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Vitamin D 2 supplements. In the United States and Canada as of 2016, the amount of vitamin D recommended is 400 IU per day for children, 600 IU/d for adults up to age 70, and 800 IU/d for people over age 70.
For vitamin D2, Pelitera says that there are only specific vitamin D2 dosage recommendations indicated for very specific diseases, including hypoparathyroidism, refractory rickets (also known as ...
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). [210] This form of vitamin D is the active hormone which promotes calcium uptake from the intestine via the action of calbindin. [212] Calcitriol also reduces calcium loss to urine. [209]
The Institute of Medicine in 2010 recommended a maximum uptake of vitamin D of 4000 IU/d, finding that the dose for lowest observed adverse effect level is 40,000 IU daily for at least 12 weeks, [25] and that there was a single case of toxicity above 10 000 IU after more than seven years of daily intake; this case of toxicity occurred in ...
Proponents of the vitamin D hypothesis have recommended dietary supplements (5,000 International Units (IU)/day for adults and 1,000 IU/day for every 25 pounds of body weight in children) and suggested that larger doses (2,000 IU/kg/day for 3–4 days) could be used to treat influenza.
An estimated third of Americans 60 and older take the supplements and more than 10 million blood tests for vitamin D levels are performed annually -- despite years of controversy over whether the ...
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