Is creatine good for the brain? Does it help with cognition?

Creatine monohydrate at 5–10 g/day produces measurable improvements in cognitive tasks requiring high-energy phosphate turnover (working memory, intelligence tests under time pressure, reaction time), particularly under conditions of acute sleep deprivation, mental fatigue, or in populations with suboptimal dietary creatine intake (vegetarians/vegans), but the effects in well-nourished, non-sleep-deprived men are modest (McMorris et al., Neurosci Biobehav Rev, 2007).

The brain uses approximately 20% of the body's energy at rest and relies heavily on the creatine-PCr system for rapid ATP regeneration during intense cognitive demands. This is the same energy system creatine supports in muscle. The cognitive creatine effect is most pronounced when cognitive demand meets an energy supply constraint, sleep deprivation being the clearest example. For men already eating adequate protein and creatine-containing foods (meat, fish), the marginal cognitive benefit of supplemental creatine is smaller but not absent.

Honesty Scale: Promising (2) for creatine cognition effects in sleep-deprived or fatigued states. Early (3) for cognitive benefits in well-nourished, non-sleep-deprived adults.

What to do: If you are already taking creatine for muscle performance reasons, the cognitive benefit is a bonus that costs nothing. If you are considering creatine specifically for cognition, the evidence is less compelling than for muscle function and should not be the primary justification.

For the full picture, read The Supplementation Deep Dive