Preservativemedium risk Common irritant
Quaternium-15
INCI · Quaternium-15
A formaldehyde-releasing preservative. Common cause of cosmetic allergy.
Why dermatologists flag it
Formaldehyde releaser - one of most potent formaldehyde donors
Names to look for on labels
Quaternium-15 appears under any of these names — manufacturers choose between INCI, common, and local-language terms freely.
Quaternium-15Dowicil 200Dowicil 75क्वाटरनियम-15
Common product categories
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