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Trout is an excellent source of vitamin D, with a 3-ounce serving providing 645 IU—more than 100% of the daily recommended intake for most adults. This makes it one of the richest natural ...
Foods such as the flesh of fatty fish are good natural sources of vitamin D; there are few other foods where it naturally appears in significant amounts. [2] In the U.S. and other countries, cow's milk and plant-based milk substitutes are fortified with vitamin D 3, as are many breakfast cereals.
Cholecalciferol, also known as vitamin D 3 or colecalciferol, is a type of vitamin D that is produced by the skin when exposed to UVB light; it is found in certain foods and can be taken as a dietary supplement. [3] Cholecalciferol is synthesised in the skin following sunlight exposure. [4]
There are not many foods that naturally have vitamin D. [33] Examples are cod liver oil and oily fish. If people cannot get sunlight, then they will need 1,000 IU of vitamin D per day to stay healthy. [34] A person would have to eat oily fish three or four times per week in order to get enough vitamin D from that food source alone.
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).
Cholecalciferol (vitamin D 3) is synthesized in the skin after exposure to the sun or consumed from food, usually from animal sources. [45] Ergocalciferol (vitamin D 2) is derived from ergosterol from UV-exposed mushrooms or yeast. [45] When produced industrially as supplements, vitamin D 3 is typically derived from lanolin in sheep wool.
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