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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.
While some studies have found that vitamin D 3 raises 25(OH)D blood levels faster and remains active in the body longer, [44] [45] others contend that vitamin D 2 sources are equally bioavailable and effective for raising and sustaining 25(OH)D. [46] [47] If digestive disorders compromise absorption, then intramuscular injection of up to ...
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. Vitamin D 2, or ergocalciferol, is obtained from D 2 supplements or fortified food sources. [3]
A global representation of vitamin D status in healthy populations (2012) A global representation of vitamin D status in healthy populations: reply to comment by Saadi (2013) File:BlankMap-World6.svg. Own work: Author: The RedBurn
There's lots of confusion around the difference between vitamin D2 and vitamin D3, and which is best for whom. Doctors and experts explain.
Cladina arbuscula specimens grown under different natural conditions contain provitamin D 2 and vitamin D 2, ranges 89–146 and 0.22–0.55 μg/g dry matter respectively. They also contain vitamin D 3 (range 0.67 to 2.04 μg/g) although provitamin D 3 could not be detected. Vitamin D levels correlate positively with UV irradiation. [26] Plantae
A new draft recommendation from the U.S. Task Force says taking vitamin D supplements with or without calcium does not prevent falls or fractures in older adults. kali9/Getty Images
The second (25-hydroxy vitamin D2) is from certain vegetable foods or ergocalciferol supplements. [11] Clinical tests for 25(OH)D often measure the total level of both of these two compounds together, generally without differentiating. [12] This measurement is considered the best indicator of overall vitamin D status.