Creatine is a natural substance that turns into creatine phosphate in the body. Creatine phosphate helps make a substance called adenosine triphosphate (ATP). ATP provides the energy for muscle contractions.
The body produces some of the creatine it uses. It also comes from protein-rich foods such as meat or fish.
It is used in neurodegenerative diseases, such as amyotrophic lateral sclerosis and Huntington and Parkinson diseases