An antioxidant is a substance that helps protect cells in the body

Antioxidants are also used in cosmetics for their ability to protect the skin from free radical damage. Free radicals can be generated in the skin as a result of exposure to environmental stressors such as:

UV radiation, pollution, and cigarette smoke. When free radicals damage the skin, they can contribute to premature aging, wrinkles, and skin cancer.

Examples of antioxidants are retinol and niacinamide.