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CETEARALKONIUM BROMIDE

42

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

A C16-C18 alkyl dimethyl benzyl quaternary ammonium compound (essentially benzalkonium chloride with a specific chain length), subject to EU Annex III restrictions at specific concentrations.

Ceteardimonium bromide is a benzalkonium chloride analogue with predominantly C16-C18 alkyl chains. Benzalkonium chloride is listed in EU Annex III with specific restrictions (entry III/65 for BAK in leave-on products, III/54 for other quaternary ammonium compounds). Ceteardimonium bromide falls under these restrictions. Reported to cause skin and eye irritation, and is a recognized respiratory sensitizer. The bromide counterion is less common than chloride and adds to irritancy profile.

Skin benefits

  • Antimicrobial preservation at low concentrations
  • Static conditioning for hair substrates
  • Effective emulsifier for oil-in-water systems

Known concerns

  • Listed in EU Annex III — restricted use in leave-on cosmetic products
  • Known respiratory sensitizer and irritant
  • Eye damage risk at higher concentrations
  • Bacterial resistance possible with repeated low-level exposure

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.