Detailed Product Description: L-Lysine is an essential amino acid vital in the building of critical body proteins. It is necessary for growth and development, tissue repair, and the production enzymes. People with repeated cold sores and viral infections such as herpes are well advised to include L-Lysine as part of their diet. The body utilises L-Lysine for fatty acid breakdown, which is required for energy production, concentration and a healthy cardiovascular system.