Creatine for cognition: a careful look at recent evidence

Creatine monohydrate is one of the few supplements with a large, consistent body of human research. The strength and power evidence is settled. The cognitive evidence is newer, smaller, and more nuanced, but increasingly suggestive.

The strength evidence (in brief)#

Decades of trials and meta-analyses establish that creatine monohydrate (3–5 g/day, with or without a loading phase) reliably increases muscle creatine stores, strength, and high-intensity exercise performance. Side effects at recommended doses are minimal: mild water retention, no consistent renal or hepatic concerns in healthy adults.

The cognitive evidence#

Several recent studies have tested creatine on cognitive tasks under stress:

• Sleep deprivation. Multiple small trials (McMorris et al. 2006, 2007; Gordji-Nejad et al. 2024) have shown improved reaction time, psychomotor performance, and mood after creatine loading in sleep-deprived participants. The 2024 paper used 0.35 g/kg as a single dose and showed measurable effects within 3 hours.
• Vegetarians and vegans. Dietary creatine intake from animal foods is around 1–2 g/day in omnivores; vegetarians and vegans get near zero. Trials in vegetarians (Rae et al. 2003) have shown improved working memory and intelligence test scores after creatine supplementation.
• Ageing. A 2018 systematic review (Avgerinos et al.) of 6 RCTs of creatine for cognition in healthy individuals found short-term memory and reasoning may improve; only one of the six included trials was in older adults, but the authors suggest creatine may benefit ageing or stressed individuals more than young, unstressed ones.
• Mood and depression. Smaller studies have explored creatine as an adjunct in depression (Lyoo et al. 2012, Roitman et al. 2007) with mixed results. The mood/mental-health literature is not yet at the strength of the cognitive-task literature.

Dose#

The conventional dose for muscle creatine saturation is 3–5 g/day. Effects on cognition typically use the same daily dose; some trials use higher doses (10–20 g/day) for specific contexts like sleep deprivation. Sustained intake at 5 g/day is the practical default.

A "loading phase" of 20 g/day split into 4 doses for 5–7 days saturates muscle creatine faster but isn't required.

Safety#

The pooled safety data on creatine monohydrate is excellent, among the strongest of any sports supplement. The most common side effect is mild weight gain (1–2 kg) from intracellular water retention. Kidney function tests can show slightly elevated creatinine because creatinine is the metabolite, but this is not actual kidney injury.

People with chronic kidney disease should not start creatine without clinical input. Pregnant and breastfeeding women have limited safety data.

Forms and quality#

Creatine monohydrate is the only form with substantial evidence. Branded alternatives (HCl, ethyl ester, buffered, etc.) are more expensive and not better-supported. UK Sport, the FDA, and most major sports nutrition reviews recommend creatine monohydrate as the standard.

Supplements aren't regulated to medicine standards in the UK; choose brands with Informed Sport certification or batch-tested third-party verification for sport contexts.

What it isn't#

Creatine is not a "smart drug" in the sense of producing immediate cognitive enhancement in well-rested healthy adults. The cognitive effects are most reliable in stressed populations: sleep-deprived, vegetarian, older. For a well-fed, well-rested omnivore, the cognitive effect of creatine on top of normal dietary intake is modest.

For people who train and would benefit from its strength effects, the cognitive evidence is a useful bonus. For people considering it purely for cognition, the evidence is suggestive but not yet at first-line-recommendation strength.