Creatine Monohydrate is one of the most heavily researched supplements in existence — but almost all of that research has been about muscle. In the last few years, a newer question has picked up momentum: does creatine do anything for the brain? Here's what the actual trial evidence says, including the parts that don't flatter a sales pitch.
Why the brain, of all places
Around 5% of the body's creatine pool sits in the brain, where it plays the same basic role it plays in muscle: helping regenerate ATP, the cell's short-term energy currency. Brain tissue is metabolically expensive to run, especially under fatigue, sleep deprivation, or mental exertion — which is the biological rationale researchers have used to test whether topping up creatine stores helps cognitive performance the way it helps physical performance.
What the meta-analysis actually found
A 2024 systematic review and meta-analysis in Frontiers in Nutrition pooled 16 randomized controlled trials (492 participants, aged 20.8 to 76.4, including both healthy individuals and patients with specific diseases) testing creatine supplementation against cognitive outcomes.1 Creatine monohydrate was the form used in every included study. The results were mixed, not uniformly positive:
- Memory showed a real improvement (SMD = 0.31, 95% CI 0.18 to 0.44), and this was the only outcome the authors rated as moderate-certainty evidence under GRADE.
- Attention time (SMD = −0.31, 95% CI −0.58 to −0.03) and processing speed time (SMD = −0.51, 95% CI −1.01 to −0.01) both improved, but the confidence intervals nearly touch zero and the certainty of evidence behind both was rated low.
- Overall cognitive function and executive function showed no significant improvement at all.
The benefit also wasn't evenly distributed: subgroup analyses found creatine more beneficial in individuals with diseases, in those aged 18–60, and in females. Short (<4 weeks) and long (≥4 weeks) interventions did not differ significantly. Risk of bias across the included trials was low-to-moderate and no significant publication bias was detected, but the review's own authors were explicit that larger, more rigorous trials are still needed before treating these findings as settled. Worth knowing for anyone following this literature: the paper has since attracted a published corrigendum and a commentary, which is normal for an active area and a reason to treat single pooled numbers as provisional rather than final.
What a single high dose does during acute sleep loss
Almost every trial in that meta-analysis used chronic dosing — a few grams a day, taken for weeks. A 2024 trial out of University Hospital RWTH Aachen in Germany took a completely different approach: one acute dose, tested against a night of sleep deprivation instead of weeks of steady supplementation.3
Fifteen healthy adults (eight of them women, average age 23) completed a double-blind, randomized, placebo-controlled cross-over trial in which they received either a single 0.35 g/kg dose of creatine monohydrate — roughly 25 grams for a 70 kg adult, far above a normal daily serving — or a placebo, then stayed awake through sub-total 21-hour sleep deprivation. Researchers tracked cognitive performance at three points afterward, and, using phosphorus magnetic resonance spectroscopy, measured what was actually happening to the brain's short-term energy reserves in real time.
The cognitive results were larger than anything the chronic-dosing literature has produced. Pooled across the three post-dose testing points, word memory accuracy improved by 10.3% (±3.8) relative to placebo (p = 0.005), and processing time improved on word memory (17.7%), logic (16.0%), numeric (24.0%) and language (29.1%) tasks — every one of those clearing the study's Bonferroni-adjusted significance threshold of α = 0.0063. The brain-imaging data lined up with the behavior: participants who got creatine showed changes in phosphocreatine-to-inorganic-phosphate ratio and ATP consistent with a smaller sleep-deprivation-driven drain on the brain's on-demand energy buffer, and creatine prevented the sleep-deprivation-induced drop in brain pH.
The obvious caveat: this is one small trial (15 people), using an acute single dose several times larger than a typical daily serving, tested against one specific stressor. It doesn't tell you what 5g a day does on a normal, well-rested Tuesday. But it's a genuinely interesting data point, because it lines up exactly with the underlying theory — if creatine's brain benefit comes from buffering ATP demand, it should show up most clearly precisely when the brain is under acute energy stress, and that's exactly where this trial found it. It's also a reminder of how large the sleep-deprivation effect being counteracted is in the first place; we've covered how much sleep adults actually need and what each stage of sleep is doing separately.
Creatine's clearest cognitive signal so far shows up not in healthy, rested adults taking a daily dose, but in brains already under acute energy stress.
The flip side of that is worth stating, because it cuts the other way. A 2023 randomized trial in Brain Sciences gave 30 healthy young adults 10g/day, 20g/day or placebo for six weeks and tested processing speed, episodic memory and attention while imaging prefrontal-cortex activation. Creatine, independent of dose, had no significant effect on any cognitive measure.5 Rested young adults with adequate baseline stores appear to be the population where creatine does least — which is consistent with everything above, and inconvenient for the way creatine is usually marketed.
