Sodium Isostearoyl Lactylate

Sodium Isostearoyl Lactylate 1
molecular structure · PubChem CID 23662614
AKA: Sodium isostearoyl-2-lactylate, 66988-04-3, PATIONIC ISL, PRIAZUL 2133, Isooctadecanoic acid, 2-(1-carboxyethoxy)-1-methyl-2-oxoethyl ester, Sodium salt, Sodium 2-(1-carboxylatoethoxy)-1-methyl-2-oxoethyl isooctadecanoate, ISOSTEAROYL-2-LACTYLATE SODIUM
Plant-Derived
Cleanser
Emulsifier
Clean
OriginDerived from coconut, palm kernel, or soybean oils as the primary natural starting materials. Produced through esterification of isostearic acid with lactic acid, then neutralized with sodium hydroxide.
Sodium 2-(1-carboxylatoethoxy)-1-methyl-2-oxoethyl isooctadecanoate
Formula
C24H43NaO6
Mol. Weight
450.60
CAS #
66988-04-3
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Cleansing Surfactant
Emulsifier
Removes Impurities
Mixes Oil & Water
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed3 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
Skin Irritant in Testing
2 studies / 2 irritating / reactions slight to severe (CIR 774)
Mixed Eye Irritation Results
2 studies / 1 irritating / 1 not irritating (CIR 774)
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2024
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR