Creatine improves cognitive performance

The trials that report a cognitive effect from creatine are mostly trials run during sleep loss. Under sleep loss there is a small, repeated effect. In rested adults at common doses, trials find small or no effects.

The sleep-deprivation evidence is narrow but consistent. A systematic review found only five trials meeting the criteria, covering 3 to 35 hours of sleep loss, and all of them reported modest improvements. The best-designed gave 15 adults a single large dose (0.35g per kilogram of body weight) before 21 hours awake, and measured both brain chemistry and cognition through the night. Processing speed and short-term memory improved, the effect showed up around three hours after the dose, peaked at four, and lasted up to nine.

The evidence in rested adults is weaker. The largest trial to date, 123 adults taking 5g daily for six weeks, found only a small effect that bordered significance on one memory test and did not reach it on abstract reasoning, with no effect across eight other cognitive tasks. In November 2024 the European Food Safety Authority reviewed 21 human trials and concluded that a cause-and-effect relationship between creatine and improved cognitive function has not been established, which means the claim cannot legally be made on products sold in the EU. A 2024 review pooling 16 trials did report a small benefit for memory, with no clear effect on overall cognition or executive function, but EFSA and a 2026 published commentary both noted that it counted several related tests from the same people as separate results, which makes the pooled estimate look more certain than it is. A separate 2024 systematic review concluded the research fails to support the theoretical basis for a cognitive effect at all.

Dose is the second variable, and it is still being worked out. The 2024 trial used a single 0.35g per kilogram dose, which for an 80kg person is 28g, far above the 3 to 5g daily that most people take. A 2026 follow-up in 29 people tested half that amount, 0.2g per kilogram, and found a smaller but still present effect of around 12%, with the benefit appearing in logic tasks rather than the short-term memory and processing speed seen at the higher dose. The researchers described the short-term memory effect as dose-dependent. EFSA noted the same pattern from the other direction: acute working-memory effects appeared at 20g per day but not at lower doses, and not with continuous 5g daily supplementation.

The trials are small. Fifteen people, twenty-nine people, ten people. They are well designed, randomized, double-blind and crossover, several using brain imaging rather than questionnaires, but the total body of evidence on the sleep-loss question is a handful of studies, most published since 2024.

On safety, creatine is among the most studied supplements in sport and is generally well tolerated. The 123-person trial did record side effects significantly more often on creatine than placebo, and mild water retention is the most consistently reported effect. Creatine is contraindicated in kidney disease.