The Lab
Specimen No. 0021
AvoidSyntheticemulsifierhumectant

PEGs (Polyethylene Glycols)

peg-4 · peg-6 · peg-10

Petroleum-derived compounds used as emulsifiers and humectants. Can be contaminated with 1,4-dioxane and ethylene oxide — both carcinogenic.

high confidence
Researched April 18, 2026

Concerns

  • 1,4-dioxane contamination (probable carcinogen, EPA Group B2)
  • Ethylene oxide contamination (IARC Group 1 carcinogen)
  • May enhance skin penetration of other chemicals
  • Petroleum-derived

Regulatory flags

  • Ethoxylation process can introduce 1,4-dioxane (IARC Group 2B)
  • EU requires impurity testing — 1,4-dioxane ≤10 ppm

Commonly found in

MoisturizerShampooConditionerSunscreenMakeup

Research disclaimer: This rating is based on available peer-reviewed research and regulatory assessments at the time of publication. It is not medical advice. Consult a qualified professional for personal health or skin concerns.

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