Does Creatine Raise Creatinine Levels?
Last updated: August 2026 · Reviewed by the FactoWiki Editorial Team for clarity and source accuracy
Yes, and this is expected rather than concerning. Creatine breaks down into creatinine, so supplementing raises the blood level. It reflects more creatine in your system, not kidney damage — but it can cause a routine blood test to be misread if your doctor does not know.
Key takeaways
- Raised creatinine on creatine is a measurement artefact, not injury.
- Always tell your doctor you take it before a kidney panel.
- Cystatin C is an alternative marker that creatine does not affect.
The chemistry
Creatine and phosphocreatine break down at a roughly constant rate into creatinine, which the kidneys filter and excrete. More creatine in muscle means more creatinine produced daily. Blood creatinine goes up because production went up, not because clearance went down — and clearance is what kidney function actually means.
Why it matters practically
eGFR, the number used to screen for kidney disease, is calculated from serum creatinine. A creatine user can show a mildly reduced eGFR and be entirely healthy. That has led to unnecessary investigation and, occasionally, to people being told to stop things they did not need to stop. A single sentence to your doctor prevents all of it.
How to resolve genuine uncertainty
If there is real doubt about kidney function, cystatin C is a marker produced independently of muscle mass and creatine intake. A cystatin C-based eGFR gives a cleaner answer in someone who supplements. Stopping creatine for a few weeks before retesting also works.
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
How much does it rise?
Typically a modest rise, often still within or just above the reference range. It is not a dramatic change.
Should I stop before a blood test?
You can, but telling your doctor is simpler and preserves the picture. If you do stop, a few weeks is enough.
Does this mean creatine strains the kidneys?
No. Producing more creatinine is not the same as impairing the filtering that removes it.
Related on FactoWiki
- All health answers
- Ingredient evidence guides
- Creatine Monohydrate — ingredient guide
- Creatine — ingredient guide
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