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Preservative

IMIDAZOLIDINYL UREA

CAS 39236-46-9
38

Safety score · 0–100

Caution

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

A formaldehyde-releasing preservative — effective against microbes but releases trace formaldehyde, a known sensitizer and IARC Group 1 carcinogen. EU caps use at 0.6%; many brands now avoid.

Skin benefits

  • Effective broad-spectrum preservative
  • Active against bacteria and yeast
  • Used at 0.6% max in EU

Known concerns

  • Formaldehyde donor — releases trace formaldehyde
  • Skin sensitizer on repeated exposure
  • Linked to contact dermatitis
  • Formaldehyde is IARC Group 1 carcinogen

References

EU

EU CosIng database

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

PC

PubChem

U.S. NIH compound data, GHS hazard codes and toxicity literature.

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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.