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Vitamin D is VERY important.
Careful now. Vitamin D is a fat soluble vitamin, meaning, you take this, it doesn’t just wash out via pee like vitamin C.
“excerpt follows”
Because the body has a built in mechanism for preventing toxicity with vitamin D produced in the skin, there is no risk of vitamin D toxicity due to ultraviolet-B (UVB) exposure - whether from the Sun or a tanning bed.
Supplemental vitamin D bypasses this built-in protection and, if excessive amounts are consumed over a period of time, 25(OH)D blood levels can reach a point where toxicity is possible
http://www.vitamindcouncil.org/about-vitamin-d/what-is-vitamin-d/vitamin-d-toxicity/