Creatine

Following protein, creatine is one of the top natural bodybuilding supplements for muscle building and endurance. Naturally found in raw meat, and mostly destroyed by cooking, creatine produces adenosine triphosphate (ATP) in the cells. ATP is cellular energy required not only for vigorous sports but also for day to day living. Therefore, creatine has also proven helpful for ailments that involve a serious lack of cellular energy, like chronic fatigue syndrome, and fibromyalgia[i]. [i] http://www.alive.com/articles/view/20286/creating_health_benefits_with_creatine