From the Manufacturer:
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 building the immune system, promoting muscle growth and healing, increasing sperm counts, protecting the liver and more. 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.