C30-50 Alkyl Stearate
AKA “Alkyl Stearate, Fatty Acid Ester
Skin Conditioning
Ingredient Facts
C30-50 alkyl stearate
AKA: Fatty Acid Ester
Skin Conditioning · Skin Conditioning · EWG: 4
Plant-Derived
Skin Conditioner
Plant Oil
Not Clean
C30-50-alkyl octadecanoate
CAS #
223239-94-9
Form
Liquid
See origin →
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.
Locks in moisture
Traditional Use
A synthetic ester derived from stearic acid (a fatty acid found in animal fats and vegetable oils) and long-chain alcohols, developed to replace natural waxes and fats in modern cosmetic formulations for improved stability.
Skin Types
all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
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
Safety Assessment of Polyglyceryl Fatty Acid Esters as Used in Cosmetics
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
C16-36 Alkyl Stearate
European Commission
EU Cosmetic Ingredient Database (CosIng)
C20-40 Alkyl Stearate
European Commission
EU Cosmetic Ingredient Database (CosIng)
C30-50 Alkyl Stearate
European Commission
EU Cosmetic Ingredient Database (CosIng)
C32-36 Isoalkyl Stearate
European Commission
EU Cosmetic Ingredient Database (CosIng)
C40-60 Alkyl Stearate
European Commission
EU Cosmetic Ingredient Database (CosIng)
C20-40 Alkyl Stearate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
C32-36 Isoalkyl Stearate
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Eye and skin irritation tests on the rabbit of several fatty acid esters.
Guillot JP, Giauffret JY, Martini MC, Gonnet JF, Soulé G
International journal of cosmetic science, 1979
Eye and skin irritation tests on the rabbit of several fatty acid esters.
Guillot JP, Giauffret JY, Martini MC, Gonnet JF, Soulé G
International journal of cosmetic science, 1979
Eye and skin irritation tests on the rabbit of several fatty acid esters.
Guillot JP, Giauffret JY, Martini MC, Gonnet JF, Soulé G
International journal of cosmetic science, 1979
Eye and skin irritation tests on the rabbit of several fatty acid esters.
Guillot JP, Giauffret JY, Martini MC, Gonnet JF, Soulé G
International journal of cosmetic science, 1979
Polyglycerol fatty acid ester surfactant-based microemulsions for targeted delivery of ceramide AP into the stratum corneum: formulation, characterisa
Sahle FF, Metz H, Wohlrab J, Neubert RH
European journal of pharmaceutics and biopharmaceutics : official journal of Arbeitsgemeinschaft fur Pharmazeutische Verfahrenstechnik e.V, 2012
Verified Jun 2026
Data: CosIng · EWG · CIR