L-Lysine has been shown in studies to help in the treatment and recovery from the Herpes (cold sore) virus. Lysine is an amino acid most prevalent in meat based foods and supplementation may be especially important for vegetarians/vegans. Amino Acids are essential to health. Most form the small structural components of protein and are required for the synthesis of protein within the body. The primary function of most Amino Acids is to furnish the essential material for duplication of the genetic code, for cell division, and for the formation of muscles and connective tissue.