Vitamin D

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Vitamin D is an essential vitamin, which you can get in minimal quantities from food. It is responsible for healthy bones and calcium regulation in the blood.

However, vitamin D from food is not enough to satisfy your full demand, and you need to “manufacture” some of it, which is possible with exposure to the sun. UV-B rays interact with cholesterol, damaging it and producing in effect vitamin D, which is also a pro-hormone.