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▸ Creatine · Safety

Creatine Side Effects: Real vs. Myth

Creatine is one of the most-studied supplements on earth — and one of the most feared, mostly for reasons the research doesn't support. Here is every claimed side effect, checked against the evidence.

Updated June 2026 · 27 peer-reviewed sources · Free to cite (CC BY 4.0).

27 sources — every figure verified on PubMedIndependent — we sell our own creatine, but the scores follow the dataReviewed June 2026 · Methodology

Is creatine safe? The bottom line

30 g/day
for up to 5 years — longest documented safe dose in healthy adults
0
studies showing kidney or liver harm in healthy people
0
studies that have ever shown actual hair loss
Not a
steroid or hormone — and it doesn't raise testosterone

In healthy people, creatine monohydrate shows no measurable harm to the kidneys or liver, even at high doses and long durations[1,2]. The longest controlled use studied is up to 30 g/day for five years[1]. Most "side effects" you've heard about are either misread lab markers or myths the trials simply don't support — here's each one.

▸ The creatine safety scorecard

We checked every claimed side effect against the published trials. The result:

8 / 8
common creatine myths the evidence debunks
0
studies that have ever shown actual hair loss
5 yrs
longest proven-safe use — 30 g/day, no harm in healthy adults
Our own analysis · free to cite with attribution

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Kidneys & the creatinine myth

Creatine does not damage healthy kidneys. Pooled meta-analyses of renal function find no effect on kidney markers in healthy people[13,14]. The confusion comes from one lab value: creatine slightly raises blood creatinine, a normal by-product of creatine metabolism. On a standard eGFR test that can look like reduced kidney function — but it is a measurement artefact, not injury[2,14]. If you're getting a kidney panel, tell your doctor you supplement creatine.

Does creatine cause hair loss?

There is no evidence that creatine causes hair loss. The fear traces to a single 2009 study in 20 college rugby players that found creatine raised the DHT-to-testosterone ratio (DHT rose about 56% at 7 days)[9]. But that study never measured hair — only a hormone ratio — has never been replicated, and no study in the years since has ever reported actual hair loss or baldness from creatine[2]. It is the single most-misquoted creatine statistic.

Water retention & "bloating"

Early creatine use can add about 1–2 kg of scale weight in the first week — but it is water drawn into the muscle cells (intracellular), not subcutaneous bloat, and it normalizes relative to muscle mass over time[2]. It's a sign the muscle is loading, not a side effect to fear.

Cramps, dehydration, liver & "is it a steroid?"

Cramps & dehydration: not supported by controlled trials — if anything, creatine may aid hydration and thermoregulation[14,1]. Liver: no harm at recommended doses in healthy people[1]. Is it a steroid?No — creatine is an amino-acid-derived compound found in meat and fish, not a hormone, and it doesn't raise testosterone[2,14]. Cancer: no link has been found[14].

Who should be cautious

The safety record is for healthy adults. People with pre-existing kidney disease, and those who are pregnant or breastfeeding, should consult a clinician before supplementing — not because harm has been shown, but because these groups are understudied[14].

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Myths vs. facts

The mythWhat the evidence showsSource
Creatine makes you bloated Early water gain is intracellular (inside the muscle), not subcutaneous bloat, and normalises over time.[2]
Creatine damages your kidneys No kidney-function harm in pooled RCTs in healthy people; the small rise in blood creatinine is a marker artefact, not injury.[13,14,2]
Creatine causes hair loss The one DHT study never measured hair, hasn't been replicated, and no study has ever shown actual hair loss.[9,2]
You must load creatine Loading is optional — 3–5 g/day fully saturates muscle in about 3–4 weeks.[2,1]
Creatine isn't for women Equally effective and safe for women at the same 3–5 g/day (≈0.1 g/kg/day).[2,1]
You get enough from food Diet supplies only ~1–2 g/day (≈1 kg of red meat ≈ one dose) and cooking degrades it — supplementing is the practical route to saturation.[1]
Creatine is a steroid It is not a hormone or anabolic steroid and does not raise testosterone.[2,14]
A fancier form works better No buffered, ethyl-ester or HCl form has out-performed plain monohydrate.[15,16,1]
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Frequently asked questions

Does creatine damage your kidneys?

No. Pooled randomized trials show no harm to kidney function in healthy people, even at high doses and over years. The small rise in blood creatinine after starting creatine is a by-product of creatine metabolism — a measurement artefact, not kidney injury. People with pre-existing kidney disease should consult a clinician first.

Does creatine cause hair loss?

There is no evidence it does. The fear comes from one small 2009 study in rugby players that found a shift in the DHT-to-testosterone ratio — but it never measured hair, has never been replicated, and no study has ever reported actual hair loss or baldness from creatine.

Does creatine make you bloated or gain weight?

Creatine can add roughly 1–2 kg of scale weight in the first week, but it is water pulled into the muscle cells (intracellular) — not subcutaneous bloat — and it normalizes over time. It does not add body fat.

Is creatine a steroid?

No. Creatine is a compound made from amino acids and found in food (meat, fish). It is not a hormone or anabolic steroid and does not raise testosterone.

Is creatine safe to take long-term?

