The benefits of l-lysine are varied. It may be useful for treating cold sores and genital herpes caused by the herpes simplex virus. Shingles, caused by the herpes zoster virus, can also be treated with l-lysine. By using l-lysine supplements, people can reduce the number of recurring outbreaks associated with these viruses.
It may also be useful to treat conditions that include angina, aging skin and injuries.