L-Arginine is a conditionally essential amino acid, meaning that under normal circumstances it can be synthesized by the human body to cover its needs. In case of poor nutrition or heavy physical exertion, the biosynthetic pathway cannot produce sufficient quantities of Arginine and some must be consumed from the diet or from supplements. Being the only precursor of Nitric Oxide (NO) and important precursor of Creatine, Arginine supplementation is a general practice among athletes, bodybuilders. Taking high dose capsules is the easiest way to cover the increased demand of Arginine. Directions Take 2-4 capsules 30 minutes prior to training. Additionally, you may take one more serving upon awakening. Allergen info Manufactured in a facility that processes milk, soy and egg proteins, gluten and peanuts! Sizes 90 capsules 90 servings, 140 capsules 140 servings