Cold sores thrive on the amino acid arginine, found in chocolate and nuts, so you want to avoid these foods. Your body combats arginine with the amino acid lysine, which is concentrated in iron-rich foods such as red meat, poultry, fish, dairy, beans, and believe it or not, certain cereals. You can also take lysine supplements (1,000 milligrams three times a day) when you suspect an outbreak. Also try:

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