C10-40 Isoalkyl Acid Phytosterol Esters
AKA “Plant sterol ester, Conditioning agent
Synthetic
Ingredient Facts
C10-40 isoalkyl acid phytosterol esters
AKA: Plant sterol ester, Conditioning agent
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Skin Conditioner
Hair Care
Synthetic
Clean
C10-40 Isoalkyl Acid Phytosterol Esters is a complex mixture of esters of phytosterol and C10-40 Isoalkyl Acid Science: Functions: Hair Conditioning, Skin Conditioning, Skin Conditioning - Emollient, Viscosity Controlling Safety Ratings: CIR: Safe as used
State
Solid
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.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Viscosity Controlling
Locks In Moisture
Traditional Use
Synthetic derivative combining isoalkyl acids with plant-derived phytosterols, developed in recent decades to combine the emollient benefits of plant sterols with the stability of synthetic compounds.
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
EUrestricted
JAPANrestricted
CANADArestricted
Verified Feb 2026
Data: CosIng · EWG · CIR