Everyone I know who has tried this says it works. I have had it work for me too. Eating raisins! My neighbor had fever blisters all of her life. When I told her about this she tried it and said it is the only thing that has ever worked. Years later she told me that she occasionally eats raisins just to ward them off. She said that since I told her about it she has never had another one. And she had been plagued with the fever blisters all of her life. The very old woman who told me had her theory. She said that the raisins purified the blood. Well whatever. It sure has worked for everyone I know that had fever blisters.