Oleyl Stearate

AKA: 17673-50-6, Octadecanoic acid, (9Z)-9-octadecen-1-yl ester, Cis-9-Octadecenyl Stearate, 9Z-octadecenyl octadecanoate, 9-octadecenyl ester, Stearic acid
Plant-Derived
Emollient
Skin Conditioner
Plant Oil
Not Clean
(Z)-Octadec-9-enyl octadecanoate
Formula
C36H70O2
Mol. Weight
534.90
CAS #
17673-50-6
Form
Liquid
Functions
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Locks In Moisture
Traditional Use
Developed as a synthetic ester combining oleyl alcohol with stearic acid. Created as an emollient and skin-conditioning agent in modern cosmetic formulations.
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Skin Types
all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR