USP establishes written (documentary) and physical (reference) standards for medicines, food ingredients, dietary supplement products, and ingredients. These standards are used by regulatory agencies and manufacturers to help to ensure that the products developed are of the appropriate identity, strength, quality, purity, and consistency

USP presently provides more than 4000 Reference Standards which are highly characterized specimens of drug substances, excipients, food ingredients, impurities, degradation products, dietary supplements, compendial reagents and performance calibrators. USP Reference Standards are also specified for use in conducting official USP–NF tests and assays.

USP’s reference standards for food ingredients can also be found in its Food Chemicals Codex as well as authentic substance & high-quality chemical samples which are of great help in analytical, clinical, pharmaceutical and research laboratories.