Sorbeth-40 Pentaisostearate
molecular structure · PubChem
AKA: Sorbitan Polysorbate Ester
Plant-Derived
Cleanser
Emulsifier
Not Clean
D-Glucitol, ethoxylated, pentaisooctadecanoate (40 mol EO average molar ratio)
Effective at 0.7%
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.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
0.5%
0.9%
0%1%
Reported use
CIR reported use: 0.5-0.9
Regulatory Agencies
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: CosIng · EWG · CIR