PEG-58 Hydrogenated Castor Oil Isostearate
AKA “Polyethylene glycol hydrogenated castor oil isostearate”
Carrier Oil
Ingredient Facts
Peg-58 hydrogenated castor oil isostearate
AKA: Polyethylene glycol hydrogenated castor oil isostearate
Carrier Oil · Emulsifying · EWG: 4
Plant-Derived
Cleanser
Emulsifier
Plant Oil
Not Clean
Castor oil (Ricinus communis), hydrogenated, ethoxylated, monoisooctadecanoate (58 mol EO average molar ratio)
Family
Euphorbiaceae (Spurge family)
Plant Part
Seed
Form
Oil
See origin →
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Viscosity Controlling
Emulsifier
Controls Viscosity
Mixes oil and water
Controls product thickness
Traditional Use
Developed in the mid-20th century as a synthetic emulsifier combining polyethylene glycol (PEG) with hydrogenated castor oil derivatives. Used in modern cosmetics to solubilize oils and create stable emulsions, replacing traditional plant-based emulsifying methods.
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 Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR