Snapshot
- Overview
- A preservative that fights microbes but can irritate some skin.
- Category
- Preservative
- Type
- Preservative
Diazolidinyl Urea
Diazolidinyl urea is a synthetic preservative that releases small amounts of formaldehyde in water-based products. It controls microbes and maintains formula stability, though sensitization concerns limit its use for some people.
Like this ingredient?
Our take
Is Diazolidinyl Urea a Good Ingredient?
Fair: Preserves water‑based formulas effectively, but as a formaldehyde‑releasing preservative it carries a higher sensitization risk for some users. Those sensitive to formaldehyde donors may prefer alternatives.
What it does
Skin Benefits
Helps keep formulas fresher for longer by limiting microbial growth. Some individuals may experience sensitivity, so patch testing is advisable.
Where you'll find it
Uses in Skincare & Cosmetics
Used in water-based lotions, gels, toners, and shampoos as part of a preservative system.
Before you use it
Safety
May cause irritation or allergic contact dermatitis in susceptible individuals, particularly those sensitive to formaldehyde donors; patch testing is prudent. Avoid use on broken or freshly irritated skin.
Products with Diazolidinyl Urea
