| http://www.w3.org/ns/prov#value | - The vegan form of vitamin D, which is called ergocalciferol or vitamin D2, has been shown to be as effective in raising blood levels of this nutrient as animal-derived vitamin D3 when it???s taken at a usual daily dose. (The RDA is 600 IUs; some experts recommend 1,000.) At megadoses, however, vitamin D2 may need to be taken more often.
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