Hydrogen dimethicone
AKA: Dimethicone Copolymer, Cyclopentasiloxane Copolymer, Silicone Fluid
Synthetic
Occlusive
Silicone
Clean
Hydrogen Dimethicone is a derivative of Dimethicone where some of the methyl groups have been replaced with a hydrogen atom
CAS #
68037-59-2, 69013-23-6, 70900-21-9
Form
Liquid
Functions
Film Forming
Creates a physical seal on skin to lock moisture in and keep irritants out. The "slugging" ingredient — barrier protection.
Creates Protective Barrier
Brightens Skin
Antioxidant Protection
Reduces Inflammation
Traditional Use
Developed in the mid-20th century as a silicone polymer derivative. Used in cosmetics since the 1970s as an emollient and conditioning agent for skin and hair.
EWG
2
CIR
Safe
Pregnancy
Yes
Restricted By
CIR Safety Findings
ewg-2
pregnancy-nursing-safe
all-shades-safe
Regulatory Agencies
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
The paper trail
🔬Peer-reviewed1 paper →
⚖️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