Potassium Hydroxystearate

AKA: Potassium 12-hydroxystearate, 34326-46-0, Octadecanoic acid, Potassium salt (1:1), (+-)-POTASSIUM HYDROXYSTEARATE, POTASSIUM HYDROXYSTEARATE [INCI]
Plant-Derived
Cleanser
Not Clean
OriginDerived from plant oils such as coconut, palm kernel, or soybean oils through saponification. Created by treating fatty acids with potassium hydroxide to form potassium salts of hydroxystearic acid.
The CIR Expert Panel concluded that the following ingredients are safe in the present practices of use andconcentration described in the safety assessment when formulated to be non-irritating and non-sensitizing, which may be basedon a QRA...Potassium Hydroxystearate...
Formula
C18H35KO3
Mol. Weight
338.60
CAS #
34326-46-0
Form
Liquid
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Cleansing Surfactant
Removes Impurities
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed1 review →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
4
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
CIR lists it as not reported to be in use.
CIR · report published 2019
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR