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Carotenoids

Carotenoids that contain unsubstituted beta-ionone rings (including beta-carotene, alpha-carotene, beta-cryptoxanthin and gamma-carotene) have vitamin A activity (meaning that they can be converted into retinol). 
Carotenoids can also act as antioxidants. Lutein, meso-zeaxanthin, and zeaxanthin are present in retina as macular pigments whose importance in visual function remains have been approved clinical research.