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pH Adjuster

GUANIDINE CARBONATE

CAS 593-85-1 Updated
30

Safety score · 0–100

Caution

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

About

A strong alkaline salt used mostly in hair relaxers and as a pH adjuster. Corrosive raw material with documented eye-damage hazards; never appropriate for leave-on skin care.

Function

BUFFERINGSKIN CONDITIONING

Skin benefits

  • pH adjuster in hair-relaxer systems
  • Strong alkali source

Known concerns

  • Causes serious eye damage (GHS H318)
  • Harmful if swallowed (H302)
  • May cause respiratory irritation (H335)
  • Strongly alkaline — corrosive to skin
  • Inappropriate for leave-on cosmetics

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.