murphyPEG-5 Sorbitan Isostearate
molecular structure · PubChem
AKA: Polyethylene Glycol Sorbitan Isostearate, PEG-5 Sorbitan Emulsifier
Plant-Derived
Cleanser
Emulsifier
Not Clean
OriginDerived from sorbitol (a sugar alcohol) and isostearic acid, typically plant-sourced from vegetable oils. Synthesized through esterification of sorbitol with isostearic acid, followed by ethoxylation with polyethylene glycol.
Sorbitan, monoisooctadecanoate, poly(oxy-1,2-ethanediyl) derivatives (5 mol EO average molar ratio)
CAS #
66794-58-9
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2015
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR