International unit
Pharmacological measurement unit for the amount of a biologically active substance
International unit
In pharmacology, the international unit (IU) is a unit of measurement for the effect or biological activity of a substance, for the purpose of easier comparison across similar forms of substances. International units are used to quantify vitamins and biologics (hormones, some medications, vaccines, blood products and similar biologically active substances). International units as used in pharmacology are not part of the International System of Units (SI).
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