Peg 100 Stearate

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AKA: ● N
Plant-Derived
Emulsifier
Skin Conditioner
Plant Oil
Clean
Restricted:EWG VERIFIED products cannot contain this ingredient without adequate substantiation.
Formula
C20H40O3
Mol. Weight
328.5
CAS #
9004-99-3
Form
Liquid
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Cleansing Surfactant
Traditional Use
A polyethylene glycol ester developed in the mid-20th century as an emulsifier and solubilizer in cosmetics to improve product stability and spreadability.
EWG
2
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
ewg-2
pregnancy-nursing-safe
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory0 listings
🛡️Safety-assessed3 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR