Diazolidinyl urea is a formaldehyde-releasing preservative used to prevent microbial growth in cosmetics and personal care products. It is effective against bacteria and some fungi and is commonly found in creams, lotions, and shampoos.
| Reported effect | How often | Notes |
|---|---|---|
Allergic contact dermatitis | Uncommon | Can sensitize individuals, particularly those allergic to formaldehyde; manifests as redness, itching, and rash. |
Skin irritation | Uncommon | Mild irritation may occur in sensitive individuals, especially at higher concentrations. |
Formaldehyde release sensitivity | Uncommon | Releases small amounts of formaldehyde over time, which is the primary trigger for sensitization in susceptible people. |
Cross-reactivity with other formaldehyde releasers | Rare | Individuals sensitized to one formaldehyde-releasing preservative may react to diazolidinyl urea. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.