NOW Foods' Lutein, the active carotenoid in this potent, is a natural source antioxidant. It is naturally derived from marigold flowers and contains a normal blend of carotenoids, including Zeaxanthin and Cryptoxanthin. Lutein is a plant pigment that is necessary to maintain the health of the macula, an area of the eye responsible for central and high acuity vision. Scientific studies have shown that Lutein may also serve to protect skin from the damage induced by UV light.