United States Pharmacopeia (USP) – NF (National Formulary) includes over 5000 quality standards for medicines, both biological and chemical, active pharmaceutical ingredients, and excipients (inactive ingredients), and is considered the widest source in the world for medicine quality standards. USP-NF is the combination of two compendia the United States Pharmacopeia (USP) and National Formulary (NF) includes monographs for the dosage forms, drug substance, and compounded preparations as featured in USP.