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<<< "Basically D-3 always is derived from an animal. The sunlight reaction that converts 7-dehydrocholesterol to vitamin D-3 is a 'pure' chemical reaction that occurs in your skin in certain cells." Marian Herbert of the Vitamin D Workshop, a division of the biochemistry department at the University of California, wrote: "The provitamin known as 7-dehydrocholesterol is extracted and isolated from the skins of mammals and purified." I have subsequently learned that Vitamin D-3 can come from four different sources: Pig skin, sheep skin, raw fish liver, and pig brains.

Most of the time, Vitamin D-3 is extracted from pig skin and sold to dairy processors. >>>

Source: http://www.all-creatures.org/aip/nl-29nov2000.html -----or "The milk is passed under a series of ultraviolet lights to fortify it with Vitamin D." source: http://www.madehow.com/Volume-6/Evaporated-and-Condensed-Milk.html

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Q: How do they put vitamin D in milk?
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