The guide

Creatine for the brain: what the studies show

By GyroscopeUpdated November 15, 202614 sources

Maybe a little. Supplements raise creatine in the brain by only about 5% to 10%, and across 16 trials memory improved slightly while overall thinking didn’t change. The clearest results came during sleep loss, and the biggest trial in healthy people found a small effect at most. Take creatine for your muscles and count the brain as a possible bonus.

Creatine has a second career online as a brain supplement. Podcasts call it a nootropic, people take it for focus at work, and women are told it helps with brain fog. The idea isn’t silly. Your brain runs on the same quick energy system as your muscles, and there are real trials. But the trials are smaller and more mixed than the excitement, and one of the most repeated claims, that vegetarians get a bigger brain boost, didn’t hold up in the biggest trial built to test it.

Why it might work

Brain cells burn ATP all day, and like muscle they keep a phosphocreatine reserve that rebuilds it on the spot. The same enzyme that runs the system in muscle, creatine kinase, also shuttles energy from the mitochondria, where it’s made, to the parts of the cell that use it (ISSN 2017). In theory, more creatine means a steadier supply when the brain is under strain, like a long night awake.

The problem is getting it in. Muscle depends on creatine from the blood. The brain makes most of its own, and the wall between the blood and the brain has few of the transporters that carry creatine across (Antonio 2025). So a dose that fills your muscles by 20% to 40% moves brain creatine much less.

It’s like filling a swimming pool through a garden hose when the pool already has its own spring. You can do it, but it takes a lot of water and a long time, and the level only creeps up.

What the trials found

In healthy, rested adults

In 2024 Xu and colleagues pooled 16 randomized trials with 492 adults. Memory improved a little (an effect size of 0.31, which counts as small), and so did attention time and processing speed. Overall thinking and planning didn’t change. A 2018 review of 6 trials in 281 healthy people came out the same way, with short-term memory and reasoning possibly better, and no change in young people.

The largest single trial was published in 2023. Sandkühler’s team gave 123 people 5 g a day or placebo for 6 weeks each. Their statistics leaned toward “a small beneficial effect”. A memory test where you repeat numbers backward came close to a clear result, and a reasoning test and eight extra tests didn’t move. People reported side effects 4.25 times as often on creatine as on placebo.

In 2024 the European Food Safety Authority reviewed 23 human studies for a company that wanted to print a thinking claim on creatine. It found the working memory effects showed up at 20 g a day for 5 to 7 days in two studies, and not at lower doses or at 5 g a day for six weeks. It concluded that a cause and effect hadn’t been shown.

In vegetarians, the result that didn’t replicate

The vegetarian idea came from two early trials. In 2003, 45 young vegetarians took 5 g a day for six weeks, and their working memory and reasoning scores went up. In 2011, a study of 128 young women gave 20 g a day for five days, and memory improved in the vegetarians but not in the meat eaters.

Then Sandkühler’s 2023 trial, built partly to test this with about half vegetarians, found that “vegetarians did not benefit more from creatine than omnivores.” The likely reason is that vegetarians don’t start lower in the brain. Their muscle and blood creatine is lower, but the two studies that measured brain creatine found it about the same as in meat eaters (Kaviani 2020), since the brain makes its own. Creatine for vegetarians and vegans covers where the vegetarian advantage is real, which is muscle.

During sleep loss

This is where the results are most consistent. Sleep loss lowers brain creatine and slows thinking (Antonio 2025). Two trials gave young adults 20 g a day for a week, then kept them awake for 24 to 36 hours. They lost less ground on reaction time, balance, mood and complex tasks than people on placebo. In rugby players sleeping only 3 to 5 hours, a single dose of 50 or 100 mg per kg kept a passing skill from slipping.

In 2024, Gordji-Nejad’s team gave 15 young adults a single dose of 0.35 g per kg in the evening of a night without sleep. Brain scans picked up changes in its energy chemistry, and thinking speed held up, with the biggest effect about four hours after the dose. That dose is about 28 g at 176 lb, five or six times a daily scoop, and nobody has tested it as a habit. Does creatine help when you haven’t slept? has the details.

For depression

Across 11 trials and 1,093 people, creatine moved depression scores by 2.2 points, below the 3 points people notice, and the evidence was rated very low (Eckert 2025). A 2026 review of 5 trials found the most promise as an add-on, with an antidepressant or with talk therapy, and no benefit in adolescent girls or in bipolar depression. In the small bipolar trial, two of the 17 people on creatine had a manic or hypomanic episode early on. Can creatine help depression? has more.

With aging and Alzheimer’s

In a 2025 pilot, 20 people with Alzheimer’s took 20 g a day for 8 weeks. Brain creatine rose 11% and some thinking tests improved. There was no placebo group, so it’s a reason to run a proper trial and nothing more yet. The 2018 review also suggested older and stressed brains may gain more than young rested ones, which fits the energy idea but hasn’t been proven.

What’s known and what isn’t

• Known: supplements raise brain creatine a little, slowly, and more at higher doses. It’s safe at these doses in healthy adults.
• Likely: a small effect on memory and processing speed, and a real effect on thinking during sleep loss.
• Unknown: whether the effect is big enough to notice in daily life, the best dose for the brain, and whether it helps aging brains or prevents decline.
• Didn’t hold up: a bigger brain benefit for vegetarians, and creatine as a treatment for depression on its own.

A 2026 review asked in its title why the strong theory hasn’t turned into convincing clinical evidence. The answer it gave is that little creatine gets into the brain and many of the trials were small.

Doses that have been studied

Lower doses of 4 to 5 g a day can raise brain creatine too, but it seems to take months (Antonio 2025). High-dose creatine covers what bigger doses do to your stomach.