This time I will be covering Vitamin D function, but this is a fat-soluble vitamin that works at the cellular level. This vitamin is produced from cholesterol in the skin when it is exposed to Ultraviolet B Rays (UVB) from the sun or tanning beds. The active form of the vitamin is not really a vitamin, but a steroid hormone, which flows freely into the nucleus of cells to modulate gene expression.
There are two main forms of dietary Vitamin D, those are D2 (ergocalciferol) and D3 (cholecalciferol). D2 is mainly produced by plants,
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