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Are You Deficient in Vitamin D?

While exposure to sunlight can help you meet your vitamin D needs — crucial for bone strength — many people wear sunscreen which interferes with the production of vitamin D in your skin, according to ABC News. Vitamin D is synthesized in skin when it's exposed to UVB rays from the sun, and too much sunscreen will do more than just work effectively to block the sunlight; it also will cause a lack of vitamin D synthesis in skin. Those who apply sunscreen generously and always...