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.
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Ingredient Snapshot

Overview
A preservative that fights microbes but can irritate some skin.
Category
Preservative
Type
Preservative

Ingredient Ratings

Overall Rating

Fair

Comedogenic Risk

None

Skin Benefits

Helps keep formulas fresher for longer by limiting microbial growth. Some individuals may experience sensitivity, so patch testing is advisable.

Uses In Skincare & Cosmetics

Used in water-based lotions, gels, toners, and shampoos as part of a preservative system.

Comedogenic Rating

This ingredient is not typically evaluated for comedogenicity, and no standardized rating is available.

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.

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.

Products with Diazolidinyl Urea

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