Creatine isn't just for muscle: your brain runs on it too

La creatina no es solo para el músculo: tu cerebro también corre con ella

Illustrative image. Does not represent guaranteed results.

The battery you already carry

If you've heard of creatine, it was probably in a gym.

That reputation is earned: it's one of the most studied supplements that exists for strength and muscle mass. But the reputation turned out to be too small, and it left out the more interesting half of the story.

Because creatine isn't a sports product. It's a molecule your own body manufactures — roughly a gram a day, from three amino acids, in the liver, kidneys and pancreas. You get about as much again from food, mostly meat and fish. And some of all that ends up where almost nobody goes looking for it: inside your head.

That's the good news, and it's what this whole article rests on. We're not talking about adding something foreign to your body. We're talking about a system that already works in you, and the reasonable question of whether it can be helped along.

Why a muscle and a neuron want the same thing

To see why this makes sense, you have to look at what creatine actually does. And it's simpler than it sounds.

Your cells run on an energy currency called ATP. The trouble with ATP is that it stores terribly: a cell holds enough for a few seconds of hard work, no more. So it needs a way to recharge fast.

That way is creatine. Inside the cell it's held in a charged form, phosphocreatine, and when ATP runs down it hands over its charge in a fraction of a second. It doesn't make energy — it buffers it. Think of the difference between a wall outlet and a backup battery. The outlet supplies the flow; the battery covers the moment the flow falls short.

Now think about where else you'd want a backup like that. A muscle firing from a standstill, sure. But also a neuron — which works in bursts, fires thousands of times a second, and cannot afford a voltage drop.

The brain's numbers are wildly out of proportion, and they're worth seeing side by side:

An organ with that bill and almost no reserves of its own depends entirely on good buffering. Which is why "what if creatine helps the brain too?" isn't a marketing hunch. It's the question the mechanism itself asks you to ask.

And it has been asked — repeatedly, with control groups and placebos. Here's what came back.

The number: 16 trials, 492 people

In 2024, a team pulled together every randomized trial that had measured creatine and cognitive function in adults, published between 1993 and 2024. Sixteen trials made the cut, with 492 participants aged 20 to 76 — some healthy, some with a diagnosed condition. All of them had used the same form: creatine monohydrate, the ordinary cheap kind.

What they found, domain by domain:

• Memory: improved. A small effect, but solid and consistent across studies. It's the firmest result in the analysis.
• Attention time: improved. Participants held attention with less time cost.
• Processing speed: improved, and it was the largest effect of the lot — though also the most variable between studies.
• Global cognition and executive function: no change. Nothing showed up here. Said plainly.

That last line matters as much as the first three. Creatine does not make you generally smarter, and nobody should be selling you that. What improved were specific capacities — above all the ones that depend on how fast the brain gets something done. Which is exactly what you'd predict from a molecule that buffers energy and does nothing else.

The authors themselves rated their confidence in the memory finding as moderate, and in the rest as low, because larger studies are needed. We're repeating that in the same words they used, not in more enthusiastic ones.

Where the effect gets big

So far this all sounds modest. And here's where it gets interesting.

A year earlier, another meta-analysis had focused only on memory in healthy people: ten trials, eight with enough data to pool. The overall result was similar — a small, real improvement. But when they split the results by age, the average broke into two very different halves:

Dose didn't explain the gap. Neither did duration — the studies ranged from five days to 24 weeks. Not sex, not country. The only thing separating the two groups was age.

And that points to a simple explanation, which is the thread running through everything else you'll read here: creatine helps when the tank is low. If your buffering system is already full and working, adding more has little to do. If it's running short — through age, diet, lost sleep, illness — there's room.

It's not a new idea, and it's an awkward one for marketing. It means the product works best in exactly the people least likely to buy it.

And now the honest caveat about that number, because we owe it to you. It comes from a small subgroup with wide variation between studies, so the margin of error is broad. Nor is it the only possible reading: a 2026 systematic review focused on adults aged 55 and older was considerably more cautious — of the six studies it found, four were cross-sectional and the single randomized trial found no cognitive effect. We cover that in full, warts and all, in creatine and longevity. Both things are true at once: there is a signal, and it is not yet solid. We'd rather you heard that from us.

The vegetarian experiment

If the low-tank idea is right, there's one group where it should show up without waiting for old age: people who don't eat meat. Because dietary creatine comes mostly from meat and fish, anyone skipping both starts lower.

That was tested in 2003 at the University of Sydney, and it remains one of the most cited studies on the subject. 45 young vegetarian adults, crossover design — every person went through both creatine and placebo without knowing which, and neither did the researchers. Five grams a day for six weeks.

They measured two things: working memory (repeating strings of digits backwards) and reasoning (Raven's Advanced Progressive Matrices, a classic non-verbal intelligence test). Both improved on creatine, and the gap over placebo was clear and statistically emphatic.

The authors highlighted something that fits the mechanism exactly: both tests that improved are tests that depend on processing speed. The same pattern again. Not more capacity — faster access to it.

And be careful with the easy reading: this is not an argument against vegetarianism. It's an argument for knowing what your diet supplies little of and handling it deliberately. If you don't eat meat or fish, this is probably the most usable information in the whole article.

The sleepless night

There's another way to run the tank low, and it takes no years and no special diet. One bad night will do it.

Sleep loss throws off the brain's energetics: phosphocreatine falls, the environment acidifies, and mental performance goes with it. A German group asked the obvious question: if the problem is energetic, can creatine offset it?

The obstacle was real. The brain takes up creatine from outside only reluctantly, which is why it had always been assumed you'd need weeks of supplementation to move anything. So they tried something different: one single high dose — 0.35 grams per kilogram of body weight — across about 21 hours awake, with MRI scans and cognitive tests repeated through the night.

It worked, and it showed up in the scanner before it showed up on the questionnaire. With creatine:

• Markers of the brain's high-energy phosphates shifted, ATP among them.
• pH did not fall the way it did on placebo — the environment didn't acidify the same way.
• Cognitive performance improved and, once again, so did processing speed.

It's a small study, one night, with a dose far above anything anyone would take daily — for a 70-kilogram person that's nearly 25 grams at once. Don't read it as a protocol. Read it as the cleanest demonstration there is that none of this runs on faith: the effect has a measurable chemical signature, and it appears when the system is under strain.

Which, in passing, is no substitute for sleeping. Sleep is still the tool, and we cover it separately in sleep and longevity.

Why nothing happened in 67 healthy children

This is the study we most like telling you about, because it's the one that stops the exaggeration.

In Brazil, researchers gave creatine or placebo to 67 healthy children aged 10 to 12 for seven days, double-blind. They measured verbal learning and executive function. And in part of the group they also measured, by MRI, creatine inside the brain — in the prefrontal cortex, the hippocampus and the occipital lobe.

Result: nothing. No difference on the tests, no difference in brain creatine. In none of the three regions.

The authors' conclusion is the piece that organizes everything above: in this population, the brain meets its needs by making its own creatine, not by importing it from the diet. The tank was full. There was nothing to top up.

A young, well-slept, well-fed brain already has this system handled. That's good news about your biology, even if it's bad news for anyone trying to sell you the powder.

The muscle–brain axis

There's one last piece, and it's the most practical of all.

A 2026 review gathered what's known about creatine, exercise and aging around an idea the research has been sharpening for years: the muscle–brain axis. Muscle isn't just scaffolding. Put it to work and it releases signals that reach the brain and support plasticity.

What that review summarizes is consistent with everything above:

• In older adults, creatine combined with resistance training clearly improves strength, lean mass and functional capacity. That's the best-established part, and we cover it in full in creatine and longevity.
• On the cognitive side, improvements are modest — memory, speed, some executive function — and they show up mainly in people who started with low levels. The tank again.
• The proposed mechanism runs through energy metabolism, mitochondrial stability and antioxidant defense, reinforced by what exercise contributes on its own side.

It's a narrative review, not a trial: it summarizes and organizes, it doesn't prove. But the practical takeaway is clear enough. Creatine performs better with company than alone. If you want what genuinely pays off, the order is strength, protein and sleep first; creatine on top of that, not instead of it.

The doses the studies actually used

We're not going to hand you a personal protocol, because that depends on you and not on an article. But we can tell you what the evidence you just read actually used.

• The form: creatine monohydrate in every trial in the large meta-analysis. It's the most studied and the cheapest. The "upgraded" versions have nothing like this backing.
• The range: roughly 2 to 20 grams a day across the memory studies. The usual landing spot in the longer trials is at the low end of that range.
• The duration: 5 days to 24 weeks. In the memory analysis, duration didn't change the result — what changed it was age.
• The brain part: raising brain creatine is harder than raising muscle creatine. That's precisely why the sleep-deprivation study reached for a single very large dose.

And a reality note: creatine monohydrate is sold everywhere, without a prescription, for very little money. It isn't our product and we're not selling it to you. We're telling you because it's information you can use, and that's the job.

Where SCTS1 fits into this

Let's be clear about the boundary: creatine is an over-the-counter supplement. What we offer is something else — clinical supervision for the things that do require a physician.

SCTS1 works by telemedicine, in Spanish and English, in weight management with GLP-1, hormone health and peptide therapy. SCTS1 has GLP-1 programs with FDA-approved medications (Wegovy®, Foundayo™, Ozempic®) from $149/month, by telemedicine, in Spanish and English, with follow-up included.

That does connect to what you just read, for a concrete reason: when someone loses weight, part of what they lose is muscle unless somebody makes sure it doesn't happen. And muscle is the other end of the axis this article is about. Which is why in a serious program the conversation isn't only the dose — it's protein, strength and sleep too.

Eligibility is determined by medical evaluation. Individual results vary and are not guaranteed.

See how it works →

So your expectations are the right ones

Three things, said without drama, so what you expect resembles what the evidence showed:

One. The measured cognitive effects are small. Real, repeated across several studies and biologically sensible — but small. You are not going to feel your head change. What was measured were milliseconds and correct answers on tests, not a new life.

Two. The benefit is not evenly distributed. If you're over 65, if you don't eat meat or fish, or if you're in a stretch of poor sleep, you're in the group where something was seen. If you're young, sleep well and eat meat, the likely answer — based on the children's study and the young subgroup of the meta-analysis — is that you'll notice nothing. That isn't a flaw in the supplement; it's your system already being covered.

Three. Confidence in these results is moderate for memory and low for everything else, by the authors' own assessment. Bigger and longer trials are needed. We're telling you now so it doesn't surprise you if the number moves in two years.

What you can expect with reasonable confidence: that this is a molecule with decades of study and a good safety profile in healthy adults, that it's inexpensive, that what it does best is the muscle part — and that if what you want is a brain that works better twenty years from now, the heaviest levers are still moving, sleeping, eating enough protein and looking after your metabolic health. Creatine is a reasonable extra on top of that.

Who is this NOT for?

This section isn't negotiable, and we write it in full even though it doesn't sell.

• If you have kidney disease, reduced kidney function, or you're on dialysis. Creatine is processed and cleared through the kidneys, and this isn't a place to improvise: you talk to your physician first, not after.
• If you take medications that burden the kidneys — some anti-inflammatories taken continuously, certain diuretics, some antibiotics. It isn't an automatic no, but it changes the conversation.
• If you're pregnant, trying to conceive, or breastfeeding. It hasn't been studied enough in that situation. The honest answer is "we don't know," and that isn't something to gamble with.
• If you're under 18. The children's study found neither an effect nor a change in brain creatine, and there's no long-term data at that age. There's no reason to start.
• If what you're looking for is to treat cognitive decline, dementia or depression. Creatine is not approved for any of that and does not replace any treatment. If there's a symptom worrying you, that gets evaluated, not supplemented.
• If you're expecting it to replace exercise. Its best evidence is alongside resistance training. Alone it does less, and on the cognitive side the effect is modest even at best.
• If the water retention of the first few weeks or the digestive upset of large loading doses would bother you. Those are the usual effects, almost always mild, and they tend to settle — but if the scale affects your mood, it's worth knowing before you start.
• If what you're actually facing is something else. If your head has felt slow for months, the first thing to rule out isn't creatine: it's sleep, your thyroid, anemia, or a medication you're taking. We'll tell you that even if it means you buy nothing.

How it works at SCTS1

Here's the real order, no fine print.

SCTS1 does not prescribe or dispense medication. Once you start your program, a licensed physician reviews your case — habits, stress, sleep and medical history — and orders labs only if they consider it necessary. Eligibility is determined by medical evaluation. That's the order: you start, the physician reviews, and only then is it decided what's appropriate.

If you want to see what usually gets looked at and why, we explain it in what labs should I ask for.

And one more thing, because it's the one that defines us: if your case suggests that what you came looking for isn't what you need, we'll tell you — even if what you need is the cheapest option, or none.

Frequently asked questions

Does creatine actually do anything for the brain, or is it marketing?

It does something, but less than the marketing claims and in narrower areas. Across 16 randomized trials in 492 adults, memory, attention time and processing speed improved. Global cognition and executive function did not. The authors rate confidence in the memory finding as moderate and in the rest as low.

How much did the studies use?

Roughly 2 to 20 grams a day of creatine monohydrate, for anywhere from 5 days to 24 weeks. In the memory analysis, neither dose nor duration changed the result — age did. The regimen that applies to you is decided by someone who knows your case.

I'm vegetarian. Does it do more for me?

Probably yes, and it's the scenario with the best direct evidence. In 45 young vegetarians, 5 grams a day for 6 weeks improved working memory and a reasoning test versus placebo. Because dietary creatine comes mostly from meat and fish, people who eat neither start lower — and that's where the effect shows.

Does it help if I slept badly?

One study measured exactly that, using a single very high dose across 21 hours awake: it shifted the brain's energy chemistry, prevented the drop in pH, and improved processing speed. It's a small, single-night study with a dose far above normal daily use. It's a mechanism demonstration, not a recommendation — and it doesn't replace sleeping.

Is creatine bad for your kidneys?

In healthy adults, creatine monohydrate has a good safety profile and decades of study behind it. What it does do is raise blood creatinine, a marker used to estimate kidney function — so that number can look off without your kidneys being worse. It's worth mentioning you take it before bloodwork. And if you already have kidney disease, this gets discussed with your physician before you start.

Do I need a loading phase?

The studies were done both ways: high doses for a few days, and low doses for a long time. In the memory analysis, duration didn't change the result. Fast loading fills the store sooner and is also what causes the most digestive discomfort. It isn't mandatory.

Can I take creatine while I'm on a GLP-1 program?

That answer should come from the physician following you, because it depends on your case. What's worth saying here is why the question comes up so often: losing weight also costs muscle unless somebody attends to it, and creatine combined with resistance training is one of the best-evidenced tools for that specific problem. Raise it at your follow-up.

What if I'm young, sleep well and eat meat?

Then you most likely won't notice anything cognitively, and that's good news about your biology. In 67 healthy children, neither brain creatine nor test scores changed, and in the 11-to-31 subgroup of a meta-analysis the memory effect was essentially zero. A well-supplied brain makes its own. For strength and muscle mass, the story is different.

Sources

• Xu C, Bi S, Zhang W, Luo L. The effects of creatine supplementation on cognitive function in adults: a systematic review and meta-analysis. Front Nutr. 2024;11:1424972. — DOI
• Prokopidis K, Giannos P, Triantafyllidis KK, Kechagias KS, Forbes SC, Candow DG. Effects of creatine supplementation on memory in healthy individuals: a systematic review and meta-analysis of randomized controlled trials. Nutr Rev. 2023;81(4):416-427. — DOI
• Rae C, Digney AL, McEwan SR, Bates TC. Oral creatine monohydrate supplementation improves brain performance: a double-blind, placebo-controlled, cross-over trial. Proc Biol Sci. 2003;270(1529):2147-2150. — DOI
• Gordji-Nejad A, Matusch A, Kleedörfer S, et al. Single dose creatine improves cognitive performance and induces changes in cerebral high energy phosphates during sleep deprivation. Sci Rep. 2024;14(1):4937. — DOI
• Merege-Filho CAA, Otaduy MCG, de Sá-Pinto AL, et al. Does brain creatine content rely on exogenous creatine in healthy youth? A proof-of-principle study. Appl Physiol Nutr Metab. 2017;42(2):128-134. — DOI
• Li N. Creatine supplementation and exercise in aging: a narrative review of the muscle-brain axis and its impact on cognitive and physical health. Front Nutr. 2026;12:1687719. — DOI

Your trust is worth more than a sale.

More information →

This article is informational and is not medical advice. SCTS1 does not prescribe or dispense medication. All medical care, prescriptions and treatment plans are provided by licensed physicians through our partner platforms. Treatment eligibility is determined by a licensed provider through medical evaluation. Creatine monohydrate is an over-the-counter dietary supplement; it is not an FDA-approved drug for any cognitive indication, it is not intended to diagnose, treat, cure or prevent any disease, and SCTS1 does not sell or dispense it. The figures cited are averages from specific populations and are not a forecast for your case. If you have kidney disease, are pregnant or breastfeeding, or are under 18, consult a physician before using any supplement. Do not stop or change a medication without speaking to whoever prescribed it. Individual results vary and are not guaranteed.