Blueberry Naturals L-Lysine Tablet contains L-lysine, an amino acid that is necessary for many bodily functions. L-Lysine is an essential amino acid. It supports collagen production and research suggests that it supports the health of tissue in skin and lips, and help limit cold sores. Lysine is an essential amino acid, it's the building block for making proteins in the body. Lysine appears to help the body absorb calcium, it plays an important role in the formation of collagen, and it's important for bones and connective tissues including skin, tendons, and cartilage. Scientifically formulated with ingredients of the highest quality and produced in a certified cGMP (current Good Manufacturing Practices) manufacturing facility, Blueberry Naturals holds your health, quality and safety in the highest regard.