Sorbeth-40 Pentaisostearate
AKA “Sorbitan Polysorbate Ester
Synthetic
Ingredient Facts
Sorbeth-40 pentaisostearate
AKA: Sorbitan Polysorbate Ester
Synthetic · Cleansing · EWG: 4
Plant-Derived
Cleanser
Emulsifier
Synthetic
Clean
D-Glucitol, ethoxylated, pentaisooctadecanoate (40 mol EO average molar ratio) Science: Origin: Botanic/Natural | Functions: Surfactant - Cleansing, Surfactant - Emulsifying Safety Ratings: CIR: Safe as used
Effective at 0.7%
See origin →
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Cleansing Surfactant
Emulsifier
Removes Impurities
Mixes Oil & Water
Traditional Use
Synthetic emulsifier developed in the mid-20th century as part of the polysorbate family. Designed to create stable emulsions in cosmetic formulations by combining sorbitol with synthetic fatty acid esters.
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
Concentration Guide
0.5%
0.9%
0%1%
Effective Range
CIR reported use: 0.5-0.9
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR