L-Lysine by Twinlab is an amino acid that cannot be produced by the body from other nutrients. It helps ensure adequate absorption of calcium and the formation of collagen for bone- cartilage- and connective tissue.Twinlab L-Lysine strengthens circulation and helps the immune system manufacture antibodies. Lysine also helps control the body's acid/alkaline balance- influences the pineal and mammary glands and plays a role in gall bladder function. It is necessary for all amino acid assimilation and assists in the storage of fats.