Dr. Rhonda Patrick on why the most researched supplement in sports science is now the most interesting supplement in neuroscience — and why the dose most people take is too low to reach the brain.
5 min read · Based on Dr. Rhonda Patrick, biomedical scientist and researcher
TL;DR
Creatine has been used by athletes for decades. The muscle research is settled — it works, with resistance training, by helping the body regenerate energy faster. What has changed in the last five years is the brain research. The dose that reaches the brain is double what most people take. At higher doses, it reverses cognitive deficits from sleep deprivation, outperforms CBT alone for depression, and a 2025 study of 25,000 people links it to a 14% reduction in cancer risk. The hair loss concern traces to a single unreplicated study from 2009. The bloating concern is not supported by evidence.
“If you’re the perfect person — no stress, perfect sleep every night — your brain makes enough creatine on its own. I don’t know anyone like that.”
1. Your muscles are consuming almost all of it.
The body produces 1 to 3 grams of creatine daily, primarily in the liver. The brain also synthesises its own supply. But creatine is distributed across all tissues — and muscle is by far the largest consumer. Stored as phosphocreatine, it is used to regenerate ATP rapidly during physical effort. This is the mechanism behind creatine’s training benefits: faster energy regeneration means more reps completed, shorter recovery between sets, and greater total training volume. The downstream effect of increased training volume is increased strength and lean mass. With resistance training, the effect is real and well-documented. Without it, creatine by itself does nothing to build muscle — it supports energy production, not growth.
At 5 grams per day, the standard supplementation dose, muscles consume essentially all of it. In people who are training regularly, the muscular demand is high enough that almost nothing reaches the brain.
2. 10 grams is where it begins to cross into the brain.
A study out of Germany measured creatine concentrations across multiple brain regions in people supplementing at different doses. At 5 grams per day, muscle saturation occurred with minimal detectable change in the brain. At 10 grams per day, creatine levels increased measurably in several distinct brain regions. This is the research basis for doubling the standard dose if cognitive function is the goal — not just training performance.
The brain uses creatine the same way muscle does: to regenerate energy faster under demand. What counts as demand for the brain is different. Sleep deprivation is demand. Chronic psychological stress is demand. Sustained cognitive load — learning, complex problem solving, memory consolidation, long periods of focused work — is demand. Depression, neuroinflammation, and neurodegenerative disease all represent states where the brain’s energy systems are under pressure and where creatine availability becomes a limiting factor.
The OMNIFIT angle: The Cognitive dimension in OMNIFIT Daily — deep work, language learning, memory practice, focused reading — creates exactly the kind of sustained demand where brain creatine availability matters. This is why nutrition and supplementation sit within the Lifestyle layer of the OMNIFIT system: what you put in determines how effectively the Cognitive block can run.
3. Under sleep deprivation, a high acute dose reverses cognitive deficits entirely.
Research by Dr. Darren Candow at the University of Regina found that subjects sleep-deprived for 21 hours who received 25 to 30 grams of creatine not only had their cognitive deficits fully reversed — they outperformed well-rested controls who received no creatine. The brain under sleep deprivation is running on depleted energy reserves. A high acute dose of creatine appears to compensate directly for that depletion.
The practical application is specific. This is not a replacement for sleep. It is a genuine intervention for unavoidable high-demand situations — jet lag, early presentations, demanding days following poor rest, travel across time zones. The standard 5 gram maintenance dose does nothing in this context. The dose that matters acutely is several times higher, taken on the day it is needed.
4. The hair loss concern traces to one unreplicated study. The cancer finding points the other direction.
The hair loss association comes from a single 2009 study of rugby players given 25 grams of creatine per day, which showed elevated dihydrotestosterone — a hormone linked to androgenic hair follicle miniaturisation. The study never measured actual hair loss. It has never been replicated despite being available for replication for over 15 years. A randomised controlled trial published in 2025 with 45 resistance-trained men given 5 grams daily over 12 weeks found no significant difference in hair outcomes or DHT levels compared to placebo. The concern is not supported by the current evidence.
In the opposite direction: a 2025 study of 25,000 people found that each additional 0.09 grams of creatine intake over a two-day average was associated with a 14% reduction in cancer risk, published in Frontiers and reported by the BBC. The mechanism is not yet understood — possibly related to anti-inflammatory effects that have been observed in animal studies. The field is early. But the directional finding runs entirely opposite to the concern most people carry about creatine and health risk.
A separate 2025 study found that creatine supplementation alongside cognitive behavioural therapy produced greater improvement in depression symptoms than CBT alone. Depression represents chronic brain stress — elevated inflammation, elevated oxidative stress, impaired energy metabolism. Creatine’s ability to support energy production under stress conditions appears to extend into this territory.
5. Water retention is real, small, and intracellular.
Creatine draws water into muscle cells. This is an intracellular effect — it is not subcutaneous bloating and it does not produce visible puffiness. The weight change from this effect, if any, is typically under one kilogram. It reverses when supplementation stops. Normal hormonal fluctuation across a menstrual cycle produces comparable or greater water weight changes. The concern that creatine causes significant weight gain or bloating is not consistent with the evidence.
One thing to do this week
If you are currently taking 5 grams of creatine daily, add a second 5-gram dose at a different time of day. Run that for two weeks and notice any difference in afternoon energy and cognitive endurance during demanding work blocks.
If you are not supplementing: 5 grams daily is the starting point. It can be taken at any time of day, with or without food, with or without training. Creatine monohydrate is the form with the most research behind it and is also the cheapest. No loading phase is required if you are not preparing for a competition — saturation occurs within a month at 5 grams daily.