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Humectant

PEG-4 METHYL ETHER

CAS 9004-74-4 Updated
76

Safety score · 0–100

Fine

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

About

A small methyl-capped PEG — sister to PEG-3 and PEG-7 methyl ethers. Used to dissolve ingredients and add humectancy. Mild but supplier control of 1,4-dioxane is essential for safety.

Function

HUMECTANTSOLVENT

Skin benefits

  • Humectant solvent
  • Improves spreadability and ingredient delivery
  • Mild on skin

Known concerns

  • Small PEG — higher penetration potential
  • Standard PEG dioxane purity caveat

References

EU

EU CosIng database

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

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LACTOBACILLUS/CASTANOPSIS SIEBOLDII BRANCH/LEAF EXTRACT FERMENT FILTRATE
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LACTOBACILLUS/HONEY/HYDROLYZED DUCK FEATHER EXTRACT FERMENT FILTRATE
Humectant

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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.