Cycloheptasiloxane
AKA “Cyclomethicone 7, Cycloheptasiloxane, Tetradecamethylcyclotetradecaneheptasiloxane, J182.220I, tetradecamethyl cycloheptasiloxane”
Synthetic
Ingredient Facts
Cycloheptasiloxane
AKA: Cyclomethicone 7, Tetradecamethylcyclotetradecaneheptasiloxane, J182.220I, Tetradecamethyl cycloheptasiloxane
Synthetic · Emollient · EWG: 4
Synthetic
Emollient
Solvent
Skin Conditioner
Silicone
Synthetic
Clean
A lightweight silicone that glides smoothly on skin, helping powders stay evenly applied without clumping while keeping skin soft and comfortable.
Formula
C14H42O7Si7
Mol. Weight
519.07
CAS #
107-50-6
Form
Liquid
See origin →
Functions
Anticaking
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Locks In Moisture
Traditional Use
A cyclic silicone polymer synthesized in the mid-20th century. Developed for use in cosmetics as a volatile carrier and spreading agent, allowing for lightweight texture in skincare and haircare products.
Skin Types
●all-skin-types
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
EWG
4
CIR
Safe w/Qualifications
Pregnancy
Yes
Restricted By
CIR Safety Findings
medical-approval
all-shades-safe
Regulatory Agencies
Safety assessment of Cyclomethicone, Cyclotetrasiloxane, Cyclopentasiloxane, Cyclohexasiloxane and Cycloheptasiloxane
Cosmetic Ingredient Review (CIR) Expert Panel
International Journal of Toxicology
Cycloheptasiloxane
European Commission
EU Cosmetic Ingredient Database (CosIng)
Cycloheptasiloxane
Environmental Working Group (EWG)
EWG Skin Deep Cosmetics Database
Safety assessment of cyclomethicone, cyclotetrasiloxane, cyclopentasiloxane, cyclohexasiloxane, and cycloheptasiloxane.
Johnson W Jr, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2011
Safety assessment of cyclomethicone, cyclotetrasiloxane, cyclopentasiloxane, cyclohexasiloxane, and cycloheptasiloxane.
Johnson W Jr, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2011
Safety assessment of cyclomethicone, cyclotetrasiloxane, cyclopentasiloxane, cyclohexasiloxane, and cycloheptasiloxane.
Johnson W Jr, Bergfeld WF, Belsito DV, Hill RA, Klaassen CD et al.
International journal of toxicology, 2011
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR