International Protein Creatine Monohydrate - 250 g (0.55 lb)

Creatine is involved in making energy for muscles. About 95% of it is found in skeletal muscle. The majority of sports supplements in the US contain creatine. People who have lower creatine levels when they start taking creatine seem to get more benefits than people who start with higher levels.
People commonly use creatine to improve exercise performance and increase muscle mass. It is also used for muscle cramps, fatigue, multiple sclerosis (MS), depression, and many other conditions, but there is no good scientific evidence to support most of these uses.

Creatine use is allowed by the International Olympic Committee and the National Collegiate Athletic Association (NCAA).