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Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and for many other biological effects. [ 1][ 2] In humans, the most important compounds in this group are vitamin D 3 ( cholecalciferol) and vitamin D 2 ( ergocalciferol ). [ 2][ 3] The major natural source of ...
Vitamin D3 needs for the average adult between the ages 19 and 70 years old is 600 IU (15 mcg) per day, says Pelitera. “This includes foods, for example, 1 cup of fortified milk contains about ...
Vitamin D3, also known as cholecalciferol, is a form of vitamin D that is synthesized in the skin upon exposure to sunlight, says Hodson. "It can also be consumed through dietary sources like fish ...
Cholecalciferol is a form of vitamin D which is naturally synthesized in skin and functions as a pro-hormone, being converted to calcitriol. This is important for maintaining calcium levels and promoting bone health and development. [ 4] As a medication, cholecalciferol may be taken as a dietary supplement to prevent or to treat vitamin D ...
The epidermal strata of the skin. 7-Dehydrocholesterol ( 7-DHC) is a zoosterol that functions in the serum as a cholesterol precursor, and is photochemically converted to vitamin D 3 in the skin, therefore functioning as provitamin -D 3. The presence of this compound in human skin enables humans to manufacture vitamin D 3 ( cholecalciferol ).
The best vitamin D supplements. Both vitamin D2 and D3 are good, but “D3 has better bioavailablilty,” says Dr. Manson, meaning that it’s more easily used by your body.
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