It varies from one substance from another.
The international unit is based on the activity or effect of biologically active substances. Here are some examples.
For other substances, you may have to consult a pharmacist.
The recommended dietary allowance (RDA) of Vitamin D is 600 IU. What mass of Vitamin D does this represent?
Mass of Vitamin D = 600 IU × ##(0.025″µg”)/(1″IU”)## = 15 µg
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