DMDM Hydantoin
⚠ EU RestrictedIdentification
CAS Number 6440-58-0
EINECS / EC 229-222-8
CosIng Ref 33723
Chemical Name 1,3-bis(Hydroxymethyl)-5,5-dimethylimidazolidine-2,4-dione
Formula C7H12N2O4
Mol. Weight 188.18 g/mol
Function & Classification
Primary Function Preservative
Origin Synthetic
EU Regulatory Status
Max Leave-on 0.6%
Max Rinse-off 0.6%
Restrictions 0.6%
Conditions of Use Max 0.6% formaldehyde equivalent. Counted toward total formaldehyde limit of 0.2%.
Mandatory Warning Contains DMDM Hydantoin. Releases formaldehyde.
SCCS Opinion View SCCS opinion →
Safety Profile
2 / 10
Known Contact Sensitizer Known to cause allergic contact dermatitis with repeated use or high concentrations.
Skin Type Compatibility
Fungal Acne Safe ✓ Safe
Toxicology Profile
NOAEL 75 mg/kg bw/day (oral, rat) CIR 2017
Sensitization Non-sensitizer
Genotoxicity Non-genotoxic
Phototoxicity Non-phototoxic
LD₅₀ Oral 2260 mg/kg (rat)
Skin Irritation (Draize) 0.8 / 4.0
Eye Irritation (Draize) 1.5 / 4.0
Source SCCS Opinion ↗
Formulation Guidelines
Usage level, pH range, solubility and addition phase not yet available.
Usage Level % · Addition Phase · Solubility
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