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Preservative

SODIUM UNDECYLENATE

CAS 3398-33-2 Updated
60

Safety score · 0–100

Fine

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

About

The sodium salt of undecylenic acid (from castor oil) used as an antifungal preservative. EU Annex V regulated; well-tolerated at low concentrations but can irritate at higher use levels.

Function

SURFACTANT - EMULSIFYINGPRESERVATIVESURFACTANT - CLEANSING

Skin benefits

  • Antimicrobial preservative against fungi/yeast
  • Mild surfactant action
  • Plant-derived from castor oil
  • Compatible with anti-dandruff formulas

Known concerns

  • EU Annex V preservative — concentration limit applies
  • Possible irritation at higher levels
  • Not for prolonged leave-on at high %

References

EU

EU CosIng database

European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.

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MEA-UNDECYLENATE
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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.