Cetearyl Isononanoate
AKA “CETOSTEARYL ISONONANOATE (EP IMPURITY), CETOSTEARYL ISONONANOATE [EP IMPURITY], CETOSTEARYL ISONONANOATE (EP MONOGRAPH), CETOSTEARYL ISONONANOATE [EP MONOGRAPH], SABODERM CSN, TEGOSOFT CI, CETIOL SN, RefChem:575337, CETOSTEARYL ISONONANOATE
Synthetic
Ingredient Facts
Cetearyl isononanoate
AKA: CETOSTEARYL ISONONANOATE (EP IMPURITY), CETOSTEARYL ISONONANOATE [EP IMPURITY], CETOSTEARYL ISONONANOATE (EP MONOGRAPH), CETOSTEARYL ISONONANOATE [EP MONOGRAPH], SABODERM CSN, TEGOSOFT CI, CETIOL SN, RefChem:575337, CETOSTEARYL ISONONANOATE
Synthetic · Emollient · EWG: 1
Synthetic
Emollient
Emulsifier
Synthetic
Clean
The CIR Expert Panel concluded that the alkyl esters, listed subsequently, are safe in the present practices of use and concentration described in this safety assessment when formulated to be non-irritating.
Effective at 25.02%
Formula
C25H50O2
Mol. Weight
382.70
CAS #
111937-03-2
Form
Liquid
See origin →
Functions
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Softens & Smooths
Conditions Hair
Conditions Skin
Smooths and softens skin
Softens and detangles hair
Traditional Use
A modern synthetic ester developed as an emollient in cosmetic formulations. This impurity represents residual material from industrial synthesis rather than a traditionally used ingredient.
Skin Types
all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
all-shades-safe
Concentration Guide
0.05%
50.0%
0%70%
Effective Range
CIR reported use: 7-15 | 0.2-40 | 0.05-50
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR