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The conversion from milligrams (mg) to international units (IU) varies depending on the substance being measured, as IU is a unit of biological activity rather than mass. Without knowing the specific substance, it is impossible to accurately convert 400 mg to IU. To determine the conversion factor, one would need to know the specific substance and its corresponding conversion rate from mg to IU as defined by the relevant regulatory body or scientific literature.

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Q: How many iu is 400 mg?
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400 IU of vitamin D is equivalent to 10 micrograms (mcg) or 0.01 milligrams (mg).


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