Supplements · Metabolic & Cardiometabolic
creatine does not harm kidney function
In plain terms: Does creatine damage your kidneys?
Part of: 🧪 creatine
No — not in healthy people at normal doses. Creatine nudges up a blood marker (creatinine) that can look like kidney trouble on a test, but meta-analyses and even genetic studies find no actual harm. Existing kidney disease is a separate conversation with your doctor.
Evidence ladder
How far up the ladder this claim has climbed. A high consensus on a low rung means "consistent so far," not "proven in people."
Top evidence so far: All trials, pooled (Meta-analysis)
How the studies fall
What the evidence shows
The kidney-damage fear rests on a lab artifact: creatine raises serum **creatinine** (a harmless breakdown product), which inflates estimated GFR without any real loss of kidney function. Meta-analyses, an RCT, and a Mendelian-randomization study find no renal harm in healthy people at recommended doses. (Established kidney disease is a separate question, not tested here.) scope::healthy-adults
The evidence (7)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Poortmans 2000 · Sports Med | observational | supports | low | Review: no evidence creatine damages kidneys in healthy individuals at recommended doses. |
| Zhou 2024 · Renal Fail | observational | supports | moderate | Mendelian-randomization study: no causal effect of creatine supplementation on impaired renal function. |
| Vega 2019 · Rev Med Chil | observational | supports | low | Review: creatine transiently raises serum creatinine, mimicking — but not causing — kidney disease. |
| Almeida 2020 · J Sports Med Phys Fitness | RCT | supports | moderate | Double-blind RCT: creatine improved performance with no adverse change in renal markers. |
| Naeini 2025 · BMC Nephrol | meta-analysis | supports | high | SR+meta-analysis (2025): creatine did not impair kidney function; the creatinine rise is non-pathological. |
| Longobardi 2023 · Nutrients | observational | supports | low | Narrative review: no credible evidence of creatine-induced kidney failure; concern is the creatinine artifact. |
| de Souza e Silva 2019 · J Renal Nutr | meta-analysis | supports | high | SR+meta-analysis: creatine had no adverse effect on renal-function markers in healthy subjects. |
Disagree, or know a study we missed?
We grade by evidence, not opinions. The way to weigh in is to point us to a study we haven't cited (check the evidence table above first), or to flag a problem with one we have. Every submission is reviewed; if it holds up, the grade updates and shows in Science Changes Its Mind.
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.