Sunlight Turns Skin Cholesterol Vitamin-D

The way the sun gives people vitamin D is by converting cholesterol in the skin to vitamin D. When ultraviolet B radiation from sunlight hits your skin, it transforms a cholesterol-based precursor into vitamin D3, which your liver converts into 25-hydroxyvitamin D, and your kidneys then convert into the active form that helps your body absorb calcium and maintain healthy bones.

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