Nutricost's Nitric Oxide Booster has 500mg of L-Arginine, 500mg of L-Arginine HCl, 500mg of Arginine AKG 2:1, 375mg of L-Citrulline, and 375mg of L-Citrulline Malate 2:1 in every serving. Each bottle contains 90 capsules and 30 servings. If taken according to recommended use, one bottle is a 1 month supply. These Nitric Oxide Booster capsules are non-GMO, gluten free, and tested by independent ISO accredited laboratories.