Isomerized Linoleic Acid

Isomerized Linoleic Acid 1
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Isomerized Linoleic Acid 2
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Isomerized Linoleic Acid 3
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AKA: Polymerized Linoleic Acid
Synthetic
Occlusive
Skin Conditioner
Acid
Clean
OriginDerived from plant oils such as soybean, safflower, or sunflower seed oils containing linoleic acid. Produced through isomerization, a chemical process that rearranges the double bond positions in the fatty acid structure.
9,12-octadecadienoic acid, isomerized
Form
Powder
State
Solid
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
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
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
Leave-on0.1–0.75%
Rinse-offNot reported
0%50%100%
CIR reported use · 2016 survey
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR