Open Instagram or TikTok for thirty seconds and you'll be told creatine is a memory miracle. It's the supplement of the moment and the marketing has raced miles ahead of the evidence.
Creatine is one of the best-studied supplements we have. But almost everyone blurs two very different questions: does it reach your brain, and does it make you think better? Watch the quick explainer:
The Key Takeaways
Creatine has not been shown to make you think better. When EFSA reviewed 23 human trials in 2024, it concluded a cause-and-effect link with cognition is not established.
Your brain largely makes its own creatine. Only ~5% of the body's 120–140 g pool sits in the brain, and the blood-brain barrier limits how much creatine you supplement from entering the brain.
The largest, most rigorous trial came up empty. Sandkühler's pre-registered 2023 study (n=123) found working memory only borderline (p=0.064) and no benefit across eight other cognitive tests.
Exercise is the intervention with overwhelming evidence. A 2025 umbrella review pooled 133 reviews, 2,724 trials and 258,279 people and found real cognitive gains; a year of walking grew the hippocampus (memory) 2%.
If you take creatine, take it for muscle — not IQ. 3–5 g a day supports strength and lean mass when paired with resistance training, which is a very different claim than "brain booster."
Want to know the science? Keep reading below 👇
Does creatine even reach your brain?
Yes, but barely, and slowly. Here's the part most coverage skips: your brain manufactures most of its own creatine. There is a structure called the blood- brain barrier which protects the brain and it is this barrier that limits creatine that is supplemented from entering the brain. That's why supplementing moves brain levels so little while muscle fills up easily.
How little? When Turner and colleagues analyzed the same brain scans two ways in 2015, one method showed a ~6% rise after a week of heavy loading and the other showed no change at all (Magnetic Resonance Imaging). A 2017 analysis (Bhogal, NMR in Biomedicine) showed even the same software gives different answers depending on the settings. Brain creatine probably does rise a little, but the magnitude is small and genuinely uncertain.
Does it actually make you think better?
We don't know yet. Two of the most authoritative reviews of 2024: the European Food Safety Authority (EFSA) and a systematic review by McMorris (Behavioural Brain Research) both concluded the cognitive benefit is not established.
The field is stuck for a simple reason: studies that measured brain creatine almost never measured cognition, and studies that measured cognition almost never measured brain creatine. The dots have never been connected. And the largest, most careful trial by Sandkühler 2023, which included 123 people tried to replicate an earlier positive result and couldn't. Working memory came back borderline and not significant; the other eight tests didn't budge (BMC Medicine).
Then why do some studies look positive?
There are real positive signals but they are small and inconsistent. Rae's 2003 study in 45 vegetarians found gains in working memory (Proc. Royal Society B); McMorris found memory gains in 32 older adults in 2007. But the longest single trial in older women (Alves, 24 weeks) found no cognitive benefit at all (PLoS ONE).
What actually works for your brain?
Aerobic exercise, and it isn't close. In 2025, Singh and colleagues published an umbrella review, which was a meta-analysis of meta-analyses. The study pooled 133 systematic reviews, 2,724 randomized trials and 258,279 people, and found a real, measurable improvement in cognition (British Journal of Sports Medicine).
In addition, the Erickson's 2011 trial, a year of moderate walking grew the hippocampus, the brain's memory hub, by 2%, while the control group's shrank ~1.4%, effectively rolling back one to two years of brain aging (PNAS). Compared with creatine's few trials that cumulatively included a few hundred participants, exercise has more than two hundred times the evidence.
Bottom Line
Creatine is not a proven brain supplement. The cognitive benefit has not been established in humans.
Biology explains why. Your brain makes most of its own creatine and the blood-brain barrier blocks most of the rest. Creatine supplementation barely moves the needle up top.
The best trial was null. Sandkühler 2023 (n=123) found no reliable cognitive gain.
Exercise is the real lever. 150 minutes a week of moderate aerobic activity has orders of magnitude more evidence for your brain than any supplement.
You probably have a parent, spouse, or friend who bought creatine for their brain. Share this with them.
Catch up on the rest of the series
Next week: creatine for muscle: who's actually low, what it really does, and exactly how much you need (it's less than the internet says).
References
Turner et al., Magn Reson Imaging 2015 · Bhogal et al., NMR Biomed 2017 · EFSA NDA Panel, EFSA Journal 2024 · McMorris et al., Behav Brain Res 2024 · Rae et al., Proc R Soc B 2003 · McMorris et al., Aging Neuropsychol Cogn 2007 · Sandkühler et al., BMC Medicine 2023 · Alves et al., PLoS ONE 2013 · Singh et al., Br J Sports Med 2025 · Erickson et al., PNAS 2011.