DMDM Hydantoin
Formaldehyde-releasing preservative. Slowly releases formaldehyde, which kills bacteria. Controversial due to formaldehyde's carcinogenicity via inhalation.
Evidence by route
Topical application
DVery weak or conflicting data.
A preservative, not an active ingredient. CIR deemed safe at up to 0.2%, but contact allergy rates are higher than for phenoxyethanol and parabens. IARC classified formaldehyde as a Group 1 carcinogen (inhalation route). Systemic exposure from topical use is minimal, but consumers increasingly avoid products containing this ingredient.
- de Groot AC et al. Contact Dermatitis. 2009;61(2):63-85.
- IARC Monographs Vol. 100F. 2012.
Tolerability and safety
Irritation potential
MediumAllergen risk
HighPregnancy
CautionFor sensitive skin
Formaldehyde is the number one contact allergen. People with sensitive skin and eczema are particularly prone to sensitization.
Skin types
Suitable for
Use with caution
Frequently asked questions
Is DMDM Hydantoin safe during pregnancy?
DMDM Hydantoin should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.
What skin types is DMDM Hydantoin for?
DMDM Hydantoin suits: normal. Use with caution in: sensitive, dry.
Can DMDM Hydantoin irritate the skin?
DMDM Hydantoin has moderate irritation potential. Sensitive skin may show a transient reaction that usually settles with adaptation.
Can DMDM Hydantoin cause an allergic reaction?
DMDM Hydantoin has high allergen potential. Perform a patch test on the inner forearm 24 hours before facial application.