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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.
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]
How much vitamin D do you need per day? The recommended daily intake of vitamin D for healthy people varies by age, per the NIH . Children (1–18 years): 15 mcg or 600 IU
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.
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
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.
megaloblastic anemia and deficiency during pregnancy is associated with birth defects (e.g., neural-tube defects) may mask symptoms of vitamin B 12 deficiency; other effects. leafy vegetables, pasta, bread, cereal, liver B 12: cyanocobalamin, hydroxocobalamin, methylcobalamin, adenosylcobalamin: water 2.4 μg/2.4 μg vitamin B 12 deficiency ...
So supplements do make good sense for most adults. "Vitamin D is beneficial during the winter," says Sharp, "with 1,000 to 2,000 IU daily being safe for most people."