Dimethiconol Isostearate

Dimethiconol Isostearate 1
AKA: Silicone-Isostearate Complex
Plant-Derived
Emollient
Skin Conditioner
Silicone
Not Clean
Silicones and siloxanes, dimethyl, 12-hydroxy-1-oxoisooctadexcyloxy-terminated
CAS #
133448-14-3
Form
Liquid
Functions
Skin 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.
Locks In Moisture
Traditional Use
A synthetic compound developed in the 20th century combining silicone with isostearic acid, a branched fatty acid. Created to improve conditioning, emolliency, and spreadability in contemporary skincare and haircare.
EWG
4
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
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
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.
Verified Jun 2026
Data: CosIng · EWG · CIR