@ZipLine-- I take Lysine supplements for cold sores, it works! It fights the virus by strengthening the immune system.
I start to take it as soon as I feel one coming on. It prevents the cold sore from forming and if it has already formed, it prevents it from maturing and ulcerating.
I highly recommend this supplement. You don't need to take it all the time. Just take it at first signs of a cold sore and keep taking it every day until it's completely gone.