L-lysine is an essential amino acid, one of the building blocks used by the body to make proteins. The body cannot synthesise L-Lysine so it must be wholly supplied by the diet. L-lysine has a number of roles including normal growth, muscle turnover and synthesis of L-carnitine. L-lysine is also used for the management of infections caused by the herpes simplex virus type 1. Each capsule of Cytoplan’s new vegan L-Lysine provides 500mg of L-lysine (the form of L-Lysine that is naturally occurring in food).