Creatine and the brain: what has been measured outside the gym

Creatine is one of the few sports supplements with a solid evidence base for strength performance. In recent years, it has also been marketed as "brain fuel." Data here is much scarcer and works differently: the effect is not seen in everyone, but rather in those whose baseline levels are depleted for some reason.

Why the brain is part of the conversation at all

Creatine phosphate acts as a rapid ATP buffer—wherever energy is needed instantly. Muscle is not the only such tissue: the brain consumes about a fifth of the body's energy while accounting for about two percent of its mass. Hence the hypothesis: if you increase the brain's creatine stores, resistance to fatigue should increase.

The hypothesis is plausible, but plausibility is not a result. The same gap between mechanism and outcome is described in our article on biohacking in general.

Two reviews and a debate on methodology

A systematic review and meta-analysis of randomized trials on memory in healthy individuals described improvements in memory performance with creatine compared to a placebo, with more noticeable effects in older participants — Nutrition Reviews.

A more recent review on cognitive functions included 16 randomized trials and 492 participants aged 20.8 to 76.4 years. Significant effects were found for memory (standardized effect size 0.31), attention span, and information processing speed; all included studies used creatine monohydrate. The authors conclude that larger and more robust trials are needed. Review in Frontiers in Nutrition. This paper later received a correction and a published commentary with methodological objections—the field is currently at a stage where experts are debating the methodology rather than the magnitude of the effect.

The overall picture from both works: there is a signal, it is small, there are 492 people in total, and the duration of individual trials is measured in weeks.

Where the effect is more noticeable

A recurring detail: the difference from a placebo is more often seen where the initial state is worse. This includes older participants, people with sleep deprivation, vegetarians, and vegans.

The latter is explained by simple arithmetic. Creatine is obtained from meat and fish, and the body also synthesizes it itself. In a person who does not eat meat, intake is lower, and a supplement shifts the stores more significantly than in someone who eats meat daily. By the same logic, studies more often show responses in those whose muscle creatine stores were lower—this is also described for strength performance in our article on creatine, glutamine, and lecithin.

What is known about safety

Creatine monohydrate is one of the most studied supplements in sports science. The most common reported effect is weight gain in the first few weeks due to water retention in the muscles, usually around one to two kilograms. For someone watching their weight, this looks like a setback, even though fat mass has not changed.

A separate issue is creatinine in lab tests. Creatine breaks down into creatinine, so its level in the blood can rise during supplementation, and the lab report may show a figure that is interpreted as impaired kidney function. For those with kidney disease or those on long-term medication, this issue should be discussed with a doctor, not on a forum.

The condition that gets lost in translation

A lot has been known about muscles and creatine for a long time. About the brain—little, for a short time, and in small groups, and the effect, according to the data, depends on how depleted the stores were initially. This is not the same as saying it "improves cognitive functions": the phrasing that holds up to the data is more modest and contains a condition.

How to distinguish one from the other is analyzed in our article on self-experimentation.

Count it from a photo

Frequently asked questions

Does creatine improve memory?

A meta-analysis of randomized trials in healthy individuals described improvements in memory performance compared to a placebo, which were more noticeable in older participants. A later review of 16 trials with 492 participants showed a standardized effect size of 0.31 for memory. The trials are small and last for weeks.

In whom is the effect more noticeable?

In studies, the difference from a placebo was more often seen in older participants, those with sleep deprivation, and people who do not eat meat. The general explanation is a lower initial creatine store.

Why does weight increase while taking creatine?

Due to water retention in the muscles during the first weeks of intake, usually about one or two kilograms. Fat mass does not change during this process.

Can creatine affect blood test results?

Creatine breaks down into creatinine, so its levels in the blood may rise while taking it. This is not an indicator of kidney damage, but the laboratory result is interpreted differently in such a situation, and the doctor should be informed about the intake.

How does the data on the brain differ from the data on muscles?

In volume and maturity. There are many long-standing trials on strength performance. Regarding cognitive functions, there are few studies, they are short, conducted on small samples, and objections have been published regarding the methodology of one of the recent reviews.

Read next

• Sports supplements: creatine, glutamine, lecithin — The sports nutrition shelf is arranged so that expensive and useless products stand next to cheap and effective ones.
• Protein and muscle protein synthesis: dose, leucine and the anabolic window — Protein comes with its own arithmetic: thirty grams per meal, a leucine threshold, a window after training.
• How dietary supplements differ from vitamins and medications — In a pharmacy, two packages of vitamin D sit on the same shelf.

This article is for general information. It is not medical advice, a diagnosis, or a prescription for treatment or a diet, and it does not replace a consultation with your doctor. If you have a health condition, are pregnant, take medication, or follow a diet prescribed to you, decisions about food belong with your doctor.

Figures from regulations, guidelines and studies are given as they stood when this article was prepared and may since have changed; check them against the primary sources. This article is not advertising, an offer, or individual advice, and neither the author nor the site owner is responsible for decisions taken on the basis of it.