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2. Vitamin D - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D

   Vitamin D 3 (cholecalciferol) is produced industrially by exposing 7-dehydrocholesterol to UVB and UVC light, followed by purification. The 7-dehydrocholesterol is sourced as an extraction from lanolin, a waxy skin secretion in sheep's wool. [190] Vitamin D 2 (ergocalciferol) is produced in a similar way using ergosterol from yeast as a ...

3. How to Get Enough Vitamin D in The Winter, According to ... - AOL

   www.aol.com/enough-vitamin-d-winter-according...

   For individuals 1 through 70: 15 mcg of vitamin D per day (600 IU) For individuals 71 and older: 20 mcg of vitamin D per day (800 IU) Manetti notes that IU is "Often the unit used on supplements ...

4. International unit - Wikipedia

   en.wikipedia.org/wiki/International_unit

   Multivitamins nutrition facts label showing that the international unit of, for example, vitamins D and E correspond to different gram values. In pharmacology, the international unit (IU) is a unit of measurement for the effect or biological activity of a substance, for the purpose of easier comparison across similar forms of substances.

5. Vitamin D deficiency - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D_deficiency

   Mapping of several bone diseases onto levels of vitamin D (calcidiol) in the blood [6] Normal bone vs. osteoporosis. Vitamin D deficiency is typically diagnosed by measuring the concentration of the 25-hydroxyvitamin D in the blood, which is the most accurate measure of stores of vitamin D in the body.

6. 6 Foods with More Vitamin D Than an Egg, According to a ... - AOL

   www.aol.com/6-foods-more-vitamin-d-194319425.html

   Trout is an excellent source of vitamin D, with a 3-ounce serving providing 645 IU—more than 100% of the daily recommended intake for most adults. This makes it one of the richest natural ...

7. Cholecalciferol - Wikipedia

   en.wikipedia.org/wiki/Cholecalciferol

   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 ...