PEG-8 Diisostearate
AKA “Polyethylene Glycol 8 Diisostearate, PEG-8 Diisostearic Acid Ester
Synthetic
Ingredient Facts
Peg-8 diisostearate
AKA: Polyethylene Glycol 8 Diisostearate, PEG-8 Diisostearic Acid Ester
Synthetic · Emollient · EWG: 4
Plant-Derived Synthetic
Emollient
Cleanser
Emulsifier
Skin Conditioner
Synthetic
Clean
Poly(oxy-1,2-ethanediyl), .alpha.-hydro-.omega.-hydroxy-, diesters with isooctadecanoic acid (8 mol EO average molar ratio) Science: Origin: Botanic/Natural | Process: Ethoxylation | Functions: Surfactant - Emulsifying Safety Ratings: CIR: Safe as used
Form
Liquid
See origin →
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.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Emulsifier
Mixes Oil & Water
Traditional Use
Modern emulsifier created from branched stearic acid derivatives and PEG technology in the 20th century. Developed to improve the stability and texture of oil-based and mixed-phase cosmetic products.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe w/Qualifications
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR