Creatine is best known for helping muscles perform, but researchers are also investigating its role in memory, mental performance and brain energy. For adults over 40, that makes it relevant to both physical performance and healthy aging. The evidence is strongest for supporting repeated short, intense efforts and resistance training; brain-health findings are promising but less conclusive. Here is what the research supports, what the numbers mean and how to choose a quality product.
What the research supports
The NIH Office of Dietary Supplements identifies creatine monohydrate as the most studied form. It reports benefits for activities involving repeated brief bursts of effort; benefits for endurance activity are less clear. Meta-analyses in older adults suggest that adding creatine to resistance training can modestly improve some strength and lean-mass outcomes, but studies vary in participants, training and methods. Findings in older adults do not prove that every person over 40 will benefit.
Creatine and brain health: what the studies show
Your brain needs a steady supply of energy for memory, concentration and everyday decisions. The creatine–phosphocreatine system helps regenerate ATP, the energy molecule cells use. That gives researchers a biological reason to investigate creatine for cognitive support. A plausible mechanism, however, does not guarantee a noticeable improvement in thinking.
Memory: encouraging findings with important limitations
A meta-analysis published in Nutrition Reviews in 2023 pooled eight randomized trials and reported a small average improvement in memory: a standardized mean difference of 0.29 (95% confidence interval, 0.04–0.53). The subgroup aged 66–76 showed a larger effect of 0.88, but results varied substantially across those studies. These effect sizes are statistical measures, not percentage improvements in memory, and findings in people in their late 60s and 70s cannot automatically be applied to everyone over 40. A subsequent methodological critique raised concerns about double-counting, so the pooled estimates deserve caution.
A 2024 review of 16 randomized trials involving 492 participants also reported improvements in memory (standardized mean difference, 0.31) and some measures of attention and processing speed. It did not find significant improvements in overall cognition or executive function, which includes planning and decision-making. Crucially, EFSA’s 2024 assessment identified double-counting of related test results in that analysis and concluded that a cause-and-effect relationship between supplementation and improved cognition had not been established. Positive pooled results should therefore be treated as a research signal, rather than a settled benefit.
Sleep loss: a small trial suggests support under stress
In a 2024 randomized crossover study in Scientific Reports, 15 healthy adults received creatine or placebo during approximately 21 hours of sleep deprivation. A single dose of 0.35 grams per kilogram of body weight improved some cognitive tasks and processing speed and altered brain energy measurements. For a 70-kilogram adult, that is roughly 24.5 grams—far above a typical daily maintenance dose. The study suggests creatine may help when brain energy demands are stressed, but it does not establish the same benefit from 3–5 grams daily in well-rested adults. It also does not justify replacing sleep or copying the experimental dose.
Alzheimer’s research: promising early data, not a treatment recommendation
A 2025 pilot study gave 20 people with Alzheimer’s disease 20 grams of creatine monohydrate daily for eight weeks. Brain total creatine increased by approximately 11%, and some cognitive test scores improved. However, everyone received creatine: there was no placebo group. Practice effects from repeating tests and other influences cannot be excluded. The trial supports further controlled research; it does not prove that creatine treats Alzheimer’s disease or prevents dementia.
For adults over 40, the practical message is that creatine has established uses in strength training and potential additional cognitive benefits. The ideal dose for brain health, who benefits most and whether effects persist remain unresolved. Keep regular exercise, sufficient sleep and good nutrition central to your plan.
Form, dose and scale changes
Monohydrate is the sensible form to evaluate because it has the longest research history; pricier forms have not consistently shown superior results. Studies commonly use a maintenance intake of about 3 to 5 grams daily, sometimes after a brief loading phase. Loading is not necessary to reach muscle saturation over time. Follow product directions and seek personal advice where health conditions or medications are relevant.
Some people see their scale weight rise when starting creatine, partly because of increased water stored with muscle. That does not automatically mean fat gain. If you track body composition, compare trends alongside waist measurements, training and how you feel. Our guide to tracking fat loss beyond the scale explains why one weight reading can mislead.
Safety and priorities
Research summarized by NIH generally finds creatine safe for healthy adults when used appropriately, but a person with kidney disease, abnormal kidney tests, pregnancy, or complex medication use should discuss supplements with their clinician first. Supplements can differ in quality. Choose creatine monohydrate from a reputable source with independent testing. Thorne Creatine provides 5 grams of creatine monohydrate per scoop and carries NSF Certified for Sport certification. This certification addresses product quality and banned-substance testing; it does not establish superior brain-health benefits. You can also find Creatine in APP’s Thorne storefront. APP may earn compensation from qualifying storefront purchases, at no additional cost to you. Avoid assuming that more is better.
If you have limited time or budget, first establish a repeatable strength training routine and adequate nutrition. Creatine is a possible addition, not the foundation. This article offers general information rather than individualized medical advice.
Research sources
- Prokopidis et al. Memory meta-analysis, Nutrition Reviews (2023), and methodological critique.
- Xu et al. Cognitive-function systematic review and meta-analysis (2024).
- EFSA assessment of creatine and cognitive-function claims (2024).
- Gordji-Nejad et al. Creatine during sleep deprivation (2024).
- Smith et al. Alzheimer’s disease pilot study (2025).
- Thorne Creatine: current ingredients, directions and certification.
Exercise and safety references
- NIH Office of Dietary Supplements: exercise and athletic performance fact sheet.
- Systematic review and meta-analysis of creatine plus resistance training in older adults.
- Meta-analysis of creatine supplementation and resistance training in older adults.
About APP’s Editorial Approach
Published by Ageless Performance Project. Richard W. Hare, DC, NASM-CES, NASM-PES, CSCS is APP’s founder and developer. Read our editorial standards, evidence approach, and corrections process and affiliate disclosure. General education does not replace individualized care from a qualified healthcare professional.
