A systematic review published in Nutrition Reviews this February pulled together six studies covering 1,542 adults aged 55 and over, about 56 percent of them women, and asked whether creatine does anything for cognition in later life. Five of the six reported some benefit, mostly in memory and attention tasks. One randomized trial found nothing. None of the studies that used the Mini Mental State Examination, the standard screen for global cognition, found an association.

Six studies is a thin base for a claim now printed on a great many tubs, and the authors say so, calling for high-quality trials. What makes this worth explaining rather than dismissing is that the same molecule has a much stronger case elsewhere.

From the Lab to the Ledger

Creatine is not an exotic compound. The body makes about a gram a day, mostly in the liver and kidneys, and meat and fish supply roughly another gram in a typical diet. It is stored largely in muscle as phosphocreatine, where it acts as a rapid battery: when a muscle contracts hard and burns through its immediate energy currency, phosphocreatine regenerates that currency within seconds. Supplementing raises the size of that store.

That is why the muscle evidence is strong and why it has held up for thirty years. In older adults, the most consistent finding is that creatine combined with resistance training produces more lean mass and more strength than the same training alone. It does relatively little on its own without the training, which is the part most often left out of the marketing.

The brain argument runs along the same mechanism. Brain tissue also uses phosphocreatine, and brain energy metabolism is disturbed in aging, in sleep deprivation, and in several neurological conditions. So the reasoning is sound. The difficulty is that supplements raise brain creatine far less than muscle creatine, because the blood brain barrier restricts uptake and the brain makes some of its own. Where cognitive benefits have shown up most clearly is in states of stress, such as sleep deprivation or under hypoxia, and in vegetarians, whose baseline stores are lower because they eat no dietary creatine.

There is also a dosing question the review makes visible. The intervention studies used loading protocols of around 20 grams a day for a week followed by 5 grams daily, doses established for muscle. Whether a higher dose would move brain levels meaningfully, and whether that would be safe over years, has not been settled.

Bio-Pipeline Ledger

Creatine monohydrate with resistance training for muscle mass and strength in adults over 50: well established across decades of trials, one of the better evidenced supplements available, and dependent on the training component.

Creatine for cognition in healthy older adults: preliminary. Six studies, mostly small, mixed results, no effect on global cognition screens, and no trial designed to detect a change in dementia risk.

Creatine under sleep deprivation or other metabolic stress: the setting with the most consistent cognitive signal, and not the setting most buyers are in.

Creatine monohydrate specifically: the form with essentially all the evidence. Hydrochloride, buffered and liquid versions are sold at a premium without trial data showing an advantage.

Safety in healthy adults at standard doses: extensively studied, with no consistent evidence of kidney harm in people with normal kidney function. Anyone with chronic kidney disease should raise it with a physician first.

Creatine as a treatment or preventive for dementia: not established at any level. The scoping reviews describe a hypothesis with preclinical support.

The Clinical Reality Check

What is established is that creatine monohydrate reliably supports strength and lean mass gains when taken alongside resistance training, that this matters increasingly with age, and that it is cheap and well tolerated. If you are lifting weights twice a week in your fifties or sixties, that is a defensible reason to take it, and it is a different reason from the one currently driving sales.

What is overstated is the cognitive claim. Five small studies pointing in a favourable direction is a reason to run a proper trial, not a reason to market a memory benefit. The absence of any effect on global cognition screens is a real caveat rather than a technicality, and nobody has tested whether years of supplementation changes the trajectory of thinking in later life.

The practical reading is that creatine is one of the few supplements worth the shelf space, for a reason that has nothing to do with the brain. Plain creatine monohydrate, around three to five grams a day, from a brand with third-party certification, alongside resistance training, is a reasonable and inexpensive choice. Bought as a memory product, it is being asked to do something the evidence has not yet shown it does.