Creatine for Your Brain: The Gym Supplement Hiding a Cognitive Upside

Creatine has a gym-bro reputation. But it’s also one of the most-researched supplements in existence, it’s cheap, and it has a growing body of evidence for something most people don’t associate it with: your brain.

Why the brain cares about creatine

Your brain is about 2% of your body weight but uses roughly 20% of its energy. Creatine helps recycle ATP, the cell’s energy currency, quickly. Supplementing raises creatine stores in muscle a lot and in the brain more modestly. The theory is that a bigger energy buffer helps when the brain is under pressure.

What the evidence shows

A systematic review of trials in healthy people found creatine may improve short-term memory and reasoning, with less clear effects on other areas (Avgerinos et al., 2018). The benefits seem to be concentrated in particular groups.

1. Vegetarians and vegans

Meat and fish are the main dietary sources of creatine, so people who don’t eat them start lower. In a placebo-controlled trial, vegetarians taking 5 g a day for six weeks improved on tests of working memory and reasoning (Rae et al., 2003). Another study found memory benefits mainly in vegetarians compared with meat-eaters (Benton & Donohoe, 2011).

2. When you’re sleep-deprived

This is where creatine looks most interesting for productivity. Studies have found creatine can reduce the drop in cognitive performance and mood that comes with sleep deprivation (McMorris et al., 2006). More recent work with a single large dose found similar protective effects during a night without sleep (Gordji-Nejad et al., 2024).

3. Older adults

Some trials show benefits in older people, whose creatine levels tend to fall with age.

For well-rested meat-eaters?

Effects are smaller and less consistent. Creatine isn’t a “feel it in an hour” supplement. Think of it as cognitive insurance, a buffer for the days when you’re short on sleep or under heavy load.

How to take it

• Form: creatine monohydrate. It’s the most studied and the cheapest. Fancier forms (HCl, buffered, “ethyl ester”) have no proven advantage.
• Dose: 3 to 5 g a day, every day, at any time. Consistency matters, not timing.
• Loading phase: optional. Taking 20 g a day (split into four doses) for 5 to 7 days saturates faster, but plain 3 to 5 g gets you there in about 3 to 4 weeks.
• Mix it into water, coffee, a smoothie, anything. Creatine monohydrate is tasteless. (It’s not a good fit for pouches; the dose is far too big.)
• Look for third-party tested products (e.g. Informed Sport), especially if you compete in drug-tested sport.

Safety

Creatine has been studied for decades, including long-term trials, and is considered safe for healthy people at normal doses.

• Water weight: you may gain 0.5 to 2 kg, mostly water held in muscle.
• Blood tests: creatine can raise creatinine on a blood test, which can look like a kidney problem when it isn’t. Tell your doctor you take it.
• Kidney disease: if you have any kidney condition, speak to your doctor first.
• Stomach upset: usually only with large single doses. Split it up if needed.

The verdict

For vegetarians, vegans, older adults and anyone regularly short on sleep, creatine is one of the best-value cognitive supplements there is. For everyone else, it’s cheap insurance with excellent safety data. It’s graded B in our Supplement Index.

References

General information, not medical advice. Supplements and stimulants affect people differently, so check with a GP or pharmacist before starting anything new, especially if you're pregnant, breastfeeding, on medication or have a health condition.