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pH Adjuster

AMMONIUM HYDROXIDE

CAS 1336-21-6 Updated
50

Safety score · 0–100

Moderate

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

About

An alkaline pH adjuster (ammonia in water) used in hair dyes and relaxers. Safe at the very low diluted levels in finished products, but corrosive and irritating in concentrate.

Skin benefits

  • Adjusts pH in formulations
  • Solubilizes ingredients
  • Used in hair color and relaxers

Known concerns

  • Corrosive at high concentration (GHS H314)
  • Eye and respiratory irritant
  • Pungent ammonia odor

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.