Time in the sun can give you more than a burn; it may lead to a dreaded summer cold by suppressing your immune system, says Leslie Baumann, MD, a dermatologist in Miami. To protect yourself, seek shade and wear SPF daily. Too late? Boost your intake of vitamin C -- nosh on citrus fruits, strawberries, and peppers -- and use creams that contain the nutrient. "Studies show that vitamin C helps your immune system work better, and it's a powerful antioxidant that will neutralize free radical damage," Dr. Baumann says.
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