What are the current Recommended Dietary Allowances (RDAs) for vitamin D?

Updated: Aug 08, 2019
  • Author: Manish Suneja, MD, FASN, FACP; Chief Editor: Vecihi Batuman, MD, FASN  more...
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Answer

Current Recommended Dietary Allowances (RDAs) for vitamin D are 600 IU of vitamin D per day for adults for individuals from 1 to 70 years of age and 800 IU per day for those over 70 years. [12] Studies have demonstrated that despite adequate intake, that vitamin D insufficiency can still occur and lead to an increased PTH and subsequent bone turnover. Studies have also shown that dietary intake of vitamin D varies greatly by race and age. In a review of National Health and Nutrition Examination Survey (NHANES) III data from 2001-2006, 32% of African-American women were at risk for vitamin D deficiency—defined as serum 25-hydroxyvitamin D (24[OH]D) levels < 30 nmol/L—as compared with only 3% of white women. [13]

An observational study in elderly adults found that 74% of those studied were deficient in vitamin D, defined as 25(OH)D concentrations < 32 ng/mL, despite intake of more than 400-600 IU/d, which was the recommended RDA at the time. [14] The authors of this study suggested that elderly individuals may require as much as 1000 IU per day.


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