Why it matters: Creatinine is a waste product filtered by the kidneys, and elevated levels may indicate reduced kidney ...

Creatinine is a byproduct of creatine and can indicate kidney health through urine tests. Athletes use creatine to build muscle strength and enhance performance. Creatine supplements are safe for most ...

Creatinine is more than just a number on your blood test—it’s a key marker of how well your kidneys are working. While levels can vary with age, muscle mass, and lifestyle, consistently high readings ...