Cyclomethicone

Cyclomethicone is a group of cyclic siloxane compounds. The most common types are cyclotetrasiloxane, cyclopentasiloxane, and cyclohexasiloxane. These are clear, odorless, colorless liquids with a low viscosity and a smooth, silky feel.

In personal care products, cyclomethicones are widely used as emollients and conditioners. They spread easily on the skin and hair, providing a light, non-greasy feel. They can help to improve the texture of creams, lotions, and hair care products, making them feel smoother and more luxurious. Their volatility means they evaporate quickly, leaving behind other beneficial ingredients without a heavy or sticky residue. This property also makes them useful in antiperspirants and deodorants, allowing for a smooth application and quick drying.

Cyclomethicones are also employed in cosmetics, such as foundations and primers, to improve spreadability and create a smooth finish. In hair care, they can add shine and reduce frizz. Due to their inert nature, they are generally considered safe for topical use and are not known to be comedogenic or irritant for most individuals. While they are often used interchangeably with linear silicones, their cyclic structure gives them unique evaporative properties.