Octoxynol-20 Carboxylic Acid
AKA “Octoxynol-20 Carboxylic Acid
Synthetic
Ingredient Facts
Octoxynol-20 carboxylic acid
Synthetic · Cleansing · EWG: 4
Synthetic
Cleanser
Synthetic
Clean
Poly(oxy-1,2-ethanediyl), .alpha.-carboxymethyl-.omega.-(4-(tetramethylbutyl)phenyl)oxy- (19 mol EO average molar ratio) Science: Functions: Cleansing, Surfactant - Cleansing Safety Ratings: CIR: Safe as used
Form
Liquid
State
Solid
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.
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Removes Impurities
Cleansing Surfactant
Antioxidant Protection
Reduces Inflammation
Locks In Moisture
Traditional Use
Synthetic surfactant derivative with added carboxylic acid functionality created in the late 20th century. Used as a mild detergent and emulsifier with improved biodegradability in modern cosmetic formulations.
Skin Types
all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
medical-approval
all-shades-safe
Mild Irritant
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR