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Where is our vitamin D coming from: Part 2

Posted on: April 5, 2013   by  John Cannell, MD


As we know from the previous blog, Professor Robert Heaney found that 1,600 IU of vitamin D/day input source is missing from modern man. What I mean by that, is somehow 25(OH)D levels of modern man reflect that humans are getting an extra 1600 IU of vitamin D that is not coming from sun exposure or the cholecalciferol in food. The question has arose, might there be 25(OH)D in meat that accounts for the equivalent of 1600 IU of vitamin D?

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1 Response to Where is our vitamin D coming from: Part 2

  1. [email protected]

    WHat about 254 nM UVc from fluorescent lights? In spite of having a thin glass envelope, how much escapes from the ends of the bulbs where there may be less phosphor? From the active region of the bulb?

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