To Promote & Maintain Healthy Vision. Gluten Sugar and Preservative Free. Lutein and zeaxanthin are carotenoids supplied by fruits and vegetables which are important to vision. They eye contains concentrated amounts of lutein and small amounts of zeaxanthin in and around the macula. Carlson provides lutein with naturally occurring zeaxanthin extracted from marigold flowers in easy-to-swallow soft gels. Vitamin E has been added to protect freshness.