking it. A 2023 meta-analysis of eight randomized controlled trials found creatine improved memory overall (standardized mean difference 0.29), but the effect was large in adults aged 66-76 (SMD 0.88) and close to zero in adults aged 11-31 (SMD 0.03). The largest single trial to date — 123 adults, 6 weeks per arm — found only a borderline effect on working memory (p=0.064) and none on fluid intelligence (p=0.327), with more side effects on creatine than placebo. A 36-person trial in perimenopausal and menopausal women found a medium creatine dose improved reaction time and raised frontal-lobe brain creatine by 16.4% versus 0.9% for placebo. In healthy 10- to 12-year-olds, a week of supplementation changed neither brain creatine nor test scores.
Quick answers
- What is it?
- Whether creatine supplementation does anything for brain function or memory.
- Why are people interested in it?
- Creatine is increasingly marketed as a cognitive enhancer, not just a muscle supplement, so people want to know if it works.
- What has actually been studied?
- A 2023 meta-analysis of eight randomized trials on memory stratified by age, the largest single trial (123 adults in a crossover design), and smaller trials in perimenopausal women, children, and adults under oxygen deprivation.
- How strong is the evidence?
- It depends heavily on age — a meta-analysis found a large effect in adults 66-76 but a near-zero effect in adults 11-31, while the largest single trial found only a borderline effect on one of two primary measures.
- What don't we know yet?
- Whether creatine helps cognition in healthy young and middle-aged adults, the dose and duration needed for a brain effect if one exists, and whether creatine helps people with diagnosed cognitive impairment or dementia.
- Where can I read the original research?
- Sources at the bottom of this page: Effects of creatine supplementation on memory in healthy individuals: a systematic review and meta-analysis of randomized controlled trials and The effects of creatine supplementation on cognitive performance-a randomised controlled study.
The short answer: It depends heavily on who's taking it. A 2023 meta-analysis of eight randomized controlled trials found creatine improved memory overall (standardized mean difference 0.29), but the effect was large in adults aged 66-76 (SMD 0.88) and close to zero in adults aged 11-31 (SMD 0.03). The largest single trial to date — 123 adults, 6 weeks per arm — found only a borderline effect on working memory (p=0.064) and none on fluid intelligence (p=0.327), with more side effects reported on creatine than placebo. A 36-person trial in perimenopausal and menopausal women found a medium creatine dose improved reaction time and raised frontal-lobe brain creatine by 16.4% versus 0.9% for placebo. In healthy 10- to 12-year-olds, a week of supplementation changed neither brain creatine nor test scores.
What the research shows
The rationale, and what the biggest meta-analysis found
Creatine's best-established role is in muscle, where it buffers the fast-turnover phosphocreatine energy system that powers short bursts of effort. The brain runs on the same buffering system, which is why researchers have tested whether raising creatine availability there produces measurable cognitive effects. A 2023 systematic review and meta-analysis in Nutrition Reviews identified ten randomized controlled trials measuring memory in healthy people, eight of which had comparable data for pooling. Overall, creatine supplementation improved memory performance compared with placebo (SMD 0.29, 95% CI 0.04-0.53). But the effect was not uniform across ages: in adults 66-76, it was large (SMD 0.88, 95% CI 0.22-1.55); in adults 11-31, it was near zero and not statistically significant (SMD 0.03, 95% CI -0.14 to 0.20). Neither creatine dose (roughly 2.2-20 g/day across the pooled trials) nor duration (5 days to 24 weeks) explained the age difference.
The largest single trial told a more cautious story
Meta-analyses pool small trials, which can inflate apparent effects. The largest individual randomized controlled trial run on this question, published in BMC Medicine in 2023, tested 123 adults — roughly half vegetarian, half omnivore — in a cross-over design: 5 g/day of creatine for 6 weeks, then placebo for 6 weeks, or the reverse. The creatine effect bordered on significance for backward digit span, a working-memory task (p=0.064), but missed it entirely for Raven's Advanced Progressive Matrices, a fluid-reasoning test (p=0.327). None of eight additional exploratory cognitive tests showed a benefit. Side effects, mostly gastrointestinal, were reported significantly more often on creatine than placebo (relative risk 4.25). The trial's own authors concluded creatine "might have a small beneficial effect," but that larger studies are needed to confirm or rule it out — a notably more cautious read than the age-stratified meta-analysis result above.
The strongest single-trial signals sit in older and midlife women
Two smaller trials add texture to the age pattern. In perimenopausal and menopausal women (mean age 50), an 8-week trial published in the Journal of the American Nutrition Association in 2025 randomized 36 participants to placebo or one of three creatine formulations. The medium-dose creatine hydrochloride group (1,500 mg/day) showed a 1.2% improvement in reaction time versus a 6.6% worsening on placebo, alongside a 16.4% rise in frontal-lobe brain creatine on magnetic resonance spectroscopy, compared with 0.9% on placebo. A separate, earlier trial in 15 healthy adults tested creatine under a specific stress condition — acute oxygen deprivation. Seven days of supplementation raised brain creatine by an average of 9.2% and prevented the decline in attentional capacity that a 90-minute session of 10% inspired oxygen otherwise produced in the placebo condition, according to a 2015 study in The Journal of Neuroscience.
