Is Creatine Safe for Your Kidneys?
Last updated: August 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
In people with healthy kidneys, yes — this is one of the better-studied safety questions in supplements, and trials up to five years at doses to 30 g daily have found no kidney harm. The confusion comes from creatine raising blood creatinine, which is a marker used to estimate kidney function but is not damage.
Key takeaways
- No kidney harm found in healthy people across long-term trials.
- Creatine raises serum creatinine — a marker, not an injury.
- Tell your doctor you take it, or a routine blood test may be misread.
What the evidence actually shows
Long-term studies, including trials running up to five years at doses as high as 30 g daily, have not found adverse effects on kidney function in healthy individuals. The ISSN position stand reviewed this literature and reached the same conclusion. This is not a case of absent evidence — it is a question that has been asked repeatedly and answered.
Why the myth persists
Creatine is metabolised to creatinine, which is excreted by the kidneys. Blood creatinine is the standard marker used to estimate glomerular filtration rate. Taking creatine raises it, so a routine blood test can show what looks like reduced kidney function when nothing is wrong. Doctors who do not know you take creatine may reasonably investigate further. Tell them.
Who should still be careful
Anyone with existing kidney disease should discuss it with their doctor before starting — not because harm is established, but because the evidence base is in healthy people and kidney disease changes the calculation. The same applies if you are on medication that affects kidney function.
Key ingredients to understand
The ingredients most relevant to this question, with what the evidence actually supports:
- Creatine Monohydrate — Creatine monohydrate is the most researched sports supplement in existence, with hundreds of trials supporting increased strength and lean mass…
- Creatine — Creatine is one of the most studied and effective sports supplements, with solid evidence for strength and high-intensity performance. Newer…
- Whey Protein — Whey is a complete, rapidly absorbed protein high in leucine, and it has as strong an evidence base for muscle protein synthesis as anything in…
- Electrolytes — Electrolytes are the charged minerals that regulate fluid balance, nerve signalling and muscle contraction — principally sodium, potassium,…
Frequently asked questions
Should I get my kidneys checked?
Not because of creatine specifically. If you have a blood test, mention that you take it so creatinine is interpreted correctly.
Does cycling reduce any risk?
There is no evidence of a risk to reduce, and no benefit to cycling has been demonstrated.
What about cystatin C?
It is a kidney marker unaffected by creatine, so it is a useful alternative if there is genuine uncertainty about your kidney function.
Related on FactoWiki
- All health answers
- Ingredient evidence guides
- Creatine Monohydrate — ingredient guide
- Creatine — ingredient guide
- How we review
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