Creatine Safety and the Kidney Myth

Supplement Science Editorial Team·Evidence-Based Supplement Research

Published May 25, 2026

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

Creatine monohydrate is among the most studied sports supplements and is generally regarded as well tolerated in...

Key Takeaways

Creatine monohydrate is among the most studied supplements and is generally well tolerated in healthy people at standard doses.
The 'kidney damage' myth largely stems from creatine raising creatinine, a kidney test marker — a measurement artifact.
Studies generally haven't shown standard creatine doses harm healthy kidneys.
Tell your provider you take creatine so creatinine-based tests are interpreted correctly.
People with kidney problems or risk factors should check with a clinician before using it.

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A well-studied supplement

Creatine monohydrate has been studied extensively for strength and exercise performance, and in healthy people at standard doses (commonly 3–5 g/day) it is generally regarded as well tolerated [1]. Yet the belief that it 'wrecks your kidneys' is widespread. Where does it come from?

The kidney-test confusion

The myth largely traces to a lab-test quirk, not actual damage:

Creatine is metabolized to creatinine, which is also the marker used to estimate kidney function.
Taking creatine can raise blood creatinine modestly — which a clinician unaware of the supplement might misread as worsening kidney function.
This is a measurement artifact, not evidence the kidneys are being harmed.

In people with healthy kidneys, studies generally have not shown that standard creatine doses cause kidney damage [1]. The practical lesson: tell your provider you take creatine so creatinine-based tests are interpreted correctly.

Who should still be cautious

People with existing kidney problems or reduced kidney function should check with a clinician before using creatine, since their situation differs from healthy users (see [supplements and kidney health](/learn/supplements-and-kidney-health)).
People on medications that affect the kidneys should also get guidance.
Very high doses beyond standard amounts aren't necessary and aren't the basis of the safety evidence.

Other practical notes

Mild side effects can include water retention and occasional GI upset; staying hydrated helps [2].
Quality varies, so a [third-party-tested](/learn/supplement-certification-seals-compared) product is worth choosing, especially for [tested athletes](/learn/supplements-for-athletes-and-banned-substances).

Practical guidance

In healthy people, standard-dose creatine is generally well tolerated; the kidney 'damage' claim is largely a test-marker misunderstanding.
Tell your provider you take it so creatinine results are read correctly.
With kidney problems or risk factors, check first rather than assuming it's fine.

Related Supplements

Creatine

Frequently Asked Questions

Does creatine damage your kidneys?

In people with healthy kidneys, studies generally haven't shown that standard creatine doses cause kidney damage. The widespread belief largely comes from a lab-test quirk: creatine raises creatinine, a marker used to estimate kidney function, which can be misread as worsening function if your provider doesn't know you take it.

Why does creatine raise my creatinine level?

Creatine is metabolized into creatinine, so supplementing can modestly raise blood creatinine. Because creatinine is used to estimate kidney function, this can look like a kidney problem on a test even though it's a measurement effect, not damage. Telling your provider you take creatine avoids the misinterpretation.

Who should be cautious with creatine?

People with existing kidney problems or reduced kidney function, and those on medications that affect the kidneys, should check with a clinician before using creatine, since their situation differs from healthy users. Standard doses are what the safety evidence is based on, so megadoses aren't necessary.

Is creatine safe to take long-term?

In healthy people at standard doses, creatine monohydrate is generally regarded as well tolerated, with mild possible effects like water retention. Choosing a third-party-tested product is wise, especially for drug-tested athletes, and anyone with kidney concerns should get individual guidance.

References

U.S. National Library of Medicine, MedlinePlus (2025). Dietary Supplements. MedlinePlus (U.S. National Library of Medicine).
National Institutes of Health, Office of Dietary Supplements (2023). Dietary Supplements: What You Need to Know. NIH Office of Dietary Supplements.