Aluminum Isostearates/Stearates
AKA “Aluminum Fatty Acid Salts
Synthetic
Ingredient Facts
Aluminum isostearates/stearates
AKA: Aluminum Fatty Acid Salts
Synthetic · Emulsion Stabilising · EWG: 4
Plant-Derived Synthetic
Emulsifier
Synthetic
Clean
Isostearic acid, stearic acid, mixture, aluminum salt Science: Origin: Botanic/Natural | Functions: Anticaking, Emulsion Stabilising, Opacifying, Viscosity Controlling Safety Ratings: CIR: Safe as used
Form
Wax
See origin →
Functions
Anticaking
Emulsion Stabilising
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Opacifying
Viscosity Controlling
Prevents Clumping
Stabilizes Emulsion
Adds Opacity
Controls Viscosity
Keeps product blended
Creates creamy opacity
Controls product thickness
Traditional Use
Modern synthetic emulsifier blend used in cosmetics since the mid-20th century. Created as a stable alternative to soap-based and plant-derived emulsifying agents.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR