Zeaxanthin is one of the most common carotenoid bioactives found in nature. Synthesized in plants and some micro-organisms, it is the pigment that gives paprika (made from bell peppers), corn, saffron, wolfberries, and many other plants and microbes their characteristic colour.
Zeaxanthin also resides in the human macula lutea (yellow spot of the eye) and research has suggested that it may reduce the risk for age-related macular degeneration and cataract. It is believed that this carotenoid has a similar chemical structure found in retina pigments. Since the eye is closely connected to the brain, it is raised that zeaxanthin could even benefit the brain.