What ingredient is commonly found in primers for smooth makeup application?

Silicone is a key ingredient commonly found in primers designed for smooth makeup application. It functions primarily by creating a silky, smooth texture on the skin that helps to fill in fine lines and pores, resulting in a more even surface for foundation and other makeup products. The unique properties of silicone allow it to form a barrier on the skin, which not only provides that desired smooth finish but also aids in the longevity of makeup by helping it adhere better throughout the day.

While glycerin is a humectant that attracts moisture to the skin, it does not provide the same smoothing effect. Hyaluronic acid is also a hydrating ingredient beneficial for skin plumpness but not specifically known for priming purposes. Retinol, commonly used for its anti-aging properties, can be too potent for use in makeup primers and is not focused on providing a smooth base. Thus, silicone stands out as the most effective ingredient for preparing the skin for makeup application.