active ingredient

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Active Ingredient

Any component that provides pharmacological activity or other direct effect in the diagnosis, cure, mitigation, treatment, or prevention of disease, or affects the structure or any function of the body of man or animals.

ac·tive in·gre·di·ent

(ak'tiv in-grē'dē-ĕnt)
Any component of a pharmaceutical product that exerts pharmacologic activity.
Synonym(s): active pharmaceutical ingredient.

active ingredient

the chemically active part of a manufactured product such as a HERBICIDE, the remainder being inert.