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Isosteareth-8
AKA “PEG-8 isostearyl ether, Polyoxyethylene isostearyl ether”
Surfactant
Ingredient Facts
Isosteareth-8
AKA: PEG-8 isostearyl ether, Polyoxyethylene isostearyl ether
Surfactant · Cleansing · EWG: 3
Plant-Derived
Cleanser
Not Clean
Isosteareth-8 is a cosmetic ingredient used as cleansing, surfactant - cleansing. Assessed as safe by the CIR.
Effective at 11.51%
CAS #
-
Form
Liquid
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
Traditional Use
Developed as a nonionic surfactant and emulsifier. Used in mid-20th century cosmetics innovation to create stable, mildly cleansing products.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
3
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Concentration Guide
0.02%
23.0%
0%32%
Effective Range
CIR reported use: 18-23 | 0.02-0.4 | 0.2-1
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR