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Phytosteryl Isostearate
AKA “Plant sterol isostearate”
Synthetic
Ingredient Facts
Phytosteryl isostearate
AKA: Plant sterol isostearate
Synthetic · Hair Conditioning · EWG: 4
Plant-Derived Synthetic
Skin Conditioner
Hair Care
Synthetic
Clean
16-Methylheptadecanoic acid, phytosterols ester Science: Origin: Botanic/Natural | Functions: Hair Conditioning, Skin Conditioning Safety Ratings: CIR: Safe as used
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
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Insufficient
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Status
USAunder review
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Feb 2026
Data: CosIng · EWG · CIR