There's a moment in most vegetarian or vegan diets where you start hearing the word "creatine" with suspicious regularity. A friend brings it up at the gym. A nutrition podcast slips it into the conversation between adverts. Someone on the internet, with a confidence that should probably make you nervous, insists you absolutely need it because you don't eat meat. And somewhere in there, a question wedges itself in and refuses to leave: is any of this actually true? Are people who skip animal products really running on lower creatine, and if so, does topping it up matter for anything beyond the gym?
The short answer, as it turns out, is yes to the first part and "probably more than you think" to the second. Creatine, despite its reputation as the bodybuilder's white powder of choice, is one of the most studied supplements on the planet, and a surprising amount of that research keeps pointing in the same direction: people who don't eat meat tend to start with lower stores, and they often respond more dramatically when those stores are topped up. Not just in the muscle. In the brain too. Which makes this a story worth telling properly, because the mental health angle has been quietly catching up with the sports nutrition one for years.
The molecule your brain is quietly hungry for
Creatine is a small, naturally occurring compound your body uses to recycle energy at speed. Every cell that does demanding work, your muscle fibres during a sprint, your neurons during a tricky mental task, runs on a molecule called ATP. ATP is the universal currency of cellular energy, but cells only carry a few seconds' worth at a time. Creatine, in its phosphorylated form (phosphocreatine), acts as a kind of rapid-recharge station: it donates a phosphate group to spent ATP and brings it back to life almost instantly. Think of it as a backup battery wired into the wall; the mains flickers under load, the battery covers the gap, and you never notice the brownout that almost happened.
About 95 percent of your body's creatine sits in skeletal muscle, which is why the gym crowd got there first. But the brain is no slouch in the creatine department either. It accounts for roughly 20 percent of your body's resting energy use despite being only 2 percent of your body weight, and it relies heavily on the same recycling system to handle bursts of cognitive demand. When researchers started measuring brain energy metabolism more carefully, creatine quietly stopped being just a sports nutrition story and started becoming a mental health one.
Where creatine comes from (and why your plate matters)
Your body produces creatine on its own, mostly in the liver and kidneys (and a bit in the pancreas), by stitching together three amino acids: glycine, arginine, and methionine. This endogenous production gives you roughly one gram a day. The rest, around another one to two grams in a typical omnivorous diet, comes from food. And here's the slightly inconvenient bit: creatine, in any meaningful concentration, is found almost exclusively in animal flesh. Red meat, poultry, and fish are the main delivery systems. Plants contain essentially none.
To give you a sense of scale, a serving of beef or salmon will hand you somewhere in the region of half a gram of creatine. Herring, oddly enough, is one of the richest sources known. According to a recent review of creatine intake across populations, omnivores in the U.S. consume around one gram of dietary creatine a day on average, though plenty get more. Vegetarians, in contrast, are usually pulling in around 0.03 grams a day. That's not a typo. It's roughly a fortieth of what meat-eaters average.
The body compensates, partially. Endogenous synthesis ramps up a touch when intake drops, and the kidneys hold on to creatine more efficiently. But compensation only goes so far. Which brings us to the first big finding.
The vegetarian and vegan creatine gap
When researchers actually measure the creatine sitting inside muscle tissue, the difference between meat-eaters and non-meat-eaters is consistent and substantial. Vegetarians and vegans tend to have intramuscular creatine concentrations roughly 10 to 30 percent lower than omnivores. This isn't a deficiency in any clinical sense; the body keeps things running. But it does mean your muscle's rapid-recharge station is operating with a smaller reserve, which has consequences when you ask it to do explosive work.
A foundational 2003 study by Burke and colleagues, published in Medicine & Science in Sports & Exercise, took eighteen vegetarians and twenty-four omnivores through eight weeks of resistance training, with half of each group getting creatine and half getting placebo. The baseline finding was straightforward: vegetarians started with significantly lower total muscle creatine. The interesting finding came later. After supplementation, the vegetarians showed bigger gains in muscle creatine, lean tissue, and total work performance than the omnivores who took the same dose. They didn't just catch up. In some measures, they pulled ahead.
The brain side of the story is messier but moving in a similar direction. A magnetic resonance spectroscopy study published in the British Journal of Nutrition tried to measure whether vegetarians had lower brain creatine and produced a slightly humbling result: total brain creatine looked broadly comparable between groups, suggesting the brain is rather good at making its own. Newer work, including studies using more sensitive techniques, has started to push back, finding that vegetarians and vegans do show lower creatine signals in some brain regions. The picture is still being worked out. What seems clear is that brain creatine is more tightly defended than muscle creatine, but it isn't immune.
