L-Lysine small 500 mg 100ct by Metabolic MaintenanceL Lysine is an essential amino acid that must be obtained from food or supplementation. Vegetarians and athletes who participate in frequent vigorous exercise are at highest risk for a lysine deficiency. Lysine seems to help the body absorb and conserve calcium and it plays an important role in the formation of collagen, a substance important for bones and connective tissues including skin, tendons and cartilage. L Lysine may also be useful for