The International Unit (IU) is a standard unit of measurement used in pharmacology and biochemistry to quantify the biological effect or activity of a substance. It is commonly used for vitamins, hormones, some medications, vaccines, and other biological products. The IU provides a way to express the potency of these substances based on their effects rather than their mass or volume. The specific definition of an IU can vary depending on the substance being measured, as it is based on established biological effects.
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