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Restricted / prohibited substance

Azobenzene

CAS 103-33-3
5

Safety score · 0–100

Avoid

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

An industrial azo dye intermediate with established carcinogenic, genotoxic, and irritant properties. Not used in compliant cosmetic products, and listed on California Proposition 65 as a carcinogen.

Skin benefits

  • Industrial intermediate in dye and pigment synthesis
  • Useful research chemical for photoswitching and material science

Known concerns

  • Classified as a suspected carcinogen by IARC, NTP and OSHA
  • Listed on California Proposition 65 as a carcinogen
  • Can metabolise to benzidine, a known human carcinogen
  • Genotoxic and toxic to liver
  • Not appropriate for any cosmetic use

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.