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international unit

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Also known as IU

pharmacological measurement unit for the amount of a biologically active substance

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Multivitamins nutrition facts label showing that the international unit of, for example, vitamins D and E correspond to different gram values

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).

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