GENERAL INFORMATION: L-Lysine is an essential amino acid, meaning that it is not naturally produced in your body and that you need external sources. Viva provides you with L-lysine supplementation, which not only maintains good overall health, but also helps to reduce the recurrence of herpes simplex virus (HSV) infection (e.g. cold sores) and assist in collagen formation. Essential amino acid for the maintenance of good health. Helps to reduce the recurrence of herpes simplex virus (HSV) infection (e.g. cold sores). Helps in collagen formation.