Unique Ingredient Identifiers (UNII)
FDA’s GSRS generates Unique Ingredient Identifiers (UNIIs) used in electronic listing and other regulatory activities throughout product life cycles.
About UNII
Beginning in 2006, FDA created a Substance Registration System and unique ingredient identifiers because no other code system met the agency’s regulatory needs. UNIIs can be generated at any time in the regulatory life cycle for any substance, from an atom to an organism.
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General information
Learn more about Unique Ingredient Identifiers