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Hair Dye

RESORCINOL

CAS 108-46-3 Updated
32

Safety score · 0–100

Caution

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

About

A hair-dye coupler that helps form permanent colour — but a documented skin sensitiser and suspected thyroid disruptor. EU restricts it to oxidative dye products at strict concentration caps.

Skin benefits

  • Effective coupler in oxidative hair dyes
  • Long industrial track record
  • Some topical anti-acne efficacy at OTC concentrations

Known concerns

  • Established skin sensitiser with positive patch-test results
  • Suspected thyroid endocrine disruptor
  • EU Annex III tightly restricts use to oxidative hair dye (max 1.25%)
  • Banned in EU leave-on cosmetics other than specified hair applications

References

EU

EU CosIng database

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

PC

PubChem

U.S. NIH compound data, GHS hazard codes and toxicity literature.

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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.