Creatine

Creatine in solution. Creatine is found in vertebrates where it facilitates recycling of adenosine triphosphate (ATP), the energy currency of the cell, primarily in muscle and brain tissue. Recycling is achieved by converting adenosine diphosphate (ADP) back to ATP via donation of phosphate groups.

Back in the 1970s, scientists discovered that taking creatinein supplement form might enhance physical performance. ...Creatine is thought to improve strength, increase lean muscle mass, and help the muscles recover more quickly during exercise.