PEG-5 Sorbitan Isostearate
AKA “Polyethylene Glycol Sorbitan Isostearate, PEG-5 Sorbitan Emulsifier
Surfactant
Ingredient Facts
Peg-5 sorbitan isostearate
AKA: Polyethylene Glycol Sorbitan Isostearate, PEG-5 Sorbitan Emulsifier
Surfactant · Emulsifying · EWG: 4
Plant-Derived
Cleanser
Emulsifier
Not Clean
Sorbitan, monoisooctadecanoate, poly(oxy-1,2-ethanediyl) derivatives (5 mol EO average molar ratio)
CAS #
66794-58-9
See origin →
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Emulsifier
Fights Bacteria
Locks In Moisture
Wound Healing
Mixes Oil & Water
Traditional Use
A modern synthetic emulsifier developed in the 20th century combining sorbitan (derived from sorbitol) with synthetic isostearic acid. Created to stabilize oil-water mixtures in contemporary cosmetics.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR