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People tend to get more cold sores in summer, because the virus can be activated by heat and sunlight. So when you feel that telltale tingle: Get a vitamin D gel capsule, prick it open with a clean pin, and put a drop of the liquid on your cold sore. Dermatologist Joshua Zeichner is from Mount Sinai Hospital in New York City… and he says the anti-inflammatory properties in vitamin D can reduce the severity of cold sores, and help them heal faster. 

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