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In medical practice, a blood test for 25-hydroxy-vitamin D, 25(OH)D, is used to determine an individual's vitamin D status. [11] The name 25(OH)D refers to any combination of calcifediol (25-hydroxy-cholecalciferol), derived from vitamin D 3, and ercalcidiol (25-hydroxy-ergocalciferol), [1] derived from vitamin D 2.
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]
Several forms of vitamin D exist, with the two major forms being vitamin D 2 or ergocalciferol, and vitamin D 3 or cholecalciferol. [1]The common-use term "vitamin D" refers to both D 2 and D 3, which were chemically characterized, respectively, in 1931 and 1935.
“The FDA does not approve dietary supplements or their product labeling before they are sold to the public,” Dr. Cara Welch, director of the FDA’s Office of Dietary Supplement Programs in ...
Vitamin D and calcium are essential for overall health, but don’t reduce the risk of falls or fractures in generally healthy older adults, according to a new draft recommendation from the US ...
Cholecalciferol is a form of vitamin D which is naturally synthesized in skin and functions as a pro-hormone, being converted to calcitriol.This is important for maintaining calcium levels and promoting bone health and development. [4]
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