Creatine and the brain: the reserve you think with

Creatine has been the best-evidenced sports supplement for thirty years. The more recent finding is that the tissue with the second-highest demand for it is not muscle. It is the brain.

What the brain actually does with it

Neurons are metabolically expensive and hold very little ATP in reserve. What they hold instead is phosphocreatine — a rechargeable buffer that donates a phosphate group to regenerate ATP faster than the mitochondria can produce it. When demand spikes, that buffer is what carries the gap.

Brain creatine is partly synthesised locally and partly imported across the blood-brain barrier. Transport is slower than into muscle, which is why brain stores respond to supplementation more gradually and why the shorter dosing trials in the literature tend to show smaller effects.

What the trials found

A 2018 systematic review of randomised controlled trials in healthy adults reported improvements in short-term memory and reasoning with creatine supplementation. The effect was not uniform. It concentrated in two groups.

People under acute stress. In sleep-deprived subjects, creatine improved processing speed and reduced error rates relative to placebo. Trials in oxygen-restricted and mentally fatigued conditions point the same way. Rested, unstressed subjects show much less separation.

People with low baseline stores. Creatine comes almost entirely from meat and fish. Vegetarians and vegans start lower in both muscle and brain, and are consistently the group where cognitive response is largest. In some vegetarian trials the memory effect is substantial; in omnivores it is modest.

Form and dose

Creatine monohydrate is what the research used. It is also the cheapest form and the one with the longest safety record. The buffered, liquid and "advanced" variants sold at a premium have not demonstrated superiority over monohydrate in head-to-head work.

Three to five grams daily is the maintenance dose. Loading protocols shorten the time to saturation in muscle but are not necessary; daily dosing reaches the same place in three to four weeks. Brain saturation appears to take longer than muscle, so cognitive trials running under four weeks may simply be measuring too early.

What it is not

It is not a stimulant, and it does not feel like one. There is no acute effect to notice. It is also not a treatment for any cognitive condition, and the research in clinical populations is early and mixed.

What it is: a well-tolerated, inexpensive, heavily studied compound that raises the metabolic buffer your brain draws on when it is under load. For a population that is chronically short of sleep and increasingly short of dietary creatine, that is a reasonable place to start.