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Restricted hair dye precursor

4-Aminophenol

CAS 123-30-8
32

Safety score · 0–100

Caution

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

Oxidative hair dye precursor used in permanent hair colorants. Strictly regulated under EU Annex III due to skin sensitization potential and limited to professional or supervised consumer use.

Skin benefits

  • Oxidative hair dye coupler producing warm shade tones
  • Long history of use in permanent hair colorants under regulated limits

Known concerns

  • Listed in EU Annex III with strict maximum on-head concentration (1.0%)
  • Documented skin sensitizer; allergic contact dermatitis reported
  • Suspected genotoxic in some assay systems
  • Restricted to oxidative hair dye use only, prohibited in eyelash/eyebrow products

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.