Lysine is one of the 20 amino acids normally found in proteins. Lysine is necessary for growth, development, tissue maintenance and repair. With its 4-aminobutyl side-chain, it is classified as a basic amino acid, along with arginine and histidine. It is an essential amino acid, and the human nutritional requirement is 1–1.5 g daily. A deficiency in lysine can result in a deficiency in niacin (which is a B Vitamin). This can cause the disease pellagra. Lysine can also be used as a nutritional supplement to help against herpes. We welcome you to browse through our Lysine product line. You will also find Lysine updated shopping; it’s safe, secure and easy to use.