Creatine damages your kidneys — Myth: False for healthy individuals.
Does Creatine Damage Your Kidneys?
The most persistent creatine myth comes from a misread blood marker, not from any real kidney injury.
If you have ever been told to avoid creatine because it “wrecks your kidneys,” you are not alone. It is the single most repeated creatine myth, and it has a surprisingly simple explanation rooted in one misunderstood blood test. The short version: in healthy people taking normal doses, creatine has not been shown to harm kidney function.
Where the myth comes from
Creatine supplementation raises creatinine, a natural by-product your body makes when it uses creatine for energy. Doctors use creatinine as a quick proxy to estimate kidney function, so when a supplementing athlete gets blood work done, a higher creatinine reading can look alarming. But that elevated number simply reflects the extra creatine moving through your system — not damage to the kidneys themselves. It is a measurement artifact, not an injury.
What the research shows
Multiple long-term studies, including trials following healthy users for up to five years, have found no adverse effect on kidney function at standard doses. The International Society of Sports Nutrition (ISSN) position stand states plainly that creatine is safe for healthy individuals when used as directed. The one sensible caveat: if you have pre-existing kidney disease, talk to your physician before supplementing. For the general, healthy population, the kidney scare is not supported by the evidence.
Frequently Asked Questions
Why does creatine raise my creatinine levels?
Creatinine is the natural breakdown product of creatine. Taking more creatine means more creatinine passes through your blood, which nudges that lab value up without reflecting any change in kidney health.
Should I get my kidneys checked before taking creatine?
Healthy adults generally do not need special testing. If you have an existing kidney condition, diabetes, or take medications that affect the kidneys, check with your doctor first.
Is creatine safe to take every day long term?
Yes. For healthy adults, 3 to 5 grams daily is well established as safe in both short- and long-term studies, with no need to cycle off.
References
- Kreider, R. B. et al. (2017). ISSN position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine.. Journal of the International Society of Sports Nutrition.
- de Guingand, D. L. et al. (2020). Creatine supplementation safety: a systematic review of reported adverse effects.. Nutrients.
- Antonio, J. et al. (2021). Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show?. Journal of the International Society of Sports Nutrition.