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There are 1000 micrograms (mcg) to a milligram (mg).

Consumers most often see IU's on the labels of vitamin packages: in standard preparations the equivalent of 1 IU is 0.3 microgram (0.0003 mg) for vitamin A, 50

micrograms (0.05 mg) for vitamin C, 25 nanograms (0.000 025 mg) for vitamin D, and 2/3 milligram for (natural) vitamin E. Please note: for many substances there is no definite conversion between international units and mass units (such as milligrams). This is because preparations of those substances vary in activity, so that the effect per milligram of one preparation is different from that of another.

Most vitamins are based on the IU values, so why do you want to convert them when you do not buy them that way? To do some further research on your vitamin choices, visit the following web site:

IU stands for International Unit, which used to be the method of measurement for Vitamin A. It has since changed to ug (micrograms) of RAE, which stands for Retinol Activity Units. Converting from IU to ug of RAE varies depending on the form of Vitamin A you're talking about. For most supplements however, it averages that 1 IU = 0.15 ug of RAE.

Tom M

Fort Wayne, IN

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