Supplements · Metabolic & Cardiometabolic
creatine is safe for healthy adults
In plain terms: Is creatine safe to take long-term?
Part of: 🧪 creatine
Yes — it has one of the strongest safety records of any supplement, with no harm to kidney, liver, or heart markers in healthy adults across trials lasting years. Claims that literally everyone should take it, including pregnant or clinical populations, go further than the evidence.
📅 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
Creatine monohydrate has one of the best safety records of any supplement — no adverse effects on kidney, liver, or cardiovascular markers in healthy adults across trials up to years long. (Candow extends this to 'literally everyone incl. clinical/pregnant populations'; that broader claim outruns the healthy-adult evidence and is flagged in his scorecard.)
The evidence (13)
| Source | Grade | Stance | Quality | Finding |
|---|---|---|---|---|
| Al-Humadi S et al 2026 · study_type: mechanism | observational | supports | low | Narrative review states most common side effect is weight gain and no adverse renal effects appear in healthy athletes; duration not specified, synthesizes prior literature rather than new data. |
| Jager 2011 · Amino Acids | observational | supports | low | Analysis: creatine monohydrate has an established safety/regulatory record; novel forms less studied. |
| Longobardi 2023 · Nutrients | observational | supports | low | Narrative review: creatine safe for kidney health in the general population. |
| Antonio 2021 · J Int Soc Sports Nutr | observational | supports | low | Review: extensive safety data support creatine use in healthy individuals. |
| de Camargo KMR et al 2026 · study_type: meta-analysis | meta-analysis | mixed | moderate | Meta-analysis of 8 RCTs (healthy individuals, athletes, and clinical populations) found no significant acute or chronic effect of creatine on CRP or IL-6, i.e. no pro-inflammatory adverse signal; duration varied by included trial, not speci |
| Poortmans 2000 · Sports Med | observational | supports | low | Review: adverse-effect concerns are largely unsupported; creatine well-tolerated in healthy adults. |
| Almeida 2020 · J Sports Med Phys Fitness | RCT | supports | moderate | Double-blind placebo-controlled RCT: creatine safe, no adverse health markers. |
| Kreider 2017 · J Int Soc Sports Nutr | observational | supports | low | ISSN position stand: creatine is safe and well-tolerated across healthy populations. |
| Gimenez FVM et al 2026 · study_type: meta-analysis | meta-analysis | supports | low | Meta-analysis of 8 RCTs in adults found no statistically or clinically significant effect of creatine supplementation on total cholesterol, LDL-C, HDL-C, or triglycerides (durations per included RCTs, not specified in abstract). |
| Naddafha S et al 2026 · study_type: meta-analysis | meta-analysis | supports | moderate | Meta-analysis of 7 RCTs (12-104 weeks, median 38 weeks) in postmenopausal women found adverse events mild and similar to placebo, with unchanged renal indices across trials. |
| Longobardi I et al 2025 · study_type: meta-analysis | observational | supports | low | Narrative safety review concludes no evidence linking creatine to cancer or renal impairment in healthy individuals, and no significant effects on hydration/cramping; GI distress reported at high doses in some individuals, described as gene |
| de Souza e Silva 2019 · J Renal Nutr | meta-analysis | supports | high | SR+meta-analysis: no renal safety signal in healthy adults. |
| Gonzalez DE et al 2026 · study_type: RCT | meta-analysis | supports | high | Study-level dose-response analysis pooling >12,800 participants across 684 RCTs found reported side effects infrequent and mild/nonspecific, with no consistent dose- or duration-dependent increase in GI, renal, liver, or musculoskeletal adv |
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.