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Old 10-01-2010, 07:29 AM   #2 (permalink)
swarayu
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Join Date: Sep 2010
Posts: 1
Default IU to mg

In pharmacology, the International Unit is a unit of measurement for the amount of a substance, based on measured biological activity or effect. "International Unit" is abbreviated as IU. It is an old measurement of vitamin activity determined by biological methods as opposed to new measures that are determined by direct chemical analysis.

Many health foods and supplements still use i.u. ( IU ).

For Vitamin A, 1 i.u. = 0.3g retinol, 3.6g b-carotene, or 7.2g other vitamin A carotenoids
For Vitamin D, 1 i.u. = 0.025g cholecalciferol
For Vitamin E, 1 i.u. = 0.67g natural a-tocopherol (different conversion factors are used for different forms of vitamin E)
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