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Benzimidazol-2(3H)-one

CAS 615-16-7
50

Safety score · 0–100

Moderate

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

About

A heterocylic benzimidazole derivative that acts as a masking agent and hair dyeing component in permanent hair dye formulations.

Benzimidazol-2(3H)-one is the inner amide/ lactam form of 2-aminobenzimidazole. It functions as a precursor in oxidative hair dye systems where it reacts with couplers to form indo dyes. In the EU, certain benzimidazole derivatives used as hair dyes are subject to restrictions under Annex III of Regulation (EC) No 1223/2009; this specific substance requires particular caution due to potential sensitization from benzimidazole structures.

Skin benefits

  • Used in oxidative hair dye systems for color development

Known concerns

  • Potential skin sensitizer in hair dye applications
  • May require declaration under EU Fragrance Allergen regulations if applicable

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.