Creatine is best known as a gym supplement, but its most interesting longevity role has little to do with lifting heavier. It helps preserve muscle and strength as you age — the single biggest modifiable predictor of independence in later life — and a growing body of trial evidence suggests it also supports brain energy and memory, especially in older adults. It is one of the most studied, safest and cheapest supplements available, and the long-standing “it harms your kidneys” claim is a misreading of a lab test. Here is what the evidence actually supports.
What creatine does in the body
Creatine is a compound your body makes from amino acids and stores mainly in muscle, where it forms phosphocreatine — a rapid-access energy reserve that regenerates ATP during short, intense demands. You also get it from meat and fish, which is why vegetarians and older adults, who often eat and store less, tend to run lower. The brain uses the same phosphocreatine system to buffer its considerable energy needs, and that is the basis for creatine’s cognitive effects.
Muscle, strength and sarcopenia
Sarcopenia — the age-related loss of muscle mass and strength — drives frailty, falls and loss of independence, and it is one of the most important things to defend against in a healthspan plan. Creatine is one of the few supplements with meaningful evidence here. Combined with resistance training, it consistently improves gains in muscle mass and strength in older adults beyond training alone, and meta-analyses report better performance on functional tests such as the sit-to-stand, a reasonable proxy for fall risk. An expert panel from the sarcopenia research community has recognised creatine as a useful adjunct in managing age-related muscle loss.
One caveat is central: the benefit is mostly seen alongside resistance training. Creatine amplifies the response to lifting; it does little for muscle on its own. If strength training is the foundation of your longevity routine — as it should be — creatine is a well-evidenced multiplier. For why muscle and strength matter so much to lifespan, see our pieces on grip strength as a longevity marker and why your glutes are key to ageing well.
Brain, cognition and energy
The brain is energy-hungry, and when it is stressed — by sleep deprivation, ageing or heavy cognitive load — phosphocreatine stores can become a bottleneck. Supplementing creatine appears to top up that buffer. A 2023 systematic review and meta-analysis pooling several randomised trials concluded that creatine improves memory performance in healthy people, with the effect notably stronger in older adults (roughly ages 66–76) than in younger ones. A 2024 meta-analysis found benefits for memory, attention and processing speed, though not for broad “overall” cognition or executive function.
Two honest qualifications: the effects are specific and modest rather than transformative, and regulators have been cautious — the European authorities declined a general cognition health claim on the grounds that the evidence was not yet conclusive. There are also intriguing early signals that creatine may blunt the cognitive hit of sleep deprivation, which dovetails with our coverage of sleep as an anti-ageing intervention. The overall picture: a real, reproducible cognitive effect concentrated in memory and in people whose baseline stores are low — which disproportionately means older adults.
Who benefits most
Creatine’s benefits scale with how depleted you are to begin with, so the clearest winners are:
- Older adults — lower baseline stores, higher sarcopenia risk, and the strongest cognitive response in the memory trials.
- Women — who tend to have lower natural creatine stores and dietary intake than men, and may see proportionally larger benefits for both muscle and brain, including around the hormonal shifts of menopause.
- Vegetarians and vegans — who get little or no dietary creatine from food and typically start with lower muscle and brain stores.
Dosing: loading vs maintenance
There are two standard approaches, both well established:
- Maintenance only: 3–5 g per day of creatine monohydrate, taken consistently. Muscle stores saturate over three to four weeks. This is the simplest and most popular protocol.
- Loading then maintenance: about 20 g per day split into four doses for 5–7 days to saturate stores faster, followed by 3–5 g daily. Useful if you want results quickly, but not necessary.
Plain creatine monohydrate is the form to use — it is the one studied in virtually all the research, and the fancier, pricier forms offer no proven advantage. Timing is largely irrelevant; consistency is what matters, because the benefit comes from keeping stores topped up, not from an acute dose. Some early data hint that older adults and the brain may respond to somewhat higher intakes, but 3–5 g daily remains the sensible, evidence-backed default.
Safety and the kidney myth
Creatine is among the most thoroughly safety-tested supplements in existence, with decades of use and trials lasting years. The persistent worry that it damages the kidneys rests on a misunderstanding: creatine supplementation raises blood creatinine, a breakdown product that doctors use as a kidney marker. In someone taking creatine, a higher creatinine reading is expected and benign — it reflects the supplement, not kidney injury. In people with healthy kidneys, the evidence does not support harm.
The sensible exceptions: anyone with existing kidney disease should discuss it with their doctor first, and it is worth telling your physician you take creatine so a routine creatinine result is not misread. Mild water retention or stomach upset at high doses are the only common complaints, and both usually resolve with a lower maintenance dose taken with food.
Frequently asked questions
Do I need to load creatine?
No. Loading just saturates your muscle stores faster, within a week instead of three to four. Taking 3–5 g per day from the start reaches the same end point with less fuss and less chance of stomach upset.
Will creatine make me gain weight?
You may gain a kilogram or two early on, but it is water drawn into muscle cells, not fat. For older adults trying to preserve muscle, that is a feature rather than a problem.
Is creatine safe for the kidneys?
In people with healthy kidneys, yes, based on extensive long-term data. It raises blood creatinine as a harmless side effect of the lab marker, which can look alarming but does not indicate damage. Those with kidney disease should check with a doctor.
Can creatine really help my brain?
The evidence points to modest, specific benefits — mainly memory and processing speed — and the effect is strongest in older adults and others with low baseline stores. It is not a broad cognitive enhancer, and expectations should match that.
The takeaway
Creatine is a rare longevity supplement that is cheap, exceptionally safe and backed by solid human trials for two outcomes that matter as you age: muscle preservation and memory. The catch is that its muscle benefit depends on actually doing resistance training, and its cognitive effect is real but modest. For older adults, women and anyone eating little meat, a steady 3–5 g of creatine monohydrate daily — alongside regular strength work — is one of the better-evidenced, lower-risk bets in the whole longevity toolkit. See where it ranks against other options in our evidence-ranked supplement roundup.