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For example, the US Adequate Intake recommendations from 1997 were 200 IU/day for infants, children, adults to age 50 and women during pregnancy or lactation, 400 IU/day for ages 51–70 and 600 IU/day for 71 and older. [168] Conversion: 1 μg (microgram) = 40 IU (international unit). [56]
A survey of attitudes towards pregnancy over age 50 among Australians found that 54.6% believed it was acceptable for a post-menopausal woman to have her own eggs transferred and that 37.9% believed it was acceptable for a post-menopausal woman to receive donated ova or embryos. [182]
Doses greater than 40 000 IU (1000 μg) per day are generally required before high blood calcium occurs. [12] Normal doses, 800–2000 IU per day, are safe in pregnancy. [5] Cholecalciferol was first described in 1936. [13] It is on the World Health Organization's List of Essential Medicines. [14]
Most over-the-counter vitamin D supplements are between 1,000 and 5,000 IU, and some are as high as 10,000 IU, says Adamian. "There's so many different supplements, so it's very important to ...
Vitamin D3, aka cholecalciferol, is important for bone health and immune function. Experts discuss benefits, sources, risks and who needs a supplement. How to get the most out of vitamin D3
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.
The recommended dietary allowance is 15 μg/d (600 IU per day; 800 IU for those over 70 years). Overdose has been observed at 1,925 μg/d (77,000 IU per day). [citation needed] Acute overdose requires between 15,000 μg/d (600,000 IU per day) and 42,000 μg/d (1,680,000 IU per day) over a period of several days to months.
Vitamin D deficiency Usually asymptomatic, causes reduce bone density ( osteomalacia ), rickets, myopathy, and is associated with the development of schizophrenia . It is typically diagnosed by measuring the concentration of the 25-hydroxyvitamin D (25(OH)D) in plasma, which is the most accurate measure of stores of vitamin D in the body.