Dietary Supplement Based on Vegetable Oils and Carotenes, in