Mason Natural L-Arginine 500 mg (Capsules)Mason Natural L Arginine 500 mg (Capsules) Mason Natural L Arginine 500 mg may support Blood Flow and Vascular Function. L arginine is considered to be generally safe. Our L Arginine 500 mg formula contains 500 mg of L Arginine HCI and 60 mg of Calcium. It is guaranteed no added sugar, starch, sodium, yeast, fish, tree nuts, peanuts, egg, soy, wheat, dairy, egg, or shellfish. No artificial fragrance or preservatives. Because L arginine acts as a