Vitamin D The New Vitamin Revolution

There is a vitamin revolution brewing, and it is important to the health of young and old alike as researchers respond to what has been called the “vitamin D deficiency epidemic.” More than a dozen scientists at leading universities both in the United States and abroad have minced no words about it: many of us need more vitamin D. (See “Cod liver oil, vitamin A toxicity, frequent respiratory infections, and the vitamin D deficiency epidemic.”)1 The issue of deficiency may be especially true of children, yet it is also applicable to adults. Quite surprisingly as far as vitamin D is concerned, the suggested intakes in recent decades have fallen rather wide of the mark. Not only are the recommendations of 400 IU/day as an adequate intake (100 percent of U.S. Daily Value) and 2,000 IU/day as an upper limit too low, but also recommendations may have been more realistic 70 years ago. As detailed below, in a tale of two vitamins, A and D, scientists initially bet on the wrong one.

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