Dietary Supplement Free-Form Powder Supports Muscle Metabolism* L Arginine is a crystalline, free-form amino acid. It is an important factor in muscle metabolism and works to transport, store, and excrete nitrogen. It is also a precursor of guanidine-phosphate, phosphoarginine and creatine, which are high-energy compounds found in muscles.* Suitable for vegetarians and hypoallergenic: Contains no yeast, dairy, egg, gluten, corn, soy or wheat. Contains no sugar, starch, salt, preservatives, or artificial color, flavor or fragrance. *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.