Like CorsairMac, I was wondering if L-Lysiene would help. I get cold sores and feel tingling when one is coming on. I have found taking a Lysiene compund from Quantum Foods helps immensely. The sooner I take it the better, like at the first tingle. I take a large initial dose, then a maintanance dose for several days. I don't ususally avoid the sore altogether, but definitely shorten the lifespan and size. This product has several herbs together with the lysiene. I have not had the same success with lysiene alone.

I've also identified several triggers (wind, sun, aerobic exertion and coffee are among them), and find that a combination of three generally guarantees an outbreak, while being exposed to one or two doesn't cause a problem.