L-Lysine is an essential amino acid that the body is unable to synthesize. It is an important amino acid found mostly in foods of animal origin and therefore usually low in individuals on vegan/vegetarian type diet. Lysine is essential for healthy collagen. Collagen is the underlying structural material of all soft tissue in the body. This makes lysine important for the production of healthy blood vessels, skin, cartilage, tendons, and other important structural components of the body. We also need lysine to make carnitine. Our L-Lysine is the highest quality free-form L-lysine available.