What are free radicals?

Free radicals are unstable molecules, searching for other, healthy molecules to pair with and turn into an unstable molecule. Free radicals exist both within and outside the body, but exposure to external sources, such as UV rays and pollution, can cause an excess of unhealthy molecules which oxidize the skin cells, causing effects such as aging, pigmentation and dullness. Antioxidants can help protect your skin from free radical damage.