What lower stores might mean for mood and mind
Here is where the mental health thread gets interesting. The brain, like the muscle, uses creatine to keep ATP cycling during high-demand moments. If you're sleep-deprived, mentally exhausted, or fighting through a depressive episode, that recycling system matters more, not less. And the working theory is that anything which puts the brain under bioenergetic strain might benefit from a fuller creatine tank.
The depression angle has been simmering for years. In 2024, a substantial review of creatine in depression published in PMC summarised the case: creatine appears to support brain energy metabolism in regions implicated in mood disorders, and small clinical trials have hinted at meaningful symptom reduction when creatine is added to standard antidepressants. A 2025 systematic review and meta-analysis published in the British Journal of Nutrition, pulling together eleven trials and over a thousand participants, found a small but statistically significant reduction in depressive symptoms. The authors were careful to note that the certainty of the evidence is still low, the studies vary a lot in quality, and the effect is modest. This isn't a cure. But it's a real signal, and one that keeps showing up.
The cognitive side has produced two of the most cited studies in the field, and both happen to have focused specifically on vegetarians. The first, by Rae and colleagues in 2003, gave forty-five young vegetarian adults either creatine or placebo for six weeks, then tested them on working memory and abstract reasoning. The creatine group scored meaningfully higher on both. The second, by Benton and Donohoe in 2011, compared meat-eaters and vegetarians directly. Creatine improved memory recall in vegetarians more than in omnivores. As the authors put it, the vegetarians appeared to be more sensitive to supplementation.
Layer onto this a 2024 study by Gordji-Nejad and colleagues, published in Scientific Reports, which gave participants a single large dose of creatine before keeping them awake for twenty-one hours. The creatine group held on to better working memory and processing speed, and brain scans showed their phosphocreatine and ATP levels stayed closer to normal. The implication is unsubtle: when the brain is asked to work harder with less fuel, having more creatine on hand seems to help. For anyone whose mental life involves stretches of bad sleep, hard thinking, or low mood, that's a finding worth filing away. (For more on how sleep loss erodes thinking, see our piece on deep sleep and why it matters.)
The strength and energy side of the story
Of course, creatine still does what it has always done in the gym. It topples nicely into anything explosive: lifting heavier weights, sprinting harder, recovering faster between sets. For vegetarians, the practical question isn't "does creatine work" but "does it work more for us than for everyone else", and here the evidence is largely encouraging if a touch uneven.
The Burke study mentioned earlier found exactly the response advantage you'd hope for. Vegetarians taking creatine plus resistance training gained more lean tissue and lifted more weight than omnivores on the same protocol. A 2020 systematic review published in the International Journal of Environmental Research and Public Health pulled together studies on creatine in vegetarian athletes and concluded the same thing: vegetarians tend to see greater performance benefits than omnivores, particularly for high-intensity, short-duration work.
That said, the evidence isn't unanimous. A 2025 study in Physiological Reports gave young vegans and vegetarians a week of creatine and confirmed the expected jump in muscle creatine, but didn't find a corresponding improvement in repeated sprint performance. Which is a useful reminder that biological response and visible performance gains aren't quite the same thing. Filling the tank is not the same as winning the race, especially in a one-week window. (If you're curious about what creatine does and doesn't do more broadly, our honest beginner's guide to creatine covers the basics.)
What the research actually says about non-meat-eaters as "responders"
When sports scientists talk about "responders" and "non-responders" to creatine, what they're really describing is how full your tank was to begin with. There's a ceiling. Muscle creatine tops out at around 150 to 160 millimoles per kilogram of dry muscle, no matter who you are. The difference is how far you have to travel to get there. An omnivore starting at around 125 has a relatively short trip. A vegetarian starting at 110 or even lower has further to go, which is precisely why their absolute increase, and often their measurable response, tends to be larger.
This isn't a quirky finding. It's a fairly elegant bit of biology. The body responds most to a nutritional intervention when the gap between where it is and where it could be is widest. Vegetarians and vegans are, in effect, walking around with the most room to gain. A 2025 narrative review in Nutrients examining creatine in vegans, women, and clinical populations made this point explicitly, framing non-meat-eaters as one of the most likely groups to benefit from supplementation across both physical and cognitive domains.
The brain version of the same idea is, for now, less rigorously established but plausible on the same logic. If brain creatine is lower in vegetarians (and the evidence on that is mixed but tilting in that direction), then topping it up should, in theory, produce a more noticeable change in the kinds of tasks that lean on brain energy: working memory, processing speed, performance under sleep loss, and possibly mood regulation. The Rae and Benton studies above suggest that prediction is roughly right.
What we still don't know
Now for the honest bit. The vegan and vegetarian creatine story is suggestive, repeatedly suggestive, but it isn't airtight. Several pieces of the puzzle are still loose.
First, sample sizes are often small. Rae's vegetarian study had forty-five people. Burke's had forty-two. Many of the brain studies sit in similar territory. Small studies are useful, but they can throw up false positives, and a finding that looks robust in one paper sometimes shrinks or vanishes in larger replications. The 2025 systematic review on depression flagged exactly this problem: real signal, low certainty, more big trials needed.
Second, the brain creatine measurements are technically hard. Magnetic resonance spectroscopy is a clever tool, but it has limits in resolution and reliability. The fact that one study finds comparable brain creatine in vegetarians and omnivores while another finds a meaningful difference probably reflects, in part, methodological differences in how the measurements were taken.
Third, the question of how much creatine the brain can store, and how easily oral supplementation gets across the blood-brain barrier, is still being worked out. Muscle creatine responds reliably to standard doses. Brain creatine responds more slowly, and possibly needs higher doses or longer supplementation periods to shift meaningfully. Studies like Gordji-Nejad's, which used a single large dose, are unusual; most cognition studies have used the more standard three-to-five grams a day for weeks at a time.
Fourth, the entire vegetarian and vegan category is broad. A long-term vegan who is also a strength athlete with a thoughtful protein strategy is in a very different metabolic position from someone who became vegetarian last month and lives largely on pasta. The research often lumps these together.
None of this undoes the central story. The trend across studies is that lower baseline equals bigger response, in both muscle and (probably) brain. But "probably" is the right word, and anyone telling you otherwise is selling something. Often, in fairness, literally.
So, should you think about it? Principles, not prescriptions
We're not in the business of giving medical advice here. What we can offer is the lay of the land, and a few principles worth holding in mind if you're a vegetarian or vegan weighing this up.
The first principle is that creatine has one of the strongest safety records of any widely used supplement. The International Society of Sports Nutrition's position stand reviewed decades of research and concluded that creatine monohydrate, used at standard doses, is well tolerated across healthy populations over both short and long terms. That doesn't mean it's right for everyone, and people with kidney disease or specific medical conditions should talk to a doctor first, but the "is it dangerous" question has a fairly clear answer for most healthy adults.
The second principle is that, if you're a vegetarian or vegan, the case for at least considering creatine is stronger than for the average omnivore. Not because there's anything wrong with a plant-based diet, but because the one thing meat reliably delivers that plants don't is creatine, and the research keeps pointing to non-meat-eaters as the group most likely to feel a meaningful response. Whether that response shows up in the gym, in your ability to think clearly when you haven't slept enough, or in subtle shifts in mood, is going to depend on you.
The third principle is that creatine is not a mental health treatment. It's a small nudge in brain energy metabolism that, for some people, seems to help on the margins. If you're struggling with depression, anxiety, or persistent low mood, the right move is to talk to a professional, not to reach for a tub of powder. (For a broader look at how creatine interacts with the brain specifically, our piece on creatine, mental health, and cognitive and mood benefits goes deeper into the mechanism.)
The fourth principle is the one that gets lost most often: dietary creatine is not a magic shortcut for vegetarians or vegans. If you decide to use it, treat it as one input among many. Sleep, protein intake, training, stress management, and time in nature do far more for your mental health than any single supplement. Creatine is a useful tool, not a foundation. And as our piece on brain fog and free radicals notes, the basics still beat the biochemistry tweaks.
The picture that emerges from the research is straightforward, if a bit unfashionable in either direction. Vegetarians and vegans probably do benefit more from creatine than people who already eat meat regularly, both in muscle and quite possibly in the brain. The evidence is strongest for physical performance and working memory, suggestive for mood and cognition under strain, and still being refined for the trickier brain measurements. The mental health implications are interesting and worth taking seriously, but they're not yet a sales pitch.
What it amounts to, if you're a vegetarian or vegan reading this in the supplement aisle, is something like: this is the rare case where the evidence quietly points your way, and the trade-off (low cost, well-studied safety, possible benefits across both body and brain) is unusually favourable. Whether you act on that is up to you. But you can at least make the decision knowing that the question you started with has a real answer, and it isn't the marketing one.
