Creatinine is a natural waste product that builds up in your blood as your muscles work. Creatine helps your muscles ... Kidney Disease Normal levels range between 0.7 and 1.2 milligrams per ...

When paired with resistance training, creatine supplements may improve strength and physical function in older adults, ...

However, elevated levels don’t always mean kidney damage. Creatinine is a waste product that forms when your muscles use creatine for energy production. Your kidneys filter creatinine out of ...