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If you choose to take vitamin D supplements, 10 micrograms a day will be enough for most people. "Do not take more than 100 ...

Vitamin D3 supplementation was associated with antihypertensive effects without significant between-dose differences among ...

If you choose to take vitamin D supplements, 10 micrograms a day will be enough for most people. "Do not take more than 100 micrograms (4,000 IU) of vitamin D a day as it could be harmful.

In the United States, current guidelines suggest that consuming 400–800 International Units (IU), or 10–20 micrograms (mcg), of vitamin D should meet the needs of 97%–98% of all healthy people.

A 21-year-old man or women exposed to summer UVB light generates 10,000 IU (the equivalent of 250 mcg, 25 multivitamin pills of vitamin D, or 100 glasses of milk) of vitamin D in 15 to 20 minutes.

Sometimes the amount of vitamin D is expressed as International Units (IU). 1 microgram of vitamin D is equal to 40 IU. So 10 micrograms of vitamin D is equal to 400 IU." ...