USP Reference Standards Listings & Catalog

Find your Reference Standard

  • A to Z Index
    This convenient online index allows you to search through an alphabetical listing of USP’s Reference Standard collection and purchase items directly from the USP online store.
  • Daily Listings
    This website-only resource, which is updated daily, lists all USP Reference Standards with current lots, previous lots with valid use dates, and prices.
  • USP Catalog
    The USP Catalog is published online every two months (, and a print version will be available one time per year: beginning January 2015 (request print catalog). The USP Catalog lists USP Reference Standards with current lots, previous lots and valid use dates, purity values, CAS numbers, and prices. It also includes ordering information in multiple languages, information about USP publications and education courses, and details on how to use Reference Standards.

Use this helpful guide to interpret codes and information found in the listings.

Resources, Tools, Submit Feedback

Use the following tools to stay informed of USP Reference Standards currently under development, items that are newly released, and how you can suggest new items.