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Preservative

QUATERNIUM-15

CAS 4080-31-3 / 51229-78-8
18

Safety score · 0–100

Avoid

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

Quaternium-15 — a formaldehyde-releasing preservative. Effective antimicrobial but consistently one of the top contact-allergen offenders in dermatology data; restricted in the EU.

Skin benefits

  • Broad-spectrum preservation

Known concerns

  • Releases formaldehyde
  • Top contact allergen
  • EU restricted
  • Avoid in leave-on products

References

EU

EU CosIng database

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

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Check your shelf

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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.