Creatine: Does It Work, and Does It Cause Hair Loss?

Last reviewed: 31 October 2026 · Written by SD, pharmacist · No products were supplied and no commission is earned from this review.

The short answer

Creatine monohydrate is one of the very few supplements where the evidence matches the reputation. Dozens of randomised trials and several meta-analyses show that, combined with resistance training, it increases strength and lean muscle mass more than training alone. The benefit is real but modest: it helps you get more out of training; it doesn’t replace it.

The popular worries hold up poorly. A small direct trial found no hair-loss signal over 12 weeks; it cannot exclude uncommon or longer-term effects. Kidney trials are generally reassuring in healthy adults at studied doses, but creatinine changes still need proper clinical interpretation. The main practical downsides are a small amount of water weight and occasional stomach upset at high doses.

How does it work?

Your muscles store creatine as phosphocreatine, a rapid back-up energy source for short, intense efforts such as a heavy lift or a sprint. Your body makes about 1 g of creatine a day, and meat and fish supply roughly another 1–2 g. Supplementing tops up muscle stores by around 20–40%, which lets you squeeze out a little more work in each training session. Over weeks, that extra work adds up to greater gains.^[1] People who eat little or no meat start with lower stores and tend to respond more.

The brain also uses creatine, which is why researchers are studying it for memory and fatigue. But supplements raise brain creatine much less than muscle creatine.^[9]

What the human trials show

Strength and muscle

Meta-analysis	Who	Main finding (creatine + training vs. training + placebo)
Wang 2024[2]	23 RCTs, adults under 50	About +4.4 kg more upper-body and +11.4 kg more lower-body strength. Clear gains in men; gains in women were not statistically significant (few female studies).
Chilibeck 2017[3]	22 RCTs, 721 older adults (mean age 57–70)	About +1.4 kg more lean tissue mass, plus greater chest-press and leg-press strength. Lean mass includes water and is not all newly built muscle.
Burke 2023[4]	10 RCTs measuring muscle size directly (MRI/ultrasound)	A small extra increase in muscle thickness (about 0.1–0.16 cm). Real but modest.

Pharmacist’s take: the consistency is what earns the A. Different research groups, populations and methods all point the same way. Keep the size in perspective: the extra gain is small compared with what consistent training and adequate protein deliver. Most trials are in men, so the evidence for women is thinner, and a nonsignificant female subgroup does not establish a true difference between sexes.

Brain and memory

A 2024 meta-analysis of 16 small trials (492 people) found a small improvement in memory (SMD 0.31) and processing speed, but no improvement in overall cognition or executive function.^[5] A 2026 review in older adults found mostly positive signals, but four of its six studies were observational and only two were randomised trials.^[6] Another systematic review concluded the results were “somewhat equivocal”.^[9] This is promising, not proven. It may matter more in people under stress, such as during sleep deprivation, or with low dietary intake.

Does creatine cause hair loss?

This fear comes from a single 2009 study of 20 rugby players. DHT, a hormone linked to male-pattern baldness, rose after a creatine loading phase.^[7] That study did not measure hair, and the finding was never replicated. In 2025, a 12-week trial randomised 45 resistance-trained men; 38 completed it. Participants received 5 g a day of creatine or placebo. It found no difference in DHT, the DHT-to-testosterone ratio, hair density, follicle counts or hair thickness.^[8] The trial was small and short, and did not assess family history of hair loss. It provides reassuring direct evidence at 5 g/day over 12 weeks, rather than proof that every dose is risk-free for every person over years.

Monohydrate vs. “advanced” forms

Form	Evidence	Verdict
Creatine monohydrate	Used in almost all of the research	The default choice: proven, cheap, stable as a powder
Micronised monohydrate	Same molecule, finer powder	Mixes more easily; no proven extra benefit
Creatine HCl, ethyl ester, buffered (Kre-Alkalyn), nitrate	Few trials; none clearly better than monohydrate[10]	Usually more expensive, with no added benefit shown
Gummies and ready-to-drink liquids	Stability and dose delivery depend on formulation, storage and product quality; direct outcome evidence is much stronger for monohydrate powder	Check the dose and testing carefully

