Lysine
"Works incredibly well as prevention with 1g per day for oral herpes, then during occasional (and I mean years between last and current) up to 4g, and it disappears inside of a week.

I managed to transfer my cold sore the genital area and IT doesn't work as well there, but still aids an outbreak that can often take weeks to disperse.

Get the bulk powder, instead of tablets. The cost is greatly reduced, and you need only mix it with a splash of juice to drink it."