Lysine is one of numerous amino acids that the body needs for growth and tissue repair. It is classified as one of the nine "essential" amino acids because you need to get it from outside sources such as foods or supplements--in other words the body can't make it on its own. Many foods supply lysine, but the richest sources by far include red meats, fish, dairy products, and Herbs & Supplementary Products. Lysine supplementation and the consumption of lysine-rich foods for lowering cholesterol, improving athletic performance, and enhancing recovery after surgery. Lysine may help to: Prevent and relieve cold sores (herpes), and Speed healing of shingles lesions. ( website removed by moderator )