Isodecyl Stearate
AKA: 31565-38-5, Octadecanoic acid, Isodecyl ester, STEARIC ACID, ISODECYL ESTER, ISODECYL STEARATE [INCI], 250-704-9, 8-methylnonyl octadecanoate
Plant-Derived
Emollient
Skin Conditioner
Not 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.
Formula
C28H56O2
Mol. Weight
424.70
CAS #
31565-38-5
Form
Liquid
Functions
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
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
Modern synthetic ester created as a cosmetic emollient and skin-conditioning agent. Developed to provide spreadability and moisture retention in formulations without a traditional or historical use.
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR