<Tr> <Th> Key people </Th> <Td> Ronald T. Piervincenzi, Chief Executive Officer </Td> </Tr> <Tr> <Th> Website </Th> <Td> www.usp.org </Td> </Tr> <P> The United States Pharmacopeia (USP) is a pharmacopeia (compendium of drug information) for the United States published annually by the United States Pharmacopeial Convention (usually also called the USP), a nonprofit organization that owns the trademark and copyright . The USP is published in a combined volume with the National Formulary (a formulary) as the USP - NF . If a drug ingredient or drug product has an applicable USP quality standard (in the form of a USP - NF monograph), it must conform in order to use the designation "USP" or "NF ." Drugs subject to USP standards include both human drugs (prescription, over-the - counter, or otherwise), as well as animal drugs . USP - NF standards also have a role in U.S. federal law; a drug or drug ingredient with a name recognized in USP - NF is deemed adulterated if it does not satisfy compendial standards for strength, quality or purity . USP also sets standards for dietary supplements, and food ingredients (as part of the Food Chemicals Codex). USP has no role in enforcing its standards; enforcement is the responsibility of Food and Drug Administration (FDA) and other government authorities in the U.S. and elsewhere . </P> <P> USP establishes written (documentary) and physical (reference) standards for medicines, food ingredients, dietary supplement products, and ingredients . These standards are used by regulatory agencies and manufacturers to help to ensure that these products are of the appropriate identity, as well as strength, quality, purity, and consistency . </P>

What is the difference between usp and nf
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