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Whats the difference between a milligram (mg), microgram (mcg), and an IU?

April 26, 2017difference IU mcg MG microgram milligram

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Whats the difference between a milligram (mg), microgram (mcg), and an IU?

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A9: As metric units of measurement to quantify mass, 1000 micrograms (mcg) equal 1 milligram (mg). An IU (International Unit) is a unit of measurement for vitamins and other specific biologically active substances. The precise definition of one IU differs from substance to substance and is established by international agreement for each substance. There is no equivalence among different substances; for instance, one IU of vitamin E does not contain the same number of milligrams as one IU of vitamin A. For example, vitamin E exists in a number of different forms having different biological activities. Rather than specifying the precise type and mass of vitamin E in a preparation, the Supplement Facts label specifies the number of International Units of vitamin E.