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Preservative

1,3-Bis(hydroxymethyl)imidazolidine-2-thione

CAS 15534-95-9
20

Safety score · 0–100

Caution

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

An imidazolidine-thione with two N-hydroxymethyl groups — a formaldehyde-donor-style actor. EU restrictions on formaldehyde donors plus sensitisation make it a no-go.

Skin benefits

  • Antimicrobial preservation (industrial)

Known concerns

  • Formaldehyde release / EU restrictions
  • Skin sensitiser
  • Genotoxicity flagged

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.