Creatine is one of the most-studied supplements in the world, yet "is creatine bad for you?" is still one of the top questions people ask about it. Here's what decades of research actually show — including the lab-test mix-up behind a lot of the kidney worry.
Written by Vita Globe Editorial Team | Reviewed against ISSN position stands, NIH guidance and peer-reviewed research
Is creatine bad for you?
For healthy adults, the research says no. The International Society of Sports Nutrition concludes that creatine monohydrate is safe at recommended doses, including in studies lasting up to five years[1]. A meta-analysis of controlled trials found creatine did not harm kidney function[3], and the ISSN found no evidence that it causes dehydration, cramping or liver damage in healthy people[2]. The most common side effect is mild stomach upset from large single doses.
Caveat: People with existing kidney disease, those taking medications that affect the kidneys, and anyone pregnant, nursing or under 18 should talk to a doctor first.
Sources: ISSN Position Stand 2017 · J Ren Nutr 2019 Meta-Analysis · Verified 2026-09-27
IN THIS ARTICLE
- Is creatine bad for your kidneys?
- Why creatine can change your lab results
- Is creatine bad for your liver?
- Does creatine cause dehydration or cramps?
- Is it safe to take creatine long-term?
- Real side effects to know about
- Who should avoid or be careful with creatine?
- Frequently asked questions
- Sources
Is creatine bad for your kidneys?
This is the biggest worry people have, and it's been studied directly. A 2019 systematic review and meta-analysis in the Journal of Renal Nutrition pooled controlled trials measuring kidney function and concluded that creatine supplementation did not cause kidney damage in the populations studied[3]. The ISSN's review reached the same conclusion for healthy people taking recommended doses[1][2].
Where the worry came from: a small number of case reports, often involving people with pre-existing kidney problems or who were taking other substances, plus a misunderstanding of a common lab test (next section).
Why creatine can change your lab results
Doctors often estimate kidney function using blood creatinine, a normal breakdown product of creatine. When you take creatine, blood creatinine can rise a little — not because your kidneys are struggling, but because there's more creatine being broken down[2]. That can make an eGFR calculation look lower than your kidney function actually is.
What to do: tell your doctor you take creatine before bloodwork. If there's a question, other tests (like cystatin C) can measure kidney function without being affected by creatine.
Is creatine bad for your liver?
The ISSN's review found no evidence that creatine at recommended doses causes liver damage in healthy people[2]. Studies that have tracked liver enzymes during creatine use haven't shown meaningful changes. As with any supplement, people with liver disease should check with their doctor.
Does creatine cause dehydration or cramps?
This one has been tested repeatedly, including in athletes training in the heat. The ISSN concluded that creatine does not increase the risk of dehydration, cramping or heat illness — and some studies found fewer cramps and injuries in athletes taking creatine[1][2]. Staying well hydrated is still smart for anyone who trains.
Is it safe to take creatine long-term?
Research has followed people taking creatine daily for months to years, including studies of up to five years, and the ISSN reports no clinically significant adverse effects in healthy people at recommended doses[1]. You don't need to "cycle" off creatine for safety reasons.
The honest summary
- Kidneys: no harm found in healthy people in controlled research[3].
- Lab tests: creatine can raise blood creatinine — tell your doctor so it isn't misread[2].
- Liver, dehydration, cramping: not supported by the evidence[2].
- Existing kidney disease is the main reason to get medical advice first.
Real side effects to know about
- Stomach upset or diarrhea — most often with large single doses (for example, 10 g at once). Staying at 3–5 g per dose usually prevents it[2].
- A small, early bump on the scale — water stored in muscle, not fat. See Does Creatine Make You Gain Weight?
- Product quality issues — the bigger real-world risk is buying a product that doesn't contain what it claims. Choose third-party-tested creatine monohydrate.
Who should avoid or be careful with creatine?
- People with kidney disease or reduced kidney function
- People taking medications that affect the kidneys (such as regular high-dose NSAIDs) — ask your doctor or pharmacist
- Pregnant or nursing women, since research in these groups is limited
- Anyone under 18, unless a pediatrician or sports medicine doctor recommends it
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Frequently asked questions
Is creatine a steroid?
No. Creatine is a natural compound your body makes and that's found in foods like meat and fish. It's not a hormone and doesn't act like one[2].
Is creatine safe to take every day?
For healthy adults, daily use at 3–5 g is the standard approach used in safety research[1].
Does creatine raise blood pressure?
Research hasn't shown creatine raises blood pressure in healthy people. If you have high blood pressure, check with your doctor before adding any new supplement.
Can creatine cause hair loss?
A 2025 randomized trial found no difference in hair loss or DHT between creatine and placebo. Read more in Does Creatine Cause Hair Loss?
What does the NIH say about creatine?
The NIH Office of Dietary Supplements notes creatine can improve performance in short bursts of high-intensity exercise and that it appears safe for healthy adults at recommended doses[4].
Sources
- 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
- 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
- de Souza e Silva A, Pertille A, Reis Barbosa CG, et al. Effects of creatine supplementation on renal function: a systematic review and meta-analysis. J Ren Nutr. 2019;29(6):480–489. doi:10.1053/j.jrn.2019.05.004
- National Institutes of Health, Office of Dietary Supplements. Dietary Supplements for Exercise and Athletic Performance — Fact Sheet for Health Professionals. ods.od.nih.gov
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, under 18, have a kidney condition, or are taking medication.
