Amino Acid Supplement Promotes Hearth & Immune Health* Promotes the Effects of Exercise* L-Arginine is one of 20 amino acids, the building blocks of protein and is popular with bodybuilders and fitness enthusiasts. L-Arginine can serve as an energy precursor and is one of the most important amino acids involved in heart and immune function.* Guaranteed Quality - Laboratory Tested No Artificial Color, Flavor or Sweetener, No Preservatives, No Sugar, No Starch, No Milk, No Lactose, No Soy, No Gluten, No Wheat, No Yeast, No Fish. Sodium Free. Nutrition Questions or Comments? Call NutraPhone® *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.