Stearamidopropyl Betaine

AKA: (Carboxymethyl)dimethyl-3-[(1-oxooctadecyl)amino]propylammonium hydroxide, 1-Propanaminium, N-(carboxymethyl)-N, Inner salt, Hydroxide, STEARATE AMIDOPROPYLDIMETHYL ACETATE BETAINE, DIMETHYLCARBOXYMETHYLENEPROPYLENEAMIDOSTEARATE-BETAINE, (Carboxymethyl)dimethyl-3-((1-oxooctadecyl)amino)propylammonium hydroxide, (CARBOXYMETHYL)DIMETHYL(3-STEARAMIDOPROPYL)AMMONIUM HYDROXIDE, INNER SALT
Plant-Derived
Cleanser
Skin Conditioner
Hair Care
Plant Oil
Not Clean
(Carboxymethyl)dimethyl-3-[(1-oxooctadecyl)amino]propylammonium hydroxide
Formula
C25H50N2O3
Mol. Weight
426.70
CAS #
6179-44-8
Form
Liquid
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.
Viscosity Controlling
Locks in moisture
Traditional Use
Modern synthetic amphoteric surfactant created by combining stearamide with betaine chemistry. Developed in the late 20th century as a gentler, amphoteric cleansing agent for shampoos and body washes with improved mildness compared to traditional surfactants.
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
Skin Types
all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing
🛡️Safety-assessed0 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR