C30-50 Alkyl Stearate

AKA: Fatty Acid Ester

Plant-Derived

Skin Conditioner

Plant Oil

Not Clean

C30-50-alkyl octadecanoate

CAS #

223239-94-9

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.

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.

EWG

CIR

Safe as used

Pregnancy

Yes

CIR Safety Findings

Not a Sensitizer

medical-approval

all-shades-safe

Regulatory Status

USA✔ permitted

EU⚠ restricted

JAPAN⚠ restricted

CANADA⚠ restricted

Regulatory Agencies

EWG CIR FDA EU COSING Health Canada

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: CosIng · EWG · CIR