Why vegetarians and vegans may see more from it
One of the more consistent threads in the cognition data has to do with diet, not dose. Dietary creatine comes almost entirely from meat and fish, so people who don't eat them start with meaningfully lower muscle and brain creatine stores — which gives supplementation more room to do something measurable.
A double-blind, placebo-controlled trial published in the British Journal of Nutrition tested this directly.4 128 young adult women — separated into those who were and were not vegetarian — took 20g of creatine monohydrate daily for five days (a standard short loading protocol) or a placebo, then completed a battery of memory and reaction-time tests.
| Group | Baseline creatine stores | Effect of 20g/day for 5 days |
|---|---|---|
| Vegetarians | Low — little dietary intake | Better memory with creatine |
| Meat-eaters | Higher — regular dietary intake | No memory benefit |
| Both groups | — | Less variability in choice reaction-time responses; no change in vigilance or verbal fluency |
The paper's finding was specific: creatine supplementation did not influence verbal fluency or vigilance in either group, better memory appeared in vegetarians rather than in those who consume meat, and — irrespective of dietary style — supplementation decreased the variability of responses on a choice reaction-time task. It's a small, single trial using a short loading dose rather than long-term daily use, so it's a data point, not a verdict — but it's a plausible, mechanistically sensible one: the people who started with the least creatine in reserve were the ones who had something to gain.
Why EFSA said no
This is the part most brands leave out. In late 2024, the European Food Safety Authority formally evaluated a proposed health claim linking creatine supplementation to improved cognitive function — and rejected it, concluding the evidence wasn't sufficient to substantiate the claim.2 That's a real regulatory body applying a stricter bar than a meta-analysis alone, and it's a useful check on how far the current evidence can honestly be stretched. It's the same kind of check we apply to ourselves when we explain what actually clears our bar.
It's also a useful frame for the two newer trials above: an interesting acute effect under sleep deprivation and a plausible diet-dependent effect in a small sample are exactly the kind of promising-but-preliminary findings that a regulator is right to treat cautiously. Neither changes EFSA's underlying conclusion — they add texture to where and in whom creatine's cognitive effects might be largest, not proof that the effect is bigger than the pooled data shows.
So where does that leave things
Creatine's cognitive research is real, growing, and worth watching — the memory finding in particular is more than noise, and the sleep-deprivation and vegetarian-diet findings both give it a more specific, testable shape. But it hasn't yet cleared the bar for a formal cognitive-function claim, the certainty behind several of the positive findings is low, and a well-designed dose-ranging trial in rested young adults found nothing at all. That's exactly the kind of nuance we think matters: promising is not the same as proven, and we'd rather say that plainly than round it up. It is also, for the record, a good illustration of why placebo-controlled design matters so much in this category.
Creatine's evidence base is strongest on physical performance and muscle — that is where it is worth taking seriously, with the cognitive research treated as an active, honestly-reported area of interest, not a headline claim. If focus is what brought you here and you want to know what we do sell and what its label does and doesn't tell you, Inside Cognitive Support is the honest version.
This article is for informational purposes only and has not been evaluated by the FDA. It is not intended to diagnose, treat, cure, or prevent any disease. Speak with a healthcare provider before starting any new supplement, especially if you take medication or have an existing health condition.
References
- The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis. Frontiers in Nutrition, 2024. frontiersin.org
- Creatine and improvement in cognitive function: Evaluation of a health claim pursuant to Article 13(5) of Regulation (EC) No 1924/2006. EFSA Journal, 2024. efsa.onlinelibrary.wiley.com
- Gordji-Nejad A, Matusch A, Kleedörfer S, et al. Single dose creatine improves cognitive performance and induces changes in cerebral high energy phosphates during sleep deprivation. Scientific Reports, 2024;14:4937. nature.com
- Benton D, Donohoe R. The influence of creatine supplementation on the cognitive functioning of vegetarians and omnivores. British Journal of Nutrition, 2011;105(7):1100–1105. pubmed.ncbi.nlm.nih.gov
- Dose-Response of Creatine Supplementation on Cognitive Function in Healthy Young Adults. Brain Sciences, 2023;13(9):1276. pmc.ncbi.nlm.nih.gov
Related reading: Creatine Monohydrate: The Complete Guide, Creatine Timing: Does Pre- vs Post-Workout Actually Matter?, Phosphatidylserine and Memory and The Science of Deep Sleep.
Creatine is no longer part of the Proco range and cannot be bought here. If focus and cognitive performance is what you're after, Cognitive Support is the closest fit in our current lineup — read what's actually in it before you decide.