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Vitamin D toxicity, or hypervitaminosis D, is the toxic state of an excess of vitamin D. The normal range for blood concentration of 25-hydroxyvitamin D in adults is 20 to 50 nanograms per milliliter (ng/mL).
DRIs are established for elements, vitamins, and macronutrients. Common elemental [17] and vitamin [18] doses are measured in milligrams per day (mg/d) or micrograms per day (μg/d). Common macronutrient [19] doses are in grams per day (g/d). Recommended doses for all three are established by both gender and age.
The Institute of Medicine in 2010 recommended a maximum uptake of vitamin D of 4000 IU/d, finding that the dose for lowest observed adverse effect level is 40,000 IU daily for at least 12 weeks, [25] and that there was a single case of toxicity above 10 000 IU after more than seven years of daily intake; this case of toxicity occurred in ...
The recommended daily intake of vitamin D is 600 IU (international units) for most adults, increasing to 800 IU for those over 70. ... with a 3-ounce serving providing 645 IU—more than 100% of ...
Others who may need more vitamin D that the recommended amounts: People with conditions that limit fat absorption, such as Crohn’s disease , celiac disease or ulcerative colitis ;
Vitamin D 3 was shown to result from the ultraviolet irradiation of 7-dehydrocholesterol. Although a chemical nomenclature for vitamin D forms was recommended in 1981, [12] alternative names remain commonly used. [3] Chemically, the various forms of vitamin D are secosteroids, meaning that one of the bonds in the steroid rings is broken. [13]
Recommended Dietary Allowances (RDA), the daily dietary intake level of a nutrient considered sufficient by the Food and Nutrition Board of the Institute of Medicine to meet the requirements of 97.5% of healthy individuals in each life stage and sex group. The definition implies that the intake level would cause a harmful nutrient deficiency in ...
The unit conversions of substance concentrations from the molar to the mass concentration scale above are made as follows: ... (a vitamin D) – Standard reference ...
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