“Production of vitamin D in nature always appears to require the presence of some UV light; even vitamin D in foodstuffs is ultimately derived from organisms, from mushrooms to animals, which are not able to synthesize it except through the action of sunlight at some point in the synthetic chain. For example, fish contain vitamin D only because they ultimately exist on calories from ocean algae which synthesize vitamin D in shallow waters from the action of solar UV.”

— Online encyclopedia Wikipedia.com’s explanation of dietary sources of vitamin D. The distinction is one that anti-sun lobbyists try to ignore: That sunlight is the only true natural source of what is accurately called “The Sunshine Vitamin”

To read the Wikipedia.com entry on vitamin D click here.