Lysine is an essential amino acid which is highly effectively suppresses the Herpes Simplex virus.
This virus is latent in our bodies. In moments of weakness as periods of stress and fatigue can this virus go again manifest in the form of mouth blisters or cold sores around the lips. Popularly it is called fever blisters. Lysine, which is not in vegetables and grains occurs, plays an essential role in the absorption of calcium.
A nutritional supplement with Lysine is also important to prevent a calcium deficiency in the vegetarians.