Short answer: creatine is among the most heavily studied supplements in existence, and the safety record is good: the International Society of Sports Nutrition concluded that short and long-term use is safe and well tolerated in healthy people, including at doses far above what anyone normally takes. The two concerns people raise most, kidney damage and hair loss, are not supported. A twelve-week randomised trial published in 2025 measured hair follicles directly and found no effect. Three to five grams a day of creatine monohydrate is the standard dose, no loading phase required, and it works alongside training rather than instead of it.
Creatine sits in an odd position. It has more published research behind it than almost any other supplement, and it still carries a reputation for being vaguely risky.
That gap exists because most of the worries trace back to a small number of studies that measured something other than what people think they measured. This article goes through each concern, says what the evidence actually shows, and covers the practical questions about dose and timing.
One thing worth stating upfront: we do not sell supplements. This is not a product page.
What is creatine and what does it do?
Creatine is a compound your body already makes and stores, mostly in skeletal muscle, where it helps regenerate energy during short and intense efforts. You also get it from food, primarily red meat and fish.
The mechanism is straightforward. During a hard set or a sprint, your muscles burn through their immediate energy currency within seconds, and stored creatine phosphate helps rebuild it. More stored creatine means slightly more work before that system runs down.
Supplementing simply raises how much your muscles have stored. Most people sit well below saturation on a normal diet, which is why supplementing changes anything at all.
| Source | Rough creatine content | Amount needed for about 5 grams |
|---|---|---|
| Herring | highest of common foods | roughly 600 to 800 g |
| Beef | moderate | roughly 1.1 kg |
| Salmon | moderate | roughly 1.1 kg |
| Pork | moderate | roughly 1 kg |
| Plant foods | negligible | not achievable |
Approximate values from food composition data, and cooking reduces the content further. Included to show the scale, not as a dietary target.
That table explains the appeal. Reaching a supplemental dose through food alone means eating around a kilo of meat or fish every day, which is why a powder costing a few cents per serving became the default.
What does creatine measurably improve?
Creatine improves performance in short, high-intensity efforts, and through that it improves the training adaptations that follow. The International Society of Sports Nutrition position stand summarises this as consistently increased intramuscular creatine, which helps explain improvements in high intensity exercise performance and greater training adaptations.
The effect is real but worth keeping in proportion. Creatine lets you do slightly more quality work, and that extra work accumulates into more strength and muscle over months. It does not build anything by itself.
The same position stand notes evidence for post-exercise recovery, injury prevention, thermoregulation and rehabilitation, alongside a range of clinical applications under investigation.
If your training is not yet consistent or progressive, creatine is the wrong problem to solve first. Our article on progressive overload covers what actually drives the adaptation creatine supports.
Is creatine safe?
The evidence base here is unusually strong. The ISSN position stand concluded that short and long-term supplementation, at up to 30 grams per day for five years, is safe and well tolerated in healthy individuals and in a range of patient populations from infants to the elderly.
That ceiling deserves a moment. Thirty grams a day is roughly six to ten times a normal dose, sustained for five years, which is a far more demanding test than anything a typical user would apply.
A double-blind placebo-controlled study by Almeida and colleagues took a different approach, giving resistance-training men 0.3 grams per kilogram per day and then measuring 41 biochemical parameters in blood and urine. They found no changes in red or white blood cell profiles, blood lipids, metabolic or urine markers, or liver and kidney function.
None of this means creatine is right for everyone, and the section near the end of this article covers who should check with a doctor first.
Does creatine damage your kidneys?
In healthy people, no. This concern comes from a genuine misunderstanding rather than from evidence, and the misunderstanding is worth knowing about because it can affect your own blood tests.
Creatine is broken down into creatinine, which is the marker doctors use to estimate kidney function. Supplementing raises circulating creatinine somewhat, which can make a routine blood test look as though filtration has worsened when nothing has changed about your kidneys.
A review by Antonio and colleagues, examining the most common creatine misconceptions, addressed kidney damage directly among them and found the concern unsupported in healthy individuals. The Almeida trial reached the same conclusion using direct measurement of renal function.
