Preservative/antimicrobial
METHYLBENZETHONIUM CHLORIDE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
Methylbenzethonium chloride is a quaternary ammonium preservative and antiseptic. Effective but with notable eye and skin irritation potential, so its use is restricted.
Function
Skin benefits
- Quaternary ammonium antimicrobial and preservative
- Effective against bacteria and yeasts
- Used historically in topical antiseptics
Known concerns
- Cationic surfactant with eye and skin irritation potential
- Sensitization risk on broken or sensitive skin
- Restricted use levels in EU cosmetics (Annex V preservative class)
- Not recommended in leave-on products without strong justification
References
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, so always read the physical product label and consult a healthcare professional for personal concerns.