Which ingredient is commonly used in face powder?

Talc is commonly used in face powder due to its excellent absorptive properties and ability to provide a smooth texture. It helps to absorb excess moisture and oil from the skin, making it a popular choice for setting makeup and creating a matte finish. Additionally, talc can help to soften the appearance of fine lines and imperfections, contributing to a more polished look. This mineral is finely milled to create a lightweight powder that glides on easily, enhancing the wear and comfort of cosmetics applied over it.

In contrast, the other ingredients listed have different uses and properties. Gluten is a protein found in wheat and is not typically used in face powders. Glycerin is a humectant that draws moisture to the skin, more commonly found in hydrating products. Cocoa butter, a rich emollient, is generally used in formulations meant to provide moisture and nourishment rather than in powders intended to absorb oil and provide a matte effect.