Undecylenamidopropyl Betaine
AKA: (Carboxymethyl)dimethyl(3-((1-oxoundecenyl)amino)propyl)ammonium hydroxide, (Carboxymethyl)dimethyl[3-[(1-oxoundecenyl)amino]propyl]ammonium hydroxide
Synthetic
Cleanser
Skin Conditioner
Hair Care
Plant Oil
Clean
(Carboxymethyl)dimethyl[3-[(1-oxoundecenyl)amino]propyl]ammonium hydroxide
Formula
C18H36N2O4
Mol. Weight
344.50
CAS #
98510-75-9
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.
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
A modern synthetic amphoteric surfactant created from undecylenic acid and betaine. Designed for gentle cleansing in personal care products, combining antimicrobial properties with mildness to skin.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR