Preservativemedium risk Common irritant
Diazolidinyl Urea
INCI · Diazolidinyl Urea
Formaldehyde-releasing preservative. Can trigger contact dermatitis in formaldehyde-sensitive individuals.
Why dermatologists flag it
NEA/ACDS-listed formaldehyde releaser — sensitizer for eczema-prone skin
Names to look for on labels
Diazolidinyl Urea appears under any of these names — manufacturers choose between INCI, common, and local-language terms freely.
Diazolidinyl UreaGermall IIN-(1,3-bis(hydroxymethyl)-2,5-dioxoimidazolidin-4-yl)-N,N'-bis(hydroxymethyl)urea
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