cold sores
"I take Valtrex on a semi-regular basis to help my immune system. For example, I take one per day plus vitamin D and never get a cold sore. I did this for six months so I wouldn't have one at my daughters wedding! They always appear when I am stressed or in the sun. I still take them a few times a week and use an SPF sunscreen everyday which helps a lot. It can be expensive but I will pay anything if it works, forget the over counter stuff."