Vitamin D
is a fat soluble vitamin, scarcely found in ordinary food. There are
two forms of vitamin D, Vitamin D2 (ergocalciferol) and vitamin D3
(cholecalciferol). The human body obtains vitamin D from 2 sources;
Source 1: By exposure to the ultraviolet B (UVB) of sunlight, the
skin transforms subcutaneous cholesterol called 7-dehydrocholesterol
into vitamin D3 (cholecalciferol). Source 2: From food; for instance,
this list of high vitamin D content as a percentage of daily value
(DV),9
Cod liver oil 1 tablespoon (340%DV), A piece of salmon
3 ounce (199% DV), Sun-dried mushroom 3 ounce (100% DV) and
One egg (vitamin D is in yolk) 6% DV, etc.