Dimethiconol

Dimethiconol is a silicone-based polymer, closely related to Dimethicone but distinct due to its hydroxyl (-OH) groups. First introduced in the 1960s as a hair conditioning agent, it gained prominence in skincare and cosmetic products during the 1990s​​. 

This ingredient is a key component in a variety of products, including creams, lotions, suntan products, bath soaps, lipsticks, shampoos, and hair care products​​. Dimethiconol comes in a wide range of formats, including a variety of viscosities, in anionic emulsions, and even as a gum.

In skincare, Dimethiconol plays vital roles, most notably as an emollient and an antifoaming agent.

1. Emollient. It functions as an emollient, providing skin-conditioning properties that contribute to the softness and smoothness of the skin​​. It features the typical sensorial profile of silicones, with high spreadability and a luxurious, oil-free after feel.
   
   
2. Antifoaming agent. Dimethiconol can also serve as an antifoaming agent, which is useful for oil-in-water emulsions that occasionally exhibit foaming. It reduces the tendency of products to generate foam, ensuring better texture and consistency.

The primary benefit of Dimethiconol in skincare is its emollient properties. It softens the skin, contributing to a smoother, more supple texture. This makes it a popular choice in formulations aimed at improving skin feel​.

The safety of Dimethiconol has been rigorously assessed by the Cosmetic Ingredient Review (CIR) Expert Panel. This panel, which includes experts in dermatology, toxicology, pharmacology, and veterinary medicine, concluded that Dimethiconol and its derivatives are safe for use in cosmetics.

They noted that these ingredients are unlikely to be significantly absorbed into the skin due to their large molecular weights. Additionally, studies indicated that Dimethiconol did not cause mutations, cancer, and was not an irritant or a sensitizer at concentrations used in cosmetics​​.