Yes, for healthy adults. The longest controlled studies show no harm at up to 30 g/day for five years, and standard 3–5 g/day maintenance has an excellent long-term safety record.

Who should be cautious with creatine?

People with pre-existing kidney disease, and those who are pregnant or breastfeeding, should talk to a clinician first — not because harm is shown, but because these groups are understudied.

Sources

  1. Kreider RB, 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. PMID 28615996
  2. Antonio J, 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. PMID 33557850
  3. Branch JD. Effect of creatine supplementation on body composition and performance: a meta-analysis. Int J Sport Nutr Exerc Metab. 2003;13(2):198–226. PMID 12945830
  4. Lanhers C, et al. Creatine supplementation and lower limb strength performance: a systematic review and meta-analyses. Sports Med. 2015;45(9):1285–1294. PMID 25946994
  5. Lanhers C, et al. Creatine supplementation and upper limb strength performance: a systematic review and meta-analysis. Sports Med. 2017;47(1):163–173. PMID 27328852
  6. Chilibeck PD, et al. 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. PMID 29138605
  7. Cooper R, et al. Creatine supplementation with specific view to exercise/sports performance: an update. J Int Soc Sports Nutr. 2012;9(1):33. PMID 22817979
  8. Harris RC, Söderlund K, Hultman E. Elevation of creatine in resting and exercised muscle of normal subjects by creatine supplementation. Clin Sci (Lond). 1992;83(3):367–374. PMID 1327657
  9. 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. PMID 19741313
  10. Rae C, et al. Oral creatine monohydrate supplementation improves brain performance: a double-blind, placebo-controlled, cross-over trial. Proc Biol Sci. 2003;270(1529):2147–2150. PMID 14561278
  11. Avgerinos KI, et al. Effects of creatine supplementation on cognitive function of healthy individuals: a systematic review of randomized controlled trials. Exp Gerontol. 2018;108:166–173. PMID 29704637
  12. Roschel H, et al. Creatine supplementation and brain health. Nutrients. 2021;13(2):586. PMID 33578876
  13. de Souza e Silva A, et al. Effects of creatine supplementation on renal function: a systematic review and meta-analysis. J Renal Nutr. 2019;29(6):480–489. PMID 31375416
  14. Longobardi I, et al. Is it time for a requiem for creatine supplementation-induced kidney failure? A narrative review. Nutrients. 2023;15(6):1466. PMID 36986197
  15. Jagim AR, et al. A buffered form of creatine does not promote greater changes in muscle creatine content, body composition, or training adaptations than creatine monohydrate. J Int Soc Sports Nutr. 2012;9(1):43. PMID 22971354
  16. Spillane M, et al. The effects of creatine ethyl ester supplementation combined with heavy resistance training on body composition, muscle performance, and serum and muscle creatine levels. J Int Soc Sports Nutr. 2009;6:6. PMID 19228401
  17. Syrotuik DG, Bell GJ. Acute creatine monohydrate supplementation: a descriptive physiological profile of responders vs. nonresponders. J Strength Cond Res. 2004;18(3):610–617. PMID 15320650
  18. Gordji-Nejad A, et al. Single dose creatine improves cognitive performance and induces changes in cerebral high-energy phosphates during sleep deprivation. Sci Rep. 2024;14:4937. DOI 10.1038/s41598-024-54249-9
  19. Pashayee-Khamene F, et al. Effects of creatine supplementation protocols on body composition: a systematic review and meta-analysis (143 studies). J Int Soc Sports Nutr. 2024;21(1):2380058. PMID 39042054
  20. Forbes SC, et al. Meta-analysis examining the importance of creatine ingestion strategies on lean tissue mass and strength in older adults. Nutrients. 2021;13(6):1912. PMID 34199420
  21. Devries MC, Phillips SM. Creatine supplementation during resistance training in older adults: a meta-analysis. Med Sci Sports Exerc. 2014;46(6):1194–1203. PMID 24576864
  22. Northeast B, Clifford T. The effect of creatine supplementation on markers of exercise-induced muscle damage: a systematic review and meta-analysis. Int J Sport Nutr Exerc Metab. 2021;31(3):276–291. PMID 33631721
  23. Chilibeck PD, et al. Effects of creatine and resistance training on bone health in postmenopausal women. Med Sci Sports Exerc. 2015;47(8):1587–1595. PMID 25386713
  24. Chilibeck PD, et al. A 2-year randomized controlled trial on creatine supplementation during exercise and bone health in postmenopausal women. Med Sci Sports Exerc. 2023. PMID 37144634
  25. Gualano B, et al. Creatine in type 2 diabetes: a randomized, double-blind, placebo-controlled trial. Med Sci Sports Exerc. 2011;43(5):770–778. PMID 20881878
  26. Hespel P, et al. Oral creatine supplementation facilitates the rehabilitation of disuse atrophy. J Physiol. 2001;536(Pt 2):625–633. PMID 11600695
  27. Johnston APW, Burke DG, MacNeil LG, Candow DG. Effect of creatine supplementation during cast-induced immobilization on muscle mass, strength, and endurance. J Strength Cond Res. 2009;23(1):116–120. PMID 19130643