Stearoxymethicone/Dimethicone Copolymer

Stearoxymethicone/Dimethicone Copolymer molecular structure
molecular structure · PubChem
AKA: Silicone polymer, Stearyl silicone copolymer
Plant-Derived
Emollient
Skin Conditioner
Silicone
Clean
OriginDerived from silicone polymers, a synthetic compound created by combining dimethicone with stearoxy and methyl functional groups. Synthesized through hydrosilylation reactions that bond silicone backbones with organic alkyl chains.
Silicones and siloxanes, dimethyl, octadecyloxy methyl, trimethylsilyl terminated
Form
Liquid
Skin Types
●all-skin-types
Best For
Dryness
Pregnancy & Breastfeeding Safe
Yes
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.
Viscosity Controlling
Locks In Moisture
The paper trail
🔬Peer-reviewednone on file
⚖️Regulatory1 listing →
🛡️Safety-assessed3 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
2
CIR
Safe as used
Pregnancy
Yes
Concentration Guide
Leave-on0.2–2%
Rinse-offNot reported
0%50%100%
CIR reported use · 2014 survey
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR