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Reducing agent (prohibited)

Thiourea and its derivatives, with the exception of the one listed in Annex III

CAS 62-56-6
14

Safety score · 0–100

Avoid

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

Thiourea is broadly prohibited in EU cosmetics because of carcinogenicity, reproductive toxicity and contact allergy. Only a narrow Annex III derivative is allowed under restrictions.

Skin benefits

  • Historic reducing agent and chelator
  • Used in industrial photographic and metal processes

Known concerns

  • EU Annex II prohibits thiourea in cosmetics
  • Classified as suspected carcinogen (Carc. 2) and reproductive toxicant
  • Skin sensitizer with documented contact allergy
  • Thyroid effects in animal studies
  • Only specific derivative on Annex III allowed

References

EU

EU CosIng database

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

Check your shelf

Find Thiourea and its derivatives, with the exception of the one listed in Annex III in your products.

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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.