During explosive activities like sprinting or weightlifting, phosphocreatine rapidly donates phosphate groups to regenerate ATP, fueling muscular contractions and increasing power output (Buford et al., Journal of the International Society of Sports Nutrition )
Cleveland Clinic, Mayo Clinic, and NIH Office of Dietary Supplements are all consistent on this point
The remaining 10% were cited in the references found within this search, with the exception of some very recent papers
Hypertension 65(3):490498
If you are comparing formulas and want a broader guide, our article on Does Glutathione Help with Dark Spots
Also, inform your doctor about all medicines you are taking, including supplements and herbal products