Stearyl Betaine
AKA “stearylbetaine, N-Stearylbetaine, Lonzaine 18S, Stearyldimethylbetaine, Stearyl dimethyl glycine, (Carboxymethyl)octadecyldimethylammonium hydroxide inner salt, 0J4V7PZ3Q6, NSC 9859, NSC-9859
Surfactant
Ingredient Facts
Stearyl betaine
AKA: Stearylbetaine, N-Stearylbetaine, Lonzaine 18S, Stearyldimethylbetaine, Stearyl dimethyl glycine, (Carboxymethyl)octadecyldimethylammonium hydroxide inner salt, 0J4V7PZ3Q6, NSC 9859, NSC-9859
Surfactant · Cleansing · EWG: 4
Plant-Derived
Cleanser
Skin Conditioner
Hair Care
Plant Oil
Not Clean
(Carboxylatomethyl)dimethyl(octadecyl)ammonium
Formula
C22H45NO2
Mol. Weight
355.60
CAS #
820-66-6
Form
Liquid
See origin →
Functions
Antistatic
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Foaming
Hair Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Foam Boosting
Viscosity Controlling
Locks in moisture
Traditional Use
Developed as an amino acid-derived compound in late 20th century cosmetic science. Created to provide mild cleansing and conditioning properties with reduced irritation.
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USApermitted
EUrestricted
JAPANrestricted
CANADArestricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR