500 mg of freeform LArginine per serving from Ajipure Amino Acid from Ajinomoto the World Leading Supplier of Amino Acids  Nitric Oxide Booster   50 Vegetable Capsules 50 Servings  SoyFree GlutenFree NonGMO Kosher Certified Vegan  Free of milk egg fish crustacean shellfish tree nuts peanuts wheat soybeans and sesame Also free of corn gluten barley rice sodium and sugar