Sodium Isostearoyl Lactylate

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
Chemical Exfoliant
Plant Oil
Clean
Sodium 2-(1-carboxylatoethoxy)-1-methyl-2-oxoethyl isooctadecanoate
Formula
C24H43NaO6
Mol. Weight
450.60
CAS #
66988-04-3
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
Traditional Use
A modern synthetic emulsifier and conditioning agent developed in the late 20th century for cosmetics. Combines stearic acid derivatives with lactic acid to create stable, skin-conditioning products.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR