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What is Vitamin D3? Also known as the "sunshine vitamin," vitamin D3 is a nutrient that plays an important role in many functions in the body, most notably bone density and immune system health. Vitamin D3 (cholecalciferol) is the active form of vitamin D. It is made in the body from direct sunlight exposure on the skin (it is not formed from sunlight through window glass, because the glass filters out the required UV wavelength).…

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