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PEG-3 ISOSTEARATE

CAS 56002-14-3
78

Safety score · 0–100

Fine

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

About

A fatty acid ester of polyethylene glycol-3 and isostearic acid, used as an emulsifier and skin conditioning agent in cosmetic formulations.

PEG-3 ISOSTEARATE is produced by esterifying isostearic acid (a branched-chain C18 fatty acid) with approximately 3 moles of ethylene oxide, yielding an oil-in-water emulsifier. The short EO chain allows some degree of skin penetration, but the overall safety profile is favorable. CIR assessment of similar PEG fatty acid esters supports safe cosmetic use. Not restricted in EU Annexes II or III. The branched structure of isostearic acid reduces the risk of oxidation compared to linear fatty acid esters.

Skin benefits

  • emulsifying
  • skin conditioning
  • emollient

Known concerns

  • ethylene oxide contamination (potential)
  • 1,4-dioxane contamination (potential)

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.