Myristyl Stearate

AKA: Tetradecyl octadecanoate, Octadecanoic acid, Tetradecyl ester, Tetradecyl stearate, STEARIC ACID, TETRADECYL ESTER, Hest MS, Tetradecanyl octadecanoate, 1-Tetradecanol, Schercemol MS
Plant-Derived
Emollient
Skin Conditioner
Clean
OriginDerived from coconut oil, palm kernel oil, or synthesized fatty acids from petroleum-based sources. Produced through esterification of myristic acid and stearyl alcohol under catalytic conditions.
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
C32H64O2
Mol. Weight
480.80
CAS #
17661-50-6
Form
Liquid
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
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
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed4 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Skin Irritant
5 studies / 5 not irritating (CIR 189 and 623)
Eye Irritant in Testing
1 study / 1 irritating / reactions slight (CIR 189)
Concentration Guide
CIR's newest survey reports no concentration of use.
CIR · 2012 survey
Regulatory Agencies
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR
murphy