ZO Skin Health's Retinol Skin Brightener works by combining high-potency retinol and other ingredients to accelerate cell turnover, breaking up existing pigmentation and fading dark spots for a brighter, more even skin tone. It also includes ingredients that prevent the formation of new discoloration and provide antioxidant protection. The specially formulated product delivers retinol in a controlled way for maximized brightening, leading to improved skin smoothness and radiance over time.