Malic Acid + Magnesium is ProHealth's original, effective formulation of malic acid and magnesium oxide. These ingredients work synergistically and are essential in promoting proper muscle function. Supplementing your diet with Malic Acid + Magnesium may also increase stamina and endurance as malic acid is necessary for the conversion of fats and sugars into ATP, your body's energy source. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.