Formaldehyde-releasing preservative
Cis-1-(3-chloroallyl)-3,5,7- triaza-1-azoniaadamantane chloride (cis-CTAC)
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
Quaternium-15 (cis-CTAC) is a formaldehyde-releasing preservative used in some leave-on and rinse-off products. Dermatologists rank it among the most common contact allergens, and EU restrictions are very tight.
Skin benefits
- Broad-spectrum antimicrobial preservative
- Effective against bacteria and fungi
Known concerns
- Toxic if swallowed or in contact with skin
- Strong skin sensitizer / formaldehyde releaser
- Suspected reproductive toxicant
- Often top contact allergen in dermatology clinics
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
Related formaldehyde-releasing preservatives
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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.