Creatine for Cognition (Not Just Muscles)

Creatine is the most-studied performance supplement in history. Most users know it as a muscle-builder. Fewer know it is also one of the better-evidenced cognitive enhancers.

The Brain Uses Creatine

The brain consumes ~20% of the body's ATP. Phosphocreatine (PCr) is the fastest ATP buffer available — milliseconds — and brain PCr stores are a measurable bottleneck under cognitive load and sleep deprivation.

The Evidence

Rae et al. (2003) showed improved working memory under mental fatigue at 5 g/day. McMorris et al. (2006) replicated under sleep deprivation. Kious et al. (2019) reviewed creatine's antidepressant effects.

Who Benefits Most

Vegetarians have ~30% lower baseline brain creatine because dietary creatine comes from animal flesh. They show the largest cognitive lift on supplementation.

Sleep-deprived individuals — anyone routinely under-sleeping.

Elderly populations — brain PCr declines with age.

Dose

5 g/day (3 g for smaller adults). No loading phase required for cognitive benefit. Monohydrate is the cheapest and best-evidenced form — fancy variants (HCl, ethyl ester) have not outperformed it in trials.

Safety

Decades of data. No evidence of kidney damage in healthy individuals at recommended doses. Expect a 1–3 lb water-weight gain in the first two weeks.