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

Other

15

Avoid

CAS Number: 15534-95-9

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

A formaldehyde-releasing preservative classified as a reproductive toxin — may damage the unborn child.

Detailed Analysis

1,3-Bis(hydroxymethyl)imidazolidine-2-thione is a preservative that releases formaldehyde. GHS classifications are severe: H317 (skin sensitizer) and H360D (may damage the unborn child), with a 'Danger' signal word. The H360D classification as a Category 1B reproductive toxin is particularly concerning. It is restricted to 2% maximum in cosmetic products but the reproductive toxicity classification severely limits its desirability.

Known Concerns

  • ⚠ May damage the unborn child (H360D)
  • ⚠ Skin sensitizer (H317)
  • ⚠ Formaldehyde releaser
  • ⚠ Reproductive toxin

Safety Score

15

Avoid

Based on EU regulatory data, published safety research, and ingredient function analysis.

References

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EU CosIng Database

European Commission cosmetic ingredient registry

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This information is for educational purposes only and does not constitute medical advice. Always consult a healthcare professional for skin concerns or allergies.