Creatine is a substance also manufactured by your liver, kidneys, and pancreas and it also occurs in natural foods like meat and fish. A lot of athletes take creatine supplements in order to increase strength and muscle volume. It's especially popular among strength and explosive power sports such as weightlifting, bodybuilding, sprinting etc. At the same time creatine hasn't been found to increase endurance or improve aerobic performance at all. Studies have shown that one third of of people don't react to creatine at all. Find more sports nutrition related topics at nutrition main.