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It can help fight and prevent but it works well if you take with a couple other supplements I take a few different things I found work for me which is lysine (which is the best vitamin for cold sores overall) b-complex, multi-vitamin, zinc, grapefruit seed extract, and echinecha now you might think that is alot but all those supplements also help fight colds and prevent you from getting sick and boosts your immunity but if you were going to select just one vitamin to use I would go with lysine but that's up to you

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14y ago

What else can I help you with?