Creatine and Your Brain: What the Evidence Actually Shows

The review covered 492 participants aged 20.8 to 76.4, a mix of healthy adults and people with specific conditions (fibromyalgia, Parkinson's-related cognitive impairment, schizophrenia). All studies used creatine monohydrate — the same form used in strength training protocols — so this isn't about some specialised nootropic formulation.

Memory came out as the strongest finding: a significant positive effect (SMD = 0.31) built on 24 studies and 1,000 participants — a large enough evidence base that the researchers rated their confidence in this result as moderate, the highest certainty rating in the whole paper.

Two other measures improved: attention time and processing speed time — meaning creatine didn't necessarily make people more accurate, but it made them faster at completing the tasks. That's a distinction worth sitting with: creatine's effect showed up more in speed of cognitive processing than in raw accuracy scores.

Overall cognitive function, executive function, and attention scores (accuracy, not speed) showed no significant effect. This matters for expectation-setting — creatine isn't a general-purpose "smarter pill." Its effects are concentrated in specific processing-speed and memory domains, not across the board.

The subgroup analysis was the most interesting part. Effects on attention time were significant in people with existing health conditions and in the 18–60 age bracket, but not in healthy people or in adults over 60. Effects on processing speed time were significant in women but not in men. This points toward creatine's cognitive effects being conditional — dependent on baseline energy demand or deficit — rather than a uniform boost for everyone.

Short interventions (under 4 weeks) and longer ones (4+ weeks) produced similar results, suggesting any cognitive benefit plateaus early rather than building over time — different from the loading-then-maintenance logic used for muscle performance.

Certainty of evidence was only rated moderate for memory; every other outcome was rated low to very low. Small sample sizes and study heterogeneity mean these findings are a genuine signal, not a settled conclusion. This is a "promising, worth watching" result — not a green light to market creatine as a cognitive enhancer.

For a client already taking creatine for strength and body composition reasons, there's a legitimate secondary case to make around memory and processing speed — but it's not a reason to add creatine to someone's routine for brain benefits alone, especially at this level of evidence certainty.