Is Creatine Bad for Your Kidneys? What the Research Says

If you have heard one scary thing about creatine, it is probably about your kidneys. It is the most common worry, and for healthy people it is also one of the most overblown.

Where the myth comes from

Kidney function is often checked by measuring creatinine in your blood. Creatine naturally breaks down into creatinine, so supplementing can nudge that number up a little. A doctor who does not know you take creatine might see a higher reading and worry — but the kidneys themselves are working fine. The marker moved, not your health.

What the research shows

Studies running for months and even years, including in athletes taking high doses, have not found kidney harm in healthy people. The major sports-nutrition reviews all conclude the same thing: at normal doses, creatine is safe for healthy adults.

Who should be careful

If you already have kidney disease or reduced kidney function, that is a different situation — talk to your doctor before starting. And if you ever get a blood test, mention that you take creatine so the creatinine reading is interpreted correctly.

Bottom line: for healthy people, creatine does not damage your kidneys. Stick to a sensible dose — the calculator gives you one based on your body.