Creatine is a chemical that is normally found in the body, mostly in muscles. It is made by the body and can also be obtained from certain foods. Fish and meats are good sources of creatine.Creatine can also be made in the laboratory.reatine is a chemical that is normally found in the body, mostly in muscles. It is made by the body and can also be obtained from certain foods. Fish and meats are good sources of creatine. Creatine can also be made in the laboratory.