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 also owns the copyright on the pharmacopeia itself. The USP is published in a combined volume with the National Formulary (a formulary of medicines authorized for prescription by US federal agencies) as the USP-NF. The USP-NF is a combination of two official compendia, the United States Pharmacopeia (USP) and the National Formulary (NF). It contains standards for medicines, dosage forms, drug substances, excipients, biologics, compounded preparations, medical devices, dietary supplements, and other therapeutics. The USP-NF is a recognized authority in the United States and other countries. The USP's focus on quality standards for medicines, dietary supplements, and food ingredients helps to ensure the quality of these products and their ingredients.