Preservative
DMDM HYDANTOIN
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A formaldehyde-releasing preservative — kills microbes by slowly releasing formaldehyde in the product. Effective but a known sensitizer; many brands have phased it out due to allergy concerns.
Function
Skin benefits
- Effective broad-spectrum preservative
- Prevents bacterial and fungal spoilage
- Stable across pH range
Known concerns
- Formaldehyde releaser — releases free formaldehyde in product
- Skin sensitization and allergic contact dermatitis
- Concern for formaldehyde-sensitive consumers
- Increasingly restricted; EU max 0.6% with labeling
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
PubChem
U.S. NIH compound data, GHS hazard codes and toxicity literature.
Related preservatives
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.