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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.
A third important effect of PTH on the kidneys is stimulation of the conversion of 25-hydroxy vitamin D into 1,25-dihydroxy vitamin D (calcitriol). [221] This form of vitamin D is the active hormone which promotes calcium uptake from the intestine via the action of calbindin. [223] Calcitriol also reduces calcium loss to urine. [220]
A systematic review published in the Cochrane Library looked at children up to three years old in Turkey and China and found there was a beneficial association between vitamin D and rickets. In Turkey children getting vitamin D had only a 4% chance of developing rickets compared to children who received no medical intervention.
If human milk is unavailable, infants should be fed iron-fortified infant formula. In addition, infants, soon after they're born, should begin receiving supplemental vitamin D. At about 6 months, infants should be introduced to nutrient-dense, complementary (and perhaps allergenic) foods. Infants and toddlers should be encouraged to consume ...
22-Dihydroergocalciferol is a form of vitamin D, also known as vitamin D 4. [2] It has the systematic name (5Z,7E)-(3S)-9,10-seco-5,7,10(19)-ergostatrien-3-ol. [1] Vitamin D 4 is found in certain mushrooms, being produced from ergosta-5,7-dienol (22,23-dihydroergosterol) instead of ergosterol. [3]
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