L-Lysine is an essential amino acid that is a necessary building block for all proteins. It is needed for proper growth and bone development in children. L-Lysine helps in the collagen formation and tissue repair- and is therefore good for those recovering from surgery and sports injuries as it helps to repair muscle protein. It has also been proven to lowers high serum triglyceride levels. L-Lysine is most commonly used for the treatment and prevention of colds sores and mouth ulcers. L-Lysine inhibits normal replication of Herpes simplex virus (HSV)- shortening the normal course and duration of the disease. L-Lysine cannot be manufactured in the body. It is therefore vital that adequate amounts be included in the diet. Sona L-Lysine 500mg is made of the highest quality- providing 500mg of L-Lysine per tablet.