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USP

USP currently offers more than 3,500 Reference Standards—highly characterized specimens of drug substances, excipients, food ingredients, impurities, degradation products, dietary supplements, compendial reagents, and performance calibrators.

USP Reference Standards are specified for use in conducting official USP–NF tests and assays. USP also provides Reference Standards specified in the Food Chemicals Codex as well as authentic substances—high-quality chemical samples—as a service to analytical, clinical, pharmaceutical, and research laboratories.

For more information visit http://www.usp.org/reference-standards