Imidazolidinyl urea is a synthetic antimicrobial preservative used in cosmetics and personal care products to prevent bacterial and fungal growth. It functions as a formaldehyde-releasing agent, gradually liberating small amounts of formaldehyde to provide preservation.
| Reported effect | How often | Notes |
|---|---|---|
Allergic contact dermatitis | Uncommon | One of the more common cosmetic preservative allergens; can cause sensitization in predisposed individuals. |
Skin irritation (redness, itching) | Uncommon | May occur particularly in those with sensitive skin or compromised skin barrier. |
Formaldehyde-related sensitivity | Rare | Individuals allergic to formaldehyde may react due to its formaldehyde-releasing mechanism. |
Eye or mucous membrane irritation | Rare | Possible with leave-on or high-concentration products near sensitive areas. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.