An essential amino acid that our bodies do not produce, lysine must be supplied from food or supplements. Research has shown this powerful immune-supporting amino acid to be a safe and effective natural means of controlling certain viruses, including herpes (cold sores and genital) and canker sores. Put the power of lysine to work for you and say goodbye to painful and embarrassing cold sores and herpes outbreaks. In addition to this, controversial research conducted by Linus Pauling also pointed to lysine as a critical part of heart health and its role in reversing atherosclerosis (build-up of plaque in the arteries). Note: High levels of the amino acid arginine may lower lysine levels in the body.