The next home remedy on our list is a natural supplement found in vitamin and health food stores: lysine, or L-lysine.
Lysine is an essential amino acid, meaning it's needed for life but not naturally produced by the body [source: UMMC]. Most humans consume lysine through meat or legumes, but over-the-counter supplements are also widely available to increase that amount.
Though studies differ on its efficacy, lysine is thought to better prevent an outbreak than cure one. Regardless, it's a home remedy that many people who suffer from herpes simplex virus Type I or Type II use [source: UMMC].
Note: Before taking lysine or any other dietary supplement, consult your physician [source: ASHA]. Lysine has been known to interact with some medications, and it's generally not recommended in higher doses for people with kidney or liver disease.