Unique Ingredient Identifier

• Name: Unique Ingredient Identifier
• Alternative Name: UNII
• Specification URI: https://www.fda.gov/industry/fda-resources-data-standards/fdas-global-substance-registration-system
• Scope: Substance
• Disciplines: Other
• Keywords: chemicals, proteins, substances
• Description: The Unique Ingredient Identifier (UNII) is an alphanumeric identifier linked to a substance's molecular structure or descriptive information and is generated by the Global Substance Registration System (GSRS) of the Food and Drug Administration (FDA). It classifies substances as chemical, protein, nucleic acid, polymer, structurally diverse, or mixture according to ISO standards.