Sodium Oleyl Methyl Isethionate
AKA “SOMI, Oleic Acid Surfactant
Surfactant
Ingredient Facts
Sodium oleyl methyl isethionate
AKA: SOMI, Oleic Acid Surfactant
Surfactant · Cleansing · EWG: 4
Synthetic
Cleanser
Not Clean
9-Octadecenoic Acid (9Z)-, Methyl-2-Sulfoester, Sodium Salt
CAS #
880353-25-3
Form
Liquid
See origin →
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Foam Boosting
Surfactant Foam Boosting
Anti-Inflammatory
Antimicrobial
Fights Acne
Removes dirt and impurities
Enhances lather
Traditional Use
Developed in the late 20th century as a mild synthetic surfactant. Created to provide gentle cleansing suitable for sensitive skin and personal care formulations.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Potential Sensitizer
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: CosIng · EWG · CIR