Polyglyceryl-3 Diisostearate

Polyglyceryl-3 Diisostearate 1
Plant-Derived
Cleanser
Emulsifier
Clean
1,2,3-Propanetriol, homopolymer, isodecanoates (1:2) (3 mol glycerol average molar ratio)
Family
Unknown (Not directly plant-derived)
CAS #
66082-42-6, 85666-92-8
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Emulsifier
Brightens Skin
Mixes Oil & Water
Traditional Use
Developed in the mid-20th century as a modern synthetic emulsifier derived from glycerin and isostearic acid. Created to provide stable emulsification in cosmetic formulations where traditional plant-based emulsifiers proved insufficient.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
ewg-1
medical-approval
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 →
⚖️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