The practical takeaway is not about your kidneys but about your paperwork: tell your doctor you take creatine before a blood test, so an elevated creatinine reading is interpreted correctly.
Does creatine cause hair loss?
No, and this is the clearest example of a myth outliving its evidence. The entire concern traces to one study.
In 2009, van der Merwe and colleagues gave twenty college-aged rugby players creatine for three weeks. Dihydrotestosterone rose by 56 percent after seven days of loading and remained 40 percent above baseline through the maintenance phase. Since dihydrotestosterone is involved in male pattern baldness, the inference spread quickly.
What that study did not do was measure hair. It measured a hormone, in twenty people, over three weeks, and the authors themselves called for further investigation rather than drawing conclusions about baldness.
That investigation has now happened. A twelve-week randomised controlled trial published in 2025 by Lak and colleagues gave 45 resistance-trained men 5 grams per day of creatine or a placebo, and assessed hair follicle health directly using a Trichogram test and the FotoFinder system, measuring hair density, follicular unit count and cumulative hair thickness. There were no differences between groups in dihydrotestosterone, in the DHT to testosterone ratio, or in any hair growth measure. The authors described it as the first study to directly assess hair follicle health and as strong evidence against the claim.
Does creatine make you hold water?
Creatine does draw water into muscle cells, and most people gain one to two kilograms in the first weeks. This is a real effect and worth expecting, but it is often described in a way that gets it backwards.
The water goes into the muscle rather than under the skin. It makes muscles look slightly fuller rather than puffy, which is close to the opposite of the bloating people picture.
The Almeida trial noted the expected increase in body weight alongside improved performance and no adverse findings across its biochemical panel.
One practical consequence: if you are tracking body fat percentage or weight during a fat loss phase, starting creatine at the same time will muddy your data for a few weeks. Start it before or after, not in the middle. Our article on lowering body fat without losing muscle covers how to keep those measurements reliable.
Does creatine work the same for women?
It works, and there is an argument that women may have more room to gain from it. A review by Smith-Ryan and colleagues on creatine across the female lifespan notes that women exhibit creatine stores roughly 70 to 80 percent lower than men.
For pre-menopausal women, that review found creatine supplementation effective for improving strength and exercise performance. For post-menopausal women, it reported benefits in skeletal muscle size and function at higher doses, with favourable effects on bone when combined with resistance training.
The same review flags that evidence in females remains understudied relative to males, which is a limitation rather than a reason for caution.
The practical answer is that the standard dose applies, and the concerns women most often raise about bulking up are not what creatine does.
Does creatine do anything for your brain?
The cognitive claims are more modest than the current enthusiasm suggests, but not empty. A 2024 systematic review and meta-analysis by Xu and colleagues pooled sixteen randomised trials covering 492 participants.
They found significant positive effects on memory, on attention time and on information processing speed. They found no significant improvement in overall cognitive function or in executive function.
The certainty of that evidence varies considerably. The authors graded the evidence for memory as moderate, and the evidence for processing speed, overall cognition, executive function and attention as low, calling for larger trials.
Subgroup analysis suggested larger benefits in people with existing disease, in the 18 to 60 age range, and in women. Treat brain benefits as a plausible bonus rather than a reason to start.
How should you take creatine?
Three to five grams of creatine monohydrate per day, every day, is the whole protocol. Antonio and colleagues describe the recommended dosage as 3 to 5 grams per day, or 0.1 grams per kilogram of body mass per day.
A loading phase is optional rather than necessary. Loading saturates your muscles in about a week instead of about a month, and the end point is identical either way.
| Loading phase | Straight to maintenance | |
|---|---|---|
| Dose | about 20 g per day, split into four servings, for 5 to 7 days, then 3 to 5 g | 3 to 5 g per day from the start |
| Time to full muscle saturation | about 1 week | about 3 to 4 weeks |
| Stomach upset | more likely at high single doses | uncommon |
| Best suited to | a specific date to be ready for | everyone else |
Timing within the day does not matter much, because the effect comes from saturation built up over weeks rather than from any single dose. Take it whenever you will actually remember.
Buy plain creatine monohydrate. It is the form used in the overwhelming majority of the research, and it is the cheapest.
Who should not take creatine?
Anyone with kidney disease, reduced kidney function, or a condition affecting how they process protein and its by-products should talk to a doctor before starting. The safety evidence above applies to healthy adults, and generalising it beyond that group is not justified.
The same applies if you are pregnant or breastfeeding, or taking medication that affects kidney function. Do not try to assess an interaction yourself from a web page, including this one. Ask a pharmacist or your doctor, who can look at your actual prescription.
For adolescents, the picture is more favourable than the reputation suggests but the decision should still involve a parent and ideally a doctor rather than being made alone.
And if you simply do not want to take a supplement, nothing here says you have to. Creatine improves a good training programme at the margins. It does not replace one.
Key points
- The ISSN concluded that up to 30 grams a day for five years is safe and well tolerated in healthy people.
- Creatine raises blood creatinine, which can make a kidney test look worse. Tell your doctor before a blood test.
- The hair loss concern came from one 20-person study that measured a hormone, not hair. A 2025 trial measured hair directly and found nothing.
- Three to five grams a day of plain monohydrate is the full protocol. Loading is optional and only changes how fast you saturate.
- Water goes into the muscle, not under the skin, but it will distort weight tracking for a few weeks.
Frequently asked questions
Why do some doctors still advise against creatine?
Caution from clinicians usually comes from three places: the supplement industry is poorly regulated and product quality genuinely varies, creatine interferes with the creatinine reading used to assess kidney function, and medical training covers supplements lightly. None of those is the same as evidence of harm, but the first two are legitimate practical concerns. Buying a product with third-party testing and mentioning your creatine use before blood work addresses both.
Do you need to cycle off creatine?
There is no evidence that cycling is necessary, and the practice appears to have carried over from how anabolic steroids are used, which creatine is not. Your body continues producing its own creatine while you supplement, and production returns to normal after you stop. If you stop, muscle stores gradually return to baseline over roughly four to six weeks and you lose the associated water weight along with them.
Can you take creatine if you are on medication?
This is a question for a pharmacist or your doctor rather than an article, because the answer depends on the specific medication and on your kidney function. The category that warrants the most care is anything affecting the kidneys, including some blood pressure medications and anti-inflammatories. Bring the actual product to the conversation, since a pharmacist can check the interaction in seconds.
Does creatine work better if you are vegetarian or vegan?
Vegetarians and vegans typically start with lower muscle creatine stores, since the dietary sources are almost entirely meat and fish, and the research generally shows a larger response in people who start lower. That makes creatine one of the few supplements with a genuinely stronger case for plant-based eaters than for anyone else. The dose is the same, and monohydrate powder is not derived from animals.
Are the more expensive forms better than monohydrate?
Creatine hydrochloride, ethyl ester, buffered versions and liquid forms are all marketed as improvements, and none has shown a meaningful advantage over monohydrate in the research. Monohydrate is the form used in the large majority of published studies, which means its safety and effectiveness are the best documented. Paying more usually buys a better label rather than a better result.
Want to check whether your training and nutrition already cover the basics before thinking about supplements? Read how much protein you need or book a free intake session.
Sources
Scientific claims in this article were verified via PubMed.
- Kreider RB, Kalman DS, Antonio J, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr. 2017;14:18. DOI
- Antonio J, Candow DG, Forbes SC, et al. Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? J Int Soc Sports Nutr. 2021;18(1):13. DOI
- Lak M, Forbes SC, Ashtary-Larky D, et al. Does creatine cause hair loss? A 12-week randomized controlled trial. J Int Soc Sports Nutr. 2025;22(sup1):2495229. DOI
- van der Merwe J, Brooks NE, Myburgh KH. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clin J Sport Med. 2009;19(5):399-404. DOI
- Smith-Ryan AE, Cabre HE, Eckerson JM, Candow DG. Creatine supplementation in women's health: a lifespan perspective. Nutrients. 2021;13(3):877. DOI
- Almeida D, Colombini A, Machado M. Creatine supplementation improves performance, but is it safe? Double-blind placebo-controlled study. J Sports Med Phys Fitness. 2020;60(7):1034-1039. DOI
- 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
