Creatine: Muscle, Bone, and Brain Research Beyond the Gym
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The Most Researched Performance Supplement — With Interest Beyond the Gym
Creatine monohydrate is one of the most studied sports nutrition supplements. Decades of randomized controlled trials have looked at its effects on exercise performance and muscle mass with a level of consistency rarely seen in supplement research.
Creatine's more recently emerging research area is not in competitive athletes — it is in older adults. A growing body of research is looking at whether creatine monohydrate, particularly combined with resistance exercise, may relate to age-related changes in muscle mass and strength, bone density, and cognitive measures. None of this research means a supplement treats or prevents any diagnosed medical condition.
What Is Creatine and How Does It Work?
Creatine is a compound naturally synthesized in the liver and kidneys from three amino acids — arginine, glycine, and methionine. About 95% of the body's creatine is stored in skeletal muscle as phosphocreatine. Dietary creatine comes primarily from beef, pork, and fish — which means vegetarians and vegans have significantly lower baseline creatine stores.
Phosphocreatine acts as a rapid energy buffer. During high-intensity exercise, it donates a phosphate group to regenerate ATP (the primary cellular energy currency) in the first 10 seconds of explosive effort. Supplementing with creatine increases the phosphocreatine pool, which is thought to support sustained power output during this kind of exercise.
Beyond energy metabolism, creatine also appears to have effects related to muscle protein turnover and markers of muscle damage after exercise.
What Researchers Are Studying
Muscle Strength and Mass
A 2024 comprehensive review published in Current Osteoporosis Reports, authored by creatine researchers at the University of Regina, examined the breadth of evidence on creatine and muscle, bone, and cognitive measures in older adults. On muscle, the review described research finding that creatine monohydrate combined with resistance training was associated with greater lean mass, limb muscle thickness, upper and lower body strength, and functional capacity measures in older adults compared to resistance training alone. (PMID: 39509039)
This aligns with a separate meta-analysis finding that creatine supplementation combined with resistance training was associated with greater gains in lean tissue mass and muscle strength compared to resistance training alone in adults over 50. This describes research findings on strength and lean mass measures — it is not a claim that creatine treats age-related muscle loss as a diagnosed condition.
Bone Health
The same 2024 review described emerging research suggesting creatine monohydrate combined with resistance training may relate to bone mineral density and bone geometry measures in older adults. This is an emerging research area, and findings should be treated as preliminary rather than established.
Cognitive Measures
The brain uses significant amounts of ATP and has its own creatine-phosphocreatine system. Preliminary research has looked at creatine supplementation and short-term cognitive task performance, including under conditions of sleep deprivation or mental fatigue. A small pilot study explored creatine monohydrate supplementation over 8 weeks in a clinical population under a physician's care and reported early, limited signals worth further study — this is very preliminary research and does not establish that creatine affects any neurodegenerative disease, and should not be read as a treatment claim.
Safety
Creatine monohydrate has one of the more established safety profiles among widely used supplements, with a large body of research across diverse populations not identifying serious adverse effects at standard doses (3–5g/day) in healthy individuals. A commonly repeated concern that creatine damages kidneys has not been supported in research on healthy individuals — though those with pre-existing kidney disease should consult a physician before use.
Who Considers Creatine
The most common users are people engaged in resistance training who want to support strength and recovery. There is also growing research interest in older adults concerned about maintaining muscle mass and functional strength as they age. Vegetarians and vegans have lower baseline creatine stores and may see proportionally larger changes in markers with supplementation. Anyone with a diagnosed medical condition, including cognitive or neurological conditions, should be evaluated and guided by a healthcare provider rather than relying on a supplement.
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*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
How to Take Creatine
A commonly studied maintenance dose is 3–5g of creatine monohydrate daily. A loading phase (20g/day split into 4 doses for 5–7 days) can saturate muscle stores faster but is not necessary — a similar endpoint is generally reached with consistent daily dosing over 3–4 weeks.
Creatine can be taken any time of day. Mix with water and maintain adequate overall hydration, as creatine draws water into muscle cells.
Creatine monohydrate is the most studied form and is also generally the least expensive. Other forms (creatine HCl, buffered creatine, creatine ethyl ester) have not been shown to be superior in clinical trials.
The Bottom Line
Creatine monohydrate has a large research base in sports nutrition, and a growing body of research is looking at its relevance for older adults' muscle strength, bone measures, and cognitive measures alongside resistance exercise. None of this establishes that creatine treats or prevents any diagnosed disease, including age-related muscle loss or cognitive conditions. Its general safety profile in healthy adults is well documented and its cost is relatively low, which is part of why it's widely studied.
References
1. Candow DG, et al. Creatine monohydrate for muscle, bone and brain in older adults. Curr Osteoporos Rep. 2024. PMID: 39509039
2. Lanhers C, et al. Creatine supplementation and lower limb strength performance: systematic review and meta-analysis. Sports Med. 2015. PMID: 26018912
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. Products mentioned are not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and does not constitute medical advice. Consult your healthcare provider before beginning any supplement regimen.