You need vitamin D to help regulate the way your body uses calcium and ensure your bones, muscles and teeth remain strong. For healthy adults in the UK, much of the vitamin D you get is obtained by the action of sunlight on your skin. The sun’s ultraviolet light makes a relatively inactive form of vitamin D (cholecalciferol/vitamin D3) in your skin. This is carried by your blood to organs in your body that convert this into an active form of vitamin D that your body can use.
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