Say the word creatine, and most people picture a shaker, a weights room, the clipped vocabulary of competitive sport. That misses the point entirely: creatine wasn't invented by the sports industry. It's a molecule your own body produces, found naturally in meat and fish, and its name comes from the Greek kreas — flesh.
It's also one of the most thoroughly studied substances in all of nutrition, the subject of more than 500 scientific papers. And in recent years, researchers have stopped looking at it purely through an athlete's lens. Increasingly, the question is what it can do for anyone hoping to hold on to strong muscles and a sharp mind as the decades pass.
A backup battery in every one of your cells
Your cells run on a kind of energy currency called ATP — and the trouble is, the store of it is tiny. A burst of intense effort empties it within seconds. That's where creatine steps in, acting as a backup battery. Stored as phosphocreatine, it recharges ATP almost instantly, right where the energy is needed (Béard and Braissant, J Neurochem, 2010).
A small amount of this reserve is lost through urine every day and has to be topped up — partly by the body's own production, partly through diet (Wyss and Kaddurah-Daouk, Physiol Rev, 2000; Hultman et al., 1996). So this isn't a foreign substance being added to the body. It's a store you're simply keeping full.
Why researchers start paying closer attention after 50
With age comes a gradual loss of muscle mass, strength, and a good deal of the independence that goes with them. It's one of the most visible signs of aging — and one of the few we can genuinely do something about.
A pooled analysis of 22 trials and 721 people, average age between 57 and 70, set creatine against a placebo under precise conditions: two to three resistance-training sessions a week, for anywhere from 7 to 52 weeks. The result was a lean-mass gain averaging 1.37 kg higher than placebo, alongside greater strength gains in both the upper and lower body (Chilibeck et al., Open Access J Sports Med, 2017).
A 2025 review points the same way: in older adults, creatine — particularly alongside training — proves safe, and comes with observed effects on muscle mass and strength, bone, everyday functional ability, and even memory (Candow et al., J Int Soc Sports Nutr, 2025).
Notice the phrase "alongside training". Creatine doesn't replace effort. What it seems to do is help the muscle get more out of the effort you're already putting in.
And what about the brain?
Here's a curious fact: the brain accounts for only a small fraction of your body weight, yet it's one of the most energy-hungry organs you have. So it, too, needs its own backup battery.
More surprising still: the brain doesn't fully trust the delivery route. Creatine crosses the blood-brain barrier poorly, which means the brain has to manufacture a good part of what it needs on its own (Béard and Braissant, 2010; Braissant et al., Amino Acids, 2011). The clearest proof, oddly enough, comes from the extremely rare children born unable to make or transport it at all: the brain is by far the organ hit hardest.
Can a daily intake raise the amount available there? One imaging study measured an average 8.7% rise in brain creatine after 4 weeks of supplementation — in just 6 volunteers, and with considerable variation between them (Dechent et al., Am J Physiol, 1999).
What about mental performance? In a double-blind trial involving 45 young vegetarian adults, 5g a day for six weeks improved both working memory and a test of reasoning (Rae et al., Proc Biol Sci, 2003). A synthesis of six trials covering 281 people concludes that short-term memory and reasoning may well improve, with more mixed results elsewhere, and points to a possible benefit for older or stressed individuals (Avgerinos et al., Exp Gerontol, 2018). Taken together, several studies with quite different designs keep pointing the same way: sharper working memory, better reasoning, a measurable rise in brain creatine within a month. It's that convergence — rather than the size of any single trial — that makes the findings worth watching, even as they await confirmation in larger groups. And on this point, European law leaves no room for maneuver: no health claim is authorized for the brain. It remains a promising line of research, not a commercial promise.
Her and him: not the same starting point
Here's a detail that's easy to overlook: women carry markedly lower creatine stores than men, and yet the overwhelming majority of studies have been carried out on men. A leading review has drawn together what's known about women across the lifespan (Smith-Ryan et al., Nutrients, 2021).
Before menopause, creatine appears effective at improving strength and performance under effort. After menopause, the data are more recent and outcomes depend heavily on dose and training: research is looking at possible effects on muscle and bone, always alongside resistance training. Researchers are also interested in the periods when a woman's creatine metabolism shifts — menstruation, pregnancy, the postpartum period, menopause.
There's one more thread worth mentioning, one that comes up more often in women specifically: preclinical and clinical work hints at positive effects on mood and cognition, perhaps by restoring the brain's energy supply, with the theory that creatine could be even more useful here in the female body. A thread still to be confirmed, not a promise.
3g a day: the dose in the studies, and the dose in the law
Creatine is one of the few substances of its kind for which Europe has authorized a health claim: it increases physical performance in successive bursts of short-term, high-intensity exercise, provided you take 3g a day. That's the exact dose the European experts settled on (EFSA, 2011).
It's also the dose research has scrutinised most closely. A now-classic study found that 3g a day raises the muscle's creatine store by around 20% within 28 days, with no "loading phase" required beforehand. Stop taking it, and that store drifts back to its starting level within about a month (Hultman et al., J Appl Physiol, 1996). Two lessons follow from that: consistency matters more than quantity, since the muscle can't store an unlimited amount, and the effects build up over a month, not overnight.
Three myths worth putting to rest
"Creatine makes your hair fall out." This idea traces back to a single study of 20 rugby players taking 25g a day during a loading phase: their DHT level, a hormone linked to hair loss, had risen. But the study never actually measured hair loss, and testosterone hadn't budged (Van der Merwe et al., Clin J Sport Med, 2009).
"Creatine damages the kidneys." In healthy people, intakes of up to 30g a day for 5 years proved well tolerated (Kreider et al., J Int Soc Sports Nutr, 2017). With existing kidney disease, though, medical advice is essential before taking any supplement.
"You need a loading phase." Not really: taking a moderate daily dose reaches the same store level — just a little more slowly.
What to take from this
Creatine is, first and foremost, a working part of your cells' energy supply — made by the body and topped up by diet. Research is currently interested in it for muscle, the brain, and the years that follow, with solid results in people who train and more fragile leads elsewhere. The reference dose sits at 3g a day, taken consistently. And as ever, no single molecule replaces movement, sleep, and a varied diet.
This article is published for informational and educational purposes. It does not constitute medical advice and does not replace consultation with a healthcare professional.
