Zeaxanthin and lutein, two well-known carotenoids, are found in high levels in the macula, and work synergistically to fight free radical damage that can cause eye diseases such as age-related macular degeneration (AMD). A review of their benefits in Articlesbase noted the two carotenoids work cooperatively in the eye, as zeaxanthin can repair and protect the cones while lutein supports the health of the rods.
Common food sources of zeaxanthin include corn, pepper and saffron, while green leafy vegetables are a plentiful source of both carotenoids. While eating a healthy diet can supply adequate levels of the carotenoids, it can take concerted effort to build up internal reserves; further, many adults don’t come close to consuming a healthy diet. Therefore, the use of dietary supplements containing lutein and zeaxanthin may be advisable in some cases to reach the recommended intake of 24 mg/d of each carotenoid.