"Quest L-Lysine may increase the absorption and retention of calcium, the major structural component of bone. A higher ratio of Lysine to another amino acid (Arginine) in the body impacts immune function. Collagen, the major protein in the skin, is rich in Lysine. It is in a free-form, simple for the body to assimilate - and is suitable for vegetarians and vegans. Take up to six tablets daily on an empty stomach."