DM Hydantoin
AKA “5, 5-DIMETHYLHYDANTOIN, 77-71-4, Dimethylhydantoin, 2, 4-Imidazolidinedione, 5-dimethyl-, Dantoin DMH, 5-Dimethyl-2, 4-imidazolidinedione, Dantoin 736, Hydantoin, 5-Dimethyl hydantoin, DTXSID5021754
Hair Conditioning
Ingredient Facts
Dm hydantoin
AKA: 5, 5-DIMETHYLHYDANTOIN, 77-71-4, Dimethylhydantoin, 2, 4-Imidazolidinedione, 5-dimethyl-, Dantoin DMH, 5-Dimethyl-2, 4-imidazolidinedione, Dantoin 736, 5-Dimethyl hydantoin, DTXSID5021754
Hair Conditioning · Hair Conditioning · EWG: 6
Synthetic
Skin Conditioner
Hair Care
Not Clean
5,5-Dimethylhydantoin is an imidazolidine-2,4-dione.
Solubility Very soluble in ethanol, ether, acetone, benzene, chloroform; soluble in DMSO
Formula
C5H8N2O2
Mol. Weight
128.13
CAS #
77-71-4
Form
Liquid
State
Liquid
See origin →
Functions
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Viscosity Controlling
Conditions Hair
Controls Viscosity
Softens and detangles hair
Controls product thickness
Traditional Use
A synthetic preservative compound developed in the 20th century for cosmetic antimicrobial purposes. Formulated to prevent microbial growth in cosmetic products as an alternative to traditional preservation methods.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Caution
EWG
6
CIR
Reviewed by CIR
Pregnancy
Caution
CIR Safety Findings
all-shades-safe
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Final Report on the Safety Assessment of DMDM Hydantoin
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Report Terminated: DM Hydantoin (not used in cosmetics and personal care products)
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
DM Hydantoin
European Commission
EU Cosmetic Ingredient Database (CosIng)
DMDM Hydantoin
European Commission
EU Cosmetic Ingredient Database (CosIng)
Patch test reactivity to DMDM hydantoin. Relationship to formaldehyde allergy.
de Groot AC, van Joost T, Bos JD, van der Meeren HL, Weyland JW
Contact dermatitis, 1988
DM Hydantoin
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
DMDM Hydantoin
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
5- (α, β-Dibromophenethyl)-5-methylhydantoin
Health Canada
Health Canada Cosmetic Ingredient Hotlist
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR