GradedHealth

Does creatine help your brain? What the trials show so far

Creatine is known for muscle. Small trials hint it may help memory and ease some thinking lapses after a sleepless night, but the evidence is limited.

Published October 2026

Short answer

Early and limited: small trials hint at better memory and a smaller drop in some tests after sleep loss. The muscle gains are better supported. Evidence grade C (Limited). Meta-analyses of 8 to 16 small trials; downgraded for inconsistency (overall thinking not improved, high heterogeneity) and small total sample.

Key takeaways

  • Eight trials in healthy people found a small memory gain with creatine, larger in adults aged 66 to 76 [1].
  • A 2024 review of 16 trials found no clear gain in overall thinking or executive function [2].
  • One dose reduced some thinking-test losses in 29 people kept awake for 21 hours, but the trial was small [3].
  • With resistance training, creatine added about 4.4 kg of upper-body and about 11 kg of lower-body strength in adults under 50 [4].
  • In a 123-person brain trial, side effects were reported more often on creatine than on placebo [5].

The short version

Creatine is best known for helping muscles get stronger when paired with weight training [6]. For the brain, the evidence is early and limited [7]. Small trials and reviews suggest a modest gain in memory, larger in older adults, but overall thinking has not clearly improved [1][2].

What the studies show

A 2023 meta-analysis of eight randomised trials in healthy people found that creatine improved memory compared with placebo, with a small effect (standardised mean difference 0.29) [1]. In adults aged 66 to 76 the effect was larger, but the estimate was imprecise [1].

A 2024 review of 16 trials, with 492 people aged about 21 to 76, found improvements in memory, attention and processing speed, but not in overall thinking or executive function [2]. The authors rated the memory finding as moderate certainty and the other findings as low [2]. An earlier review of six small trials in healthy people reported that short-term memory and reasoning may improve, while other skills gave conflicting results [8].

Sleep loss is a separate question. In a 2026 randomised trial of 29 healthy people kept awake for 21 hours, a single dose of 0.2 g per kg of body weight reduced the drop in several tests, including logic, number tasks and a reaction-time test [3]. A 2026 review of five studies on sleep deprivation called the research sparse, though early results were positive [9].

The muscle evidence is firmer. A 2026 meta-analysis of 63 studies (1,489 people) found that creatine with resistance training increased upper- and lower-body strength more than training alone [6]. In adults under 50, creatine plus training added about 4.4 kg upper-body and about 11.4 kg lower-body strength compared with placebo plus training [4].

The nuances

Memory reviews covered doses of roughly 2.2 to 20 grams a day, and dose did not change the result [1]. The 123-person brain trial gave 5 grams a day for six weeks in a crossover design. Its effect was small and bordered on significance for one of two main tests, and not for the other [5]. Vegetarians did not benefit more than omnivores in that trial [5].

In a 2025 crossover trial of 14 physically active men, a week of 20 grams a day improved self-rated sleep quality, but did not change measured sleep time or sleep efficiency [10].

Researchers say trials in older people with clear memory problems are still needed [7].

In one 2024 review, strength gains were significant in men but not in women, a group covered by only two studies with 40 women in total [4]. In postmenopausal women, benefits appeared at 5 grams a day or more with training, while 3 grams a day or less without training showed no measurable effect [11].

Side effects were reported more often on creatine than on placebo in the 123-person trial (relative risk 4.25), but no one stopped because of an adverse event [5]. Across 29 studies that included women, with 951 participants, there were no deaths or serious adverse outcomes [12].

In a 2025 meta-analysis, creatine caused a small rise in blood creatinine, a waste marker, but kidney filtration did not change significantly [13]. The rise appeared in short studies and in studies longer than 12 weeks, but not in between. The authors attribute it to metabolic turnover rather than kidney damage [13]. That review does not describe people who already have kidney disease [13].

In data from a large Parkinson's trial of creatine, caffeine was linked to faster progression only in people also taking creatine [14]. The finding comes from an analysis of a trial of creatine itself, so it needs confirming [14].

A 12-week trial of 38 men found no difference from placebo in DHT or hair follicle measures [15]. An earlier study of 20 rugby players found DHT rose during creatine loading [16], so the question is not fully settled. Several of its authors have ties to supplement companies [15].

Two of the muscle reviews have authors with links to creatine makers or to a sports nutrition group that receives funding from supplement companies [4][11].

Our searches found no trials of creatine in pregnancy or breastfeeding, so we cannot say whether it is safe in those groups. We also found no upper intake limit in the studies we read; the highest dose in the memory review was about 20 grams a day [1].

What this means for you

If your interest is muscle, the strength gains are the best-supported benefit, and they were measured on top of resistance training [6]. For memory, the results are promising but not settled. People with kidney disease, Parkinson's disease or who take medicines, or who drink a lot of caffeine, should talk to a doctor before starting creatine.

Go deeper

  • Creatine — Creatine consistently increases muscle strength during resistance training in healthy adults.

References

  1. Effects of creatine supplementation on memory in healthy individuals: a systematic review and meta-analysis of randomized controlled trials.. Nutr Rev, 2023.
  2. The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis.. Front Nutr, 2024.
  3. Single-Dose Creatine Reduces Sleep Deprivation-Induced Deterioration in Cognitive Performance.. Nutrients, 2026.
  4. Effects of Creatine Supplementation and Resistance Training on Muscle Strength Gains in Adults <50 Years of Age: A Systematic Review and Meta-Analysis.. Nutrients, 2024.
  5. The effects of creatine supplementation on cognitive performance-a randomised controlled study.. BMC Med, 2023.
  6. Resistance training combined with creatine supplementation: a three-level meta-analysis of multidimensional outcomes from strength enhancement to body composition remodeling.. J Int Soc Sports Nutr, 2026.
  7. Creatine and Cognition in Aging: A Systematic Review of Evidence in Older Adults.. Nutr Rev, 2026.
  8. Effects of creatine supplementation on cognitive function of healthy individuals: A systematic review of randomized controlled trials.. Exp Gerontol, 2018.
  9. Creatine Supplementation and Acute Sleep Deprivation: A Systematic Review of Cognitive, Psychomotor, and Mood Outcomes.. J Integr Complement Med, 2026.
  10. Effects of Creatine Monohydrate Loading on Sleep Metrics, Physical Performance, Cognitive Function, and Recovery in Physically Active Men: A Randomized, Double-Blind, Placebo-Controlled, Crossover Trial.. Nutrients, 2025.
  11. Creatine monohydrate for lean mass, strength, and bone density in postmenopausal women: a systematic review and meta-analysis.. J Int Soc Sports Nutr, 2026.
  12. Risk of Adverse Outcomes in Females Taking Oral Creatine Monohydrate: A Systematic Review and Meta-Analysis.. Nutrients, 2020.
  13. Effect of creatine supplementation on kidney function: a systematic review and meta-analysis.. BMC Nephrol, 2025.
  14. Caffeine and Progression of Parkinson Disease: A Deleterious Interaction With Creatine.. Clin Neuropharmacol, 2015.
  15. Does creatine cause hair loss? A 12-week randomized controlled trial.. J Int Soc Sports Nutr, 2025.
  16. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players.. Clin J Sport Med, 2009.