1000 mg of freeform LArginine per serving and AjiPure Amino Acid from Ajinomoto  World Leading Supplier of Amino Acids  Nitric Oxide Synthesis   50 Caplets 50 Servings  NonGMO Vegan Kosher Certified GlutenFree SoyFree  Free of milk egg fish crustacean shellfish tree nuts peanuts wheat soybeans and sesame Also free of corn gluten barley rice and sugar