PEG-4 Diisostearate

AKA: Polyethylene glycol 4 diisostearate

Plant-Derived

Cleanser

Emulsifier

Not Clean

OriginDerived from diisostearic acid (a synthetic fatty acid) and polyethylene glycol (petroleum-derived polymer). Produced through esterification of diisostearic acid with PEG-4, followed by ethoxylation to create the polycondensate.

Poly(oxy-1,2-ethanediyl), .alpha.-(1-oxoisooctadecyl)-.omega.-[(1-oxoisooctadecyl)oxy]- (4 mol EO average molar ratio)

Form

Liquid

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

Functions

Emulsifying

Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.

Emulsifier

Locks In Moisture

Wound Healing

Antioxidant Protection

Mixes Oil & Water

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.

EWG

CIR

Safe as used

Pregnancy

Yes

Restricted By

Credo Beauty Whole Foods Premium Body Care Beauty Heroes MADE SAFE EWG VERIFIED

Concentration Guide

CIR lists it as not reported to be in use.

CIR · report published 2015

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Verified Jun 2026

Data: CosIng · EWG · CIR