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Phytosteryl Isostearate
AKA “Plant sterol isostearate”
Skin Conditioning
Ingredient Facts
Phytosteryl isostearate
AKA: Plant sterol isostearate
Skin Conditioning · Hair Conditioning · EWG: 1
Plant-Derived
Skin Conditioner
Hair Care
Clean
16-Methylheptadecanoic acid, phytosterols ester
Form
Liquid
See origin →
Functions
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.
Locks in moisture
Traditional Use
A modern synthetic ester made from phytosterols and isostearic acid. Developed for use in cosmetics as an emollient and skin-conditioning ingredient.
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR