UNII Codes Lookup
What are UNII Codes?
Find Unique Ingredient Identifier (UNII) codes quickly search for substances by preferred substance name, UNII codes, substance synonyms and mappings. A Unique Ingredient Identifier (UNII) is a 10-character alphanumeric code assigned by the FDA to uniquely identify substances in drugs, biologics, and medical devices. UNIIs are non-proprietary, unambiguous, and freely available. The first two characters indicate the source of the substance, while the remaining eight specify the unique substance itself. This tool helps you efficiently access standardized substance information used across regulatory and drug databases.
The UNII information was last updated: July 02, 2025.
