PEG-5 Soy Sterol
AKA “Polyethylene Glycol Soy Sterol, PEG-5 Soybean Sterol”
Surfactant
Ingredient Facts
Peg-5 soy sterol
AKA: Polyethylene Glycol Soy Sterol, PEG-5 Soybean Sterol
Surfactant · Emulsifying · EWG: 4
Synthetic
Cleanser
Emulsifier
Amino Acid
Not Clean
Sterols, soya (Glycine soja), ethoxylated (5 mol EO average molar ratio)
CAS #
61791-24-0
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 polyethylene glycol derivative of plant sterols from soybeans, developed in the late 20th century as a conditioning and emulsifying agent with no significant traditional cosmetic history.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Allergen Warning
⚠️ Soy
EWG
4
CIR
Reviewed by CIR
Pregnancy
Yes
CIR Safety Findings
all-shades-safe
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR