Is Quaternium-91 safe in cosmetics?
Quaternium-91 has a safety rating of "GOOD" in our database. EU status: permitted. US status: permitted.
GOOD
Cosmetic Ingredient
Quaternium-91
INCI: QUATERNIUM-91
Quaternium-91 (CAS No publicly assigned CAS found; COSING Ref No. 58942) is a cosmetic cosmetic ingredient functioning as Hair conditioning agent. EU Regulation 1223/2009 status: permitted. Industrial safety data is also available in the chemical safety database.
CAS Number
No publicly assigned CAS found; COSING Ref No. 58942
View industrial chemical safety profile →
Function
Hair conditioning agent
Editorial assessment
GOOD
Preliminary editorial note — not a computed safety verdict.
Regulatory Status
EU EU Status
permitted
US US Status
permitted
US Notes
Not restricted; used commercially (typically blended with cetrimonium methosulfate and cetearyl alcohol)
For full compliance data across multiple jurisdictions, use the Substance Compliance tool.
Safety Data
Margin of Safety, dermal absorption, and sensitization profile summaries for Quaternium-91.
Calculate MoS for your specific formulation with the MoS Calculator.
Editorial summary
Preliminary editorial summary for Quaternium-91 — not a computed safety verdict. See the sourced toxicological data above.
Frequently Asked Questions
Is Quaternium-91 allowed in the EU?
Quaternium-91 EU regulatory status: permitted. This is based on EU Regulation 1223/2009 and its amendments.
What does Quaternium-91 do in cosmetics?
Quaternium-91 functions as: Hair conditioning agent. It is classified as a cosmetic ingredient in our database. CAS number: No publicly assigned CAS found; COSING Ref No. 58942.
Compliance Tools
Check Quaternium-91 compliance across multiple jurisdictions:
Ingredient Decoder
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82 Allergen Checker
Check for EU declarable fragrance allergens
Substance Compliance
Check compliance across multiple jurisdictions
MoS Calculator
Calculate Margin of Safety using SCCS methodology
Heavy Metal Limits
Compare limits across jurisdictions
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