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pH Adjuster

POTASSIUM SODIUM TARTRATE

CAS 304-59-6 Updated
92

Safety score · 0–100

Excellent

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

About

Rochelle salt — a food-grade potassium-sodium salt of tartaric acid that buffers pH and lightly chelates metal ions. Decades of safe culinary and cosmetic use; non-irritating at typical levels.

Function

BUFFERING

Skin benefits

  • pH buffering
  • Mild chelation
  • Formulation stability

Known concerns

  • No significant concerns at cosmetic concentrations

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.