Formaldehyde-releasing preservative
N,N''-Methylenebis[N'-[3-(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl]urea]
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A formaldehyde-releasing preservative in the imidazolidinyl urea family. Effective against microbes in water-based products but a recognized contact allergen, with growing avoidance in sensitive-skin formulas.
Skin benefits
- Effective broad-spectrum preservative (imidazolidinyl urea family)
- Helps prevent microbial spoilage of water-based cosmetics
- Active across a wide pH range
Known concerns
- Formaldehyde-releasing preservative
- Established contact allergen, especially on facial skin
- Avoided by clean-beauty and sensitive-skin formulators
- Regulatory pressure in EU has led to declining acceptable concentrations
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.