'Looks like vitamin D has been d-listed by scientists yet again, with new recommended dietary allowance (RDA) guidelines halving vitamin D intake from 800 international units (IU) per day to a paltry 400 IU. This, following conclusions made by the Endocrine Society after using a “gold standard for measuring 25(OH)D.” These findings were presented at the ENDO 2017 conference last April.
Principal investigator J. Christopher Gallagher, M.D. said on ScienceDaily.com, “The RDA is easily achievable with a supplement of 400 IU in winter, when vitamin D levels are lowest in North America. This has important ramifications for public health recommendations. The amount of vitamin D needed, 400 IU daily, is less than the figure recommended by the Institute of Medicine.”
For the last few years, medical and health professionals followed the IOM recommendations of 800 IU of vitamin D every day. The recommendation was set after a double-blind dose-response clinical trial made in 2007. In the study, doctors found that 800 IU of vitamin D was enough to meet the daily requirements of 97.5 percent of the population. However, using a newer, more advanced type of technology, researchers say that half that amount will suffice. Liquid chromatography mass spectrometry was used to reanalyze the 2007 data for a more “precise dose-response curve.” It was from this reanalysis that the calculated RDA of 400 IU was made.'
Read more: It's Criminal: Doctors now pushing to slash recommended vitamin D intake in half, even as most of the population is critically deficient in this anti-cancer nutrient
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