A humectant is a substance that helps retain moisture in various products, such as cosmetics, food, and pharmaceuticals. By attracting water from the air or deeper layers of the skin, humectants keep items hydrated and prevent them from drying out. Common examples include glycerin, hyaluronic acid, and sorbitol. In skincare, humectants are often used in moisturizers to enhance hydration. They work by drawing moisture into the skin, making it feel plump and smooth. This property is essential for maintaining healthy skin and is a key ingredient in many beauty products, including lotions and serums.