In young, unstressed, healthy people, the evidence is thinner or absent
A 2018 systematic review in Experimental Gerontology, covering six trials and 281 healthy individuals, concluded creatine "may improve short-term memory and intelligence/reasoning," while effects on long-term memory, spatial memory, attention, executive function, reaction time, and mental fatigue were inconsistent across trials — and performance stayed unchanged in young, non-stressed individuals specifically. One trial in that review found vegetarians benefited more than habitual meat-eaters on memory tasks, though not on other cognitive domains, plausibly because vegetarians start with lower dietary creatine intake and more room to gain. In children, the evidence is essentially null: a 2016 trial of 67 healthy 10- to 12-year-olds given 7 days of creatine found no change in brain creatine content — measured directly with proton magnetic resonance spectroscopy in the prefrontal cortex, hippocampus, and occipital lobe — and no improvement on verbal learning or executive function tests. The authors concluded that children mainly rely on their own brain creatine synthesis rather than dietary intake to maintain brain creatine levels.
What we don't know yet
Whether creatine helps cognition in healthy young and middle-aged adults. The largest trial to date found only a borderline effect on one of two primary measures, and the meta-analysis signal in this age group was close to zero.
The dose and duration needed for a brain effect, if one exists. Trials in this body of evidence ranged from a single loading period of days to 24 weeks of continuous supplementation, with no dose-response relationship established for cognitive outcomes specifically.
Whether any cognitive changes persist after supplementation stops. No study reviewed here followed participants after the trial ended to see whether measured effects reversed.
Whether creatine helps people with diagnosed cognitive impairment or dementia. Every trial described here recruited healthy or non-demented participants; none tested creatine in Alzheimer's disease or mild cognitive impairment specifically.
The mechanism linking a measured rise in brain creatine to a measured change in test performance. Two of the trials confirmed brain creatine rose with supplementation, using imaging, but none established that this rise — rather than some other pathway — is what produced the cognitive change.
Sources
- Prokopidis K, Giannos P, Triantafyllidis KK, Kechagias KS, Forbes SC, Candow DG. Effects of creatine supplementation on memory in healthy individuals: a systematic review and meta-analysis of randomized controlled trials. Nutrition Reviews, 2023;81(4):416-427. DOI
- Sandkühler JF, Kersting X, Faust A, et al. The effects of creatine supplementation on cognitive performance-a randomised controlled study. BMC Medicine, 2023;21(1):440. DOI
- Avgerinos KI, Spyrou N, Bougioukas KI, Kapogiannis D. Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials. Experimental Gerontology, 2018;108:166-173. DOI
- Benton D, Donohoe R. The influence of creatine supplementation on the cognitive functioning of vegetarians and omnivores. The British Journal of Nutrition, 2010;105(7):1100-1105. DOI
- Turner CE, Byblow WD, Gant N. Creatine supplementation enhances corticomotor excitability and cognitive performance during oxygen deprivation. The Journal of Neuroscience, 2015;35(4):1773-1780. DOI
- Merege-Filho CAA, Otaduy MCG, de Sá-Pinto AL, et al. Does brain creatine content rely on exogenous creatine in healthy youth? A proof-of-principle study. Applied Physiology, Nutrition, and Metabolism, 2016;42(2):128-134. DOI
- Korovljev D, Ostojic J, Panic J, et al. The Effects of 8-Week Creatine Hydrochloride and Creatine Ethyl Ester Supplementation on Cognition, Clinical Outcomes, and Brain Creatine Levels in Perimenopausal and Menopausal Women (CONCRET-MENOPA): A Randomized Controlled Trial. Journal of the American Nutrition Association, 2025;45(3):199-210. DOI
Article records maintained via PubMed. Peptide Proof reports what studies found. It does not provide medical advice, dosing guidance, or treatment recommendations.
Topic: Brain & Cognitive Health · Sleep & Recovery
Sources
- Effects of creatine supplementation on memory in healthy individuals: a systematic review and meta-analysis of randomized controlled trials
- Nutrition Reviews, 2023 · DOI
- The effects of creatine supplementation on cognitive performance-a randomised controlled study
- BMC Medicine, 2023 · n=123 · DOI
- Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials
- Experimental Gerontology, 2018 · n=281 · DOI
- The influence of creatine supplementation on the cognitive functioning of vegetarians and omnivores
- The British Journal of Nutrition, 2010 · n=128 · DOI
- Creatine supplementation enhances corticomotor excitability and cognitive performance during oxygen deprivation
- The Journal of Neuroscience, 2015 · n=15 · DOI
- Does brain creatine content rely on exogenous creatine in healthy youth? A proof-of-principle study
- Applied Physiology, Nutrition, and Metabolism, 2016 · n=67 · DOI
- The Effects of 8-Week Creatine Hydrochloride and Creatine Ethyl Ester Supplementation on Cognition, Clinical Outcomes, and Brain Creatine Levels in Perimenopausal and Menopausal Women (CONCRET-MENOPA): A Randomized Controlled Trial
- Journal of the American Nutrition Association, 2025 · n=36 · DOI
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