Safety and interactions: a pharmacist’s checklist

• Kidney blood tests: creatine is converted to creatinine, the marker used to estimate kidney function. A 2026 meta-analysis of 20 randomised trials found creatine raised blood creatinine slightly (about 0.13 mg/dL) without changing eGFR or urea, which is reassuring but does not prove absence of kidney harm in every population or over many years.^[11] But a higher creatinine can be misread as reduced kidney function. Tell your doctor you take creatine before blood tests. Do not dismiss an abnormal result or stop supplementation solely to alter a test without discussing it with your clinician; they may use cystatin C or other assessments when appropriate.
• Existing kidney disease: trials have mostly involved healthy people. If you have kidney disease, or take medicines that can stress the kidneys, check with your doctor first. Examples are regular high-dose anti-inflammatories (NSAIDs), lithium and some antibiotics or chemotherapy drugs.
• Water weight: expect about 1–2 kg of extra water stored in muscle in the first weeks, especially with a loading phase. This is not fat gain; early weight changes mainly reflect fluid retention. It can matter for weight-class athletes.
• Stomach upset: more likely with large single doses (10 g or more). Splitting doses or skipping the loading phase usually fixes it.
• Dehydration and cramps: evidence does not support the old claim that creatine causes either.^[10]
• Not suitable without medical advice for: people who are pregnant or breastfeeding (too little research), children and teenagers outside supervised sport programs, and anyone with kidney or liver disease.
• Long-term use: studies of up to 5 years in healthy people and patient groups have found it well tolerated at normal doses.^[1] Note that some authors of creatine position statements have industry links, so independent long-term data remain valuable.

Who might reasonably take it?

• Good candidates:
  • Adults doing regular resistance or high-intensity training who want a small extra edge.
  • Older adults doing strength training to protect muscle mass.
  • Vegetarians and vegans, who start with lower creatine stores.
• Typical use in the trials:
  • 3–5 g a day of creatine monohydrate, at any time of day, with or without food.
  • A loading phase (about 20 g a day split into four doses for 5–7 days) fills muscles faster, but isn’t necessary. 3–5 g a day reaches the same level in about 3–4 weeks.
  • Take it consistently. Timing matters much less than taking it daily.
• Probably not worth it: if you don’t do any resistance or high-intensity exercise. The muscle benefits depend on training.
• Talk to your doctor or pharmacist first if you:
  • Have kidney disease or diabetes affecting the kidneys.
  • Take medicines that affect the kidneys.
  • Are pregnant or breastfeeding.
  • Are under 18.

How to judge a creatine product

We don’t recommend specific brands. Instead, check any product against these criteria:

• Plain creatine monohydrate as the only active ingredient, with no “proprietary blend”.
• Dose clearly stated: 3–5 g of creatine per serve.
• Independent testing: look for Informed Sport, NSF Certified for Sport or a published certificate of analysis. This matters especially for athletes subject to drug testing, because sports supplements can be contaminated.
• Powder over gummies or liquids, unless the product shows independent testing of the actual creatine content.
• Price per gram of creatine: monohydrate is inexpensive. Paying more does not establish greater effectiveness.

Our evidence grade

Claim	Grade	Why
Increases strength and lean mass with resistance training	A: strong	Multiple consistent meta-analyses of RCTs, in younger and older adults
Improves memory or cognition	C: limited but promising	Small trials, mixed results, mostly small effects
Causes hair loss	Not supported	One small trial found no significant hair changes over 12 weeks; longer-term uncertainty remains
Damages healthy kidneys	Not supported	Trials are generally reassuring at studied doses in healthy adults; creatinine can rise, and long-term and kidney-disease data remain limited

How we grade the evidence → · More reviews: vitamin D: who benefits? · magnesium glycinate for sleep · zinc for colds

References

1. 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:10.1186/s12970-017-0173-z
2. Wang Z, Qiu B, Li R, et al. Effects of creatine supplementation and resistance training on muscle strength gains in adults <50 years of age: a systematic review and meta-analysis. Nutrients. 2024;16(21):3665. doi:10.3390/nu16213665
3. Chilibeck PD, Kaviani M, Candow DG, Zello GA. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access J Sports Med. 2017;8:213–226. doi:10.2147/OAJSM.S123529
4. Burke R, Piñero A, Coleman M, et al. The effects of creatine supplementation combined with resistance training on regional measures of muscle hypertrophy: a systematic review with meta-analysis. Nutrients. 2023;15(9):2116. doi:10.3390/nu15092116
5. 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:10.3389/fnut.2024.1424972
6. Marshall S, Kitzan A, Wright J, et al. Creatine and cognition in aging: a systematic review of evidence in older adults. Nutr Rev. 2026;84(2):333–344. doi:10.1093/nutrit/nuaf135
7. 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:10.1097/JSM.0b013e3181b8b52f
8. 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:10.1080/15502783.2025.2495229
9. McMorris T, Hale BJ, Pine BS, Williams TB. Creatine supplementation research fails to support the theoretical basis for an effect on cognition: evidence from a systematic review. Behav Brain Res. 2024;466:114982. doi:10.1016/j.bbr.2024.114982
10. 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;18:13. doi:10.1186/s12970-021-00412-w
11. Tsiaras A, Loufopoulos G, Theodoridis X, et al. The effect of creatine supplementation on kidney function: a systematic review and meta-analysis of randomized controlled trials. J Ren Nutr. 2026. doi:10.1053/j.jrn.2026.04.010

This article is general educational information, not personal medical advice. Talk to your doctor or pharmacist before starting a supplement, especially if you take regular medicines, have kidney disease, are pregnant or breastfeeding, or are under 18. Evidence for Supplements does not accept payment or free products from supplement manufacturers for reviews.

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