Oleyl Alcohol
AKA “(Z)-octadec-9-en-1-ol, 143-28-2, Ocenol, cis-9-Octadecen-1-ol, Dermaffine, Lancol, Novol, Oceol, Oleol
Emollient
Ingredient Facts
Oleyl alcohol
AKA: (Z)-octadec-9-en-1-ol, 143-28-2, Ocenol, Cis-9-Octadecen-1-ol, Dermaffine, Lancol, Novol, Oceol, Oleol
Emollient · Emollient · EWG: 1
Synthetic
Emollient
Fragrance
Solvent
Skin Conditioner
Clean
(9Z)-octadecen-1-ol is a long chain fatty alcohol that is octadecanol containing a double bond located at position 9 (the Z-geoisomer). It has a role as a metabolite and a nonionic surfactant. It is a long-chain primary fatty alcohol and a fatty alcohol 18:1.
Solubility Insol in water; sol in alcohol, ether
Formula
C18H36O
Mol. Weight
268.50
CAS #
143-28-2, 593-47-5
Form
Liquid
State
Liquid; Liquid, Other Solid
See origin →
Functions
Perfuming
Added for scent. Can be natural or synthetic. Common irritant and allergen — one of the top reasons people react to products.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Viscosity Controlling
Locks In Moisture
Traditional Use
Derived from oleic acid found in olive oil and other plant oils used for centuries in traditional medicine and skincare. Modern synthetic production began in the early 20th century for use as an emollient and emulsifier in cosmetics.
Skin Types
all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Final Report on the Safety Assessment of Stearyl Alcohol, Oleyl Alcohol, and Octyl Dodecanol
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Bis-Isostearyl 1,4-Butanediol/HDI/Hydrogenated Dimer Dilinoleyl Alcohol Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
HDI/Di-C12-14 Alkyl Tartrate/Hydrogenated Dilinoleyl Alcohol Copolymer
European Commission
EU Cosmetic Ingredient Database (CosIng)
Oleyl Alcohol
European Commission
EU Cosmetic Ingredient Database (CosIng)
Oleyl Alcohol
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Time-Dependent Differences in the Effects of Oleic Acid and Oleyl Alcohol on the Human Skin Barrier.
Kováčik A, Kopečná M, Hrdinová I, Opálka L, Boncheva Bettex M et al.
Molecular pharmaceutics, 2023
Permeation Enhancer in Microemulsions and Microemulsion-Based Gels: A Comparison of Diethylene Glycol Monoethyl Ether and Oleyl Alcohol.
Pandey S, Baki G
Gels (Basel, Switzerland), 2025
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR