PEG-100 Castor Oil
AKA: Polyethylene glycol 100 castor oil
Plant-Derived
Cleanser
Emulsifier
Plant Oil
Not Clean
Castor oil, ethoxylated (100 mol EO average molar ratio)
Family
Euphorbiaceae (Spurge family)
Plant Part
Seed
CAS #
61791-12-6
Form
Oil
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Cleansing Surfactant
Emulsifier
Removes Impurities
Mixes Oil & Water
Traditional Use
A synthetic emulsifier and solubilizer created by polyethylene glycol modification of castor oil, which has been used medicinally for centuries. Developed in the 20th century to make castor oil's traditional emollient and laxative properties more suitable for stable cosmetic formulations.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: CosIng · EWG · CIR