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.
📅 Last reviewed: 2026-07-14 ⓘ
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.)
The evidence (11)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Poortmans 2000 · Sports Med | observational | supports | low | Review: no evidence creatine damages kidneys in healthy individuals at recommended doses. |
| Al-Humadi S et al 2026 · study_type: mechanism | observational | supports | low | Narrative review for orthopedic surgeons states creatine's most common side effect is weight gain and there do not appear to be adverse effects on renal function in healthy athletes. |
| Zhou 2024 · Renal Fail | observational | supports | moderate | Mendelian-randomization study: no causal effect of creatine supplementation on impaired renal function. |
| Rubinchuk A et al 2026 · study_type: meta-analysis | observational | supports | low | Systematic review of 5 studies (RCTs and cohorts) in adolescents/youth athletes found creatine monohydrate generally well tolerated with no consistent short-term safety signals in renal function, liver enzymes, or cardiometabolic markers. |
| Longobardi I et al 2025 · study_type: meta-analysis | observational | supports | low | Narrative safety review states studies consistently show no adverse effects on renal function in healthy individuals, while flagging caution for pre-existing kidney disease and pregnancy where evidence is lacking. |
| 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. |
| Tsiaras A et al 2026 · study_type: meta-analysis | meta-analysis | supports | high | Meta-analysis of 19 RCTs + 1 crossover trial: creatine supplementation raised serum creatinine (MD +0.13 mg/dL) but showed no difference in urea or eGFR (MD -5.20 mL/min/1.73m2, CI crosses null, n=8) vs control, no duration effect. |
| Naeini 2025 · BMC Nephrol | meta-analysis | supports | moderate | 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. |
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Educational only, not medical advice. Grades and scores reflect published evidence weighted by study design and quality; see the methodology.