DMDM Hydantoin
INCI: Formaldehyde-Releasing Preservative
Reviewed by Emma · Last updated 18 Aug 2026
Also known as: Formaldehyde-Releasing Preservative
Synthetic, formaldehyde-releasing preservative
EWG Safety Score
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What Is DMDM Hydantoin?
DMDM hydantoin is a synthetic, formaldehyde-releasing preservative that has mixed research on its potential to aggravate skin. Despite its connection to formaldehyde, the Cosmetic Ingredient Review Board has confirmed the safety of this preservative in three separate reviews, each spaced several years apart.
Clinical Evidence & References
Published Research
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Medocyna Pracy, Volume 66, Issue 3, 2015, pages 327-332 [URL not available] Medocyna Pracy, 2015
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Contact Dermatitis, January 2010, pages 18-31 [URL not available] Contact Dermatitis, 2010
From the Clinic
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Dichlorophenyl Imidazoldioxolan
An purifying ingredient that helps regulate excess sebum production
Diglucosyl Gallic Acid
Synthetic antioxidant | Derivative of benzoic acid
Dimethylol Urea
A preservative system with purifying properties to help maintain product stability
Encapsulated Salicylic Acid
Time-released BHA for gentle yet effective exfoliation
Ethylhexylglycerin
Skin-softening agent with mild humectant (hydration boosting) properties Multitasks with preservative capabilities to improve formulary stability
Ethylparaben
Not available for this ingredient.
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