GNC Potassium & Magnesium Aspartate: 240-Day Supply Helps regulate water balance.* Necessary for normal muscle cell contraction.* Potassium is involved in the regulation of cellular water balance.* Magnesium is involved in nerve, skeletal muscle, heart, and cell function.* Features 20mg of magnesium per serving Supplies 57mg of potassium per serving Gluten free These statements have not been evaluated by the Food & Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.