How many IUs equals 1 mg?

Answer 1

There is no direct conversion. The IU has a different value for every vitamin measured in those units.

Answer 2

That would depend what material you have 1 IU of, it varies.

Answer 3

It depends on the specific vitamin or supplement. The conversion ratio varies for different nutrients. For example, for vitamin D, 1 IU is equal to 0.025 micrograms (mcg) or 0.000025 milligrams (mg).