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Emulsifier

POTASSIUM STEARATE

CAS 593-29-3
78

Safety score · 0–100

Fine

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

The potassium soap of stearic acid — a classic soft-soap emulsifier and cleanser. Gentle for most, but its alkalinity can be drying.

Function

CLEANSINGSURFACTANT - EMULSIFYINGSURFACTANT - CLEANSING

Skin benefits

  • Long-established soap-based emulsifier
  • Cleansing action in syndet-free formulas
  • Simple, well-characterized chemistry

Known concerns

  • Alkaline — can disrupt skin pH in leave-on use
  • Can feel drying in rinse-off at high levels

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, so always read the physical product label and consult a healthcare professional for personal concerns.