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Azobenzene

CAS 103-33-3
8

Safety score · 0–100

Avoid

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

About

An aromatic azo compound with potential carcinogenic properties used primarily as a dye intermediate, restricted in cosmetic products above 0.1%.

Azobenzene is an azo compound used as an intermediate in dye and pigment synthesis. EU classification includes H341 (suspected mutagen) and H400/H410 (aquatic toxicity). The EU Cosmetics Regulation Annex III restricts azobenzene at ≥0.1% in cosmetic products. While primarily an industrial chemical, its azo bond structure raises concerns about potential reduction to aromatic amines, some of which are known carcinogens.

Known concerns

  • Suspected mutagen H341
  • Azo bond reduction concern
  • Aquatic toxicity H400/H410
  • Restricted to ≤0.1% in EU cosmetics

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 — always read the physical product label and consult a healthcare professional for personal concerns.