USP – U.S. Pharmacopeia

USP’s mission is to improve global health through public standards and related programs that help ensure the quality, safety, and benefit of medicines and foods. Through a public, collaborative process with industry, users and regulators, USP produces documentary and reference standards for drug substances, excipients, biologics, compounded preparations, dietary supplements and food ingredients.  USP’s standards are legally recognized in the U.S. and elsewhere, and are used in more than 140 countries.

USP Home Page


Everything that goes into a medication serves an important purpose. Inactive ingredients are critical for a drug to be effective, making up to 90% of the medication. However, they can also cause great harm if their quality is poor. By creating standards for excipients, we play a key role in ensuring the purity of the whole drug. Our documentary standards set guidelines for quality in manufacturing, while our reference standards help manufacturers verify the quality of their excipient supply. At every step, we’re protecting the public’s health by helping to prevent poor-quality medication from entering the marketplace.

  • Reference Standards
  • Modernization & Priority New Monographs
  • Pending Monographs
  • General Chapters
  • Harmonized Standards
  • Nomenclature
  • Expert Committees
  • FAQs

USP Excipients Site

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