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Fundamentally vitamin D is used in the body for healthy bone development but like most vitamins it plays a part in multiple biochemical processes that our bodies depend upon.

Vitamin D can help with skin conditions like psoriasis because it is known to have a regulatory effect on the peptide responsible for it called cathelicidin.

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12y ago
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9y ago
Yes.
When the skin is exposed to sun light for an extended period of time (at least a half hour) it will begin converting cholesterol to Vitamin D. This process will continue as long as it is exposed to sufficiently strong sun light.
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13y ago

The word "vitamin" is a contraction of "vital amine" (back when it was thought they were all amines; vitamin D happens to not be). The word "vital" was used in the sense of "if you don't have them, you will cease to be vital, i.e. you will die."

It turns out your body can make some of them... vitamin D is one of these; your body can make it using cholesterol as a starting material. However, it's necessary to get some exposure to sunlight in order to do so. If you work outside, this probably isn't a problem; if you don't like the big room with the bright light and the blue ceiling, it could be, and you need to get some from your diet or supplements.

Vitamin D is actually toxic in very large doses.

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Q: Why is vitamin D good for your skin?
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