Polyglyceryl-4 Isostearate

AKA: Isostearic Acid Polyglyceryl Ester, Emollient

Plant-Derived

Cleanser

Emulsifier

Clean

1,2,3-Propanetriol, homopolymer, isooctadecanoates (1:1) (4 mol glycerol average molar ratio)

CAS #

-

Functions

Emulsifying

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

Emulsifier

Antioxidant Protection

Reduces Inflammation

Locks In Moisture

Mixes Oil & Water

Traditional Use

Developed as a branched-chain polyglyceryl emulsifier for improved spreadability and skin feel. Designed as an alternative to straight-chain emulsifiers for premium cosmetic formulations.

EWG

CIR

Safe as used

Pregnancy

Yes

CIR Safety Findings

Not a Sensitizer

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

Skin Types

●all-skin-types

Best For

General

Pregnancy & Breastfeeding Safe

Yes

The paper trail

🔬Peer-reviewed1 paper →

⚖️Regulatory1 listing →

🛡️Safety-assessed2 reviews →

Counts, not a verdict. A listing isn't a study. The trail, you decide.

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Verified Jun 2026

Data: CosIng · EWG · CIR