Preservative
Diazolidinyl Urea
A formaldehyde-releasing preservative used to protect cosmetic formulas, with some consumer concern over long-term formaldehyde exposure.
preservativeantimicrobialformaldehyde-releaser
⚠ Use with Caution
Comedogenic Rating
0/5
Irritation Potential
1/5
What is it?
Diazolidinyl Urea is a preservative belonging to the formaldehyde-releaser category — it works by slowly releasing trace formaldehyde, which provides the antimicrobial activity.
Used in cleansers and some leave-on products to protect against microbial growth, often paired with other preservatives.
Key Benefits
Effective antimicrobial protection
Reliably prevents bacterial and fungal contamination via slow formaldehyde release.
Suitable for
Main Actions
When it may be insufficient
As a formaldehyde-releaser, it raises concern for those with formaldehyde sensitivities, and many "clean beauty" formulas now avoid this preservative class.
CategoryPreservatives
Frequently Asked Questions
What does Diazolidinyl Urea do for skin?
Used in cleansers and some leave-on products to protect against microbial growth, often paired with other preservatives.
Who should use Diazolidinyl Urea?
Diazolidinyl Urea is suitable for: most skin types; those with known formaldehyde sensitivity should avoid.
Are there any warnings about Diazolidinyl Urea?
As a formaldehyde-releaser, it raises concern for those with formaldehyde sensitivities, and many "clean beauty" formulas now avoid this preservative class.
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