Diazolidinyl Urea
Quaternium-15Diazolidinyl UreaDiazolidinyl urea
Preservative
Quaternium 15 is a type of preservative used in cosmetics and personal care products to prevent the growth of bacteria and mold. It works by slowly releasing formaldehyde, a chemical that kills germs.
Moderate Concern
Source: EWG Skin Deep
The concern with Quaternium 15 is that it can release formaldehyde, a known carcinogen, which may cause skin irritation and allergic reactions in some people.
Quaternium-15 in Skincare: Why This Preservative is a NO-GO 🚫 #ToxicBeauty | What is Quaternium-15?
Nontoxic Life
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Last updated: May 16, 2026