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The Bountiful Company is an American dietary supplements company. It is owned by Kohlberg Kravis Roberts, which sold most of the company's brands to Pfizer in 2021. [2]It was originally known as Nature's Bounty, Inc. but changed its name to NBTY, Inc. in 1995.
24,25-Dihydroxycholecalciferol, also known as 24,25-dihydroxyvitamin D 3 and (24R)-hydroxycalcidiol (abbreviated as 24(R),25-(OH) 2 D 3), [1] is a compound which is closely related to 1,25-dihydroxyvitamin D 3, the active form of vitamin D 3.
This results in the opening of the vitamin precursor B-ring through a conrotatory pathway making previtamin D 3 (pre-cholecalciferol). [43] In a process which is independent of UV light, the pre-cholecalciferol then undergoes a [1,7] antarafacial sigmatropic rearrangement [44] and therein finally isomerizes to form vitamin D 3.
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]
Ergocalciferol, also known as vitamin D 2 and nonspecifically calciferol, is a type of vitamin D found in food. It is used as a dietary supplement [ 3 ] to prevent and treat vitamin D deficiency [ 4 ] due to poor absorption by the intestines or liver disease . [ 5 ]
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