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2. Looking For A Vitamin D Supp? Choose One With D3, Not D2 - AOL

   www.aol.com/looking-vitamin-d-supp-choose...

   “These taste great, offer 2,000 IU of D3, and come with an awesome fruit and veggie blend for an extra immune boost,” Bogden says. ... "Combining Vitamin D and K can help with immune and ...

3. 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 ...

4. Vitamin D deficiency - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D_deficiency

   In that study, the compliance calculation could be questionable since only random samples of the returned medications were counted. In a study by De Niet et al., [72] 60 subjects with vitamin D deficiency were randomized to receive 2000 IU vitamin D3 daily or 50 000 IU monthly. They reported a similar efficacy of the two dosing frequencies ...

5. Vitamin D - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D

   For example, CYP11A1, an enzyme chiefly known for its role in steroidogenesis, has been found to hydroxylate vitamin D3 at several positions, including C-20, C-22, and C-23, without cleaving the side chain. The resulting metabolites, such as 20-hydroxyvitamin D3 and 20,23-dihydroxyvitamin D3, act as inverse agonists for RORα and RORγ2.

6. Calcifediol - Wikipedia

   en.wikipedia.org/wiki/Calcifediol

   At a typical intake of cholecalciferol (up to 2000 IU/day), conversion to calcifediol is rapid. When large doses are given (100,000 IU), it takes 7 days to reach peak calcifediol concentrations. [9] Calcifediol binds in the blood to vitamin D-binding protein (also known as gc-globulin) and is the main circulating vitamin D metabolite.

7. Vitamin D and neurology - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D_and_neurology

   Vitamin D (the inactive version) is mainly from two forms: vitamin D 3 and vitamin D 2.Vitamin D 3, or cholecalciferol, is formed in the skin after exposure to sunlight or ultra violet radiation or from D 3 supplements or fortified food sources.