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pH Adjuster

Ammonia

CAS 7664-41-7 / 1336-21-6
35

Safety score · 0–100

Caution

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

Ammonia — the classic alkali for permanent hair dyes. Effective but irritating to eyes, lungs and skin; strictly capped in cosmetic use.

Skin benefits

  • Strong base for hair-dye chemistry
  • Opens hair cuticle for color penetration
  • Decades of professional use

Known concerns

  • Strong respiratory and eye irritant
  • Skin burns at high %
  • EU Annex III restricted concentrations
  • Sensitization in salon staff

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.