Amino acids are organic compounds that make up the “building blocks” of protein. They are necessary for the body to product hair, skin, blood and more. L-arginine is one of the most important amino acids and it plays a major role in supporting the immune system and promoting muscle growth. Each capsule of Vitabase L-Arginine contains 500 mg of L-arginine. We also include vitamin B-6 in our formula because it plays a major role in metabolizing amino acids.