Dietary Supplement Essential Amino Acid 100% Pure - Free-Form Pharmaceutical Grade L-Arginine is a conditionally essential basic amino acid involved primarily in urea metabolism and excretion as well as DNA synthesis.* NOW® L-Arginine is Pharmaceutical Grade. This product is sold by weight not volume. Contains no: sugar, salt, starch, yeast, wheat, gluten, corn, soy, milk, egg, shellfish or preservatives. *This statement has not been evaluated by the FDA. This product is not intended to diagnose, treat, cure or prevent any disease.