The Expert Panel for Cosmetic Ingredient Safety concluded that the following 30 dimethicone, methicone, and substituted-methicone polymers are safe in cosmetics in the present practices of use and concentration described in this safety assessment when formulated to be non-irritating, with the exception that the available data are insufficient to make a determination of safety for use of these ingredients in products that may be incidentally inhaled when applied using airbrush devices: Methicone
Formula
C5H11OSi
Mol. Weight
115.23
CAS #
9004-73-3
See origin →
Functions
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Reduces Static
Conditions Skin
Softens & Smooths
Reduces Flyaways
Traditional Use
Developed as a silicone-based polymer in the mid-20th century. Introduced to cosmetics in the 1950s-1960s as a skin protectant and water-repellent agent.