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2. Vitamin D5 - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D5

   1α-Hydroxyvitamin D 5 is a chemical derivative of vitamin D 5.The motive to study 1α-hydroxyvitamin D 5 as a potential pharmaceutical drug stemmed from the tendency of calcitriol, a natural metabolite produced in the kidney, to cause toxic hypercalcemia in patients when dosed at concentrations needed to interrupt prostate cancer cells' cycle and stimulate apoptosis.

3. 24,25-Dihydroxycholecalciferol - Wikipedia

   en.wikipedia.org/wiki/24,25-Dihydroxycholecalciferol

   24,25-dihydroxyvitamin D 3 is formed from 25-hydroxyvitamin D 3 by the action of CYP24A1 (25-hydroxyvitamin D3-24-hydroxylase). CYP24A1 appears to be "a multicatalytic enzyme catalyzing most, if not all, of the reactions in the C-24/C-23 pathway of 25-OH-D 3 metabolism." [5]

4. 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.

5. Experts Say This Is Real Difference Between Vitamin D and D3

   www.aol.com/experts-real-difference-between...

   Both vitamin D2 and vitamin D3 will help to increase vitamin D levels in the blood, says Pelitera. However, some studies have shown that supplementing vitamin D3 does a little bit better of a job ...

6. 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.

7. Calcifediol - Wikipedia

   en.wikipedia.org/wiki/Calcifediol

   Calcifediol, also known as calcidiol, 25-hydroxycholecalciferol, or 25-hydroxyvitamin D 3 (abbreviated 25(OH)D 3), [1] is a form of vitamin D produced in the liver by hydroxylation of vitamin D 3 (cholecalciferol) by the enzyme vitamin D 25-hydroxylase.

8. Vitamin D and neurology - Wikipedia

   en.wikipedia.org/wiki/Vitamin_D_and_neurology

   These two forms of vitamin D are metabolized in the liver and stored as 25-hydroxyvitamin D. [4] Before biological use, the storage form must be converted into an active form. One common active form is 1,25-dihydroxyvitamin D. [4] The term vitamin D in this article means cholecalciferol, ergocalciferol, 25-hydroxyvitamin D, and the active forms ...

9. Alfacalcidol - Wikipedia

   en.wikipedia.org/wiki/Alfacalcidol

   Alfacalcidol (or 1-hydroxycholecalciferol) is an analogue of vitamin D used for supplementation in humans and as a poultry feed additive.. Alfacalcidol has a weaker impact on calcium metabolism [3] and parathyroid hormone levels [4] than calcitriol; but significant effects on the immune system, including regulatory T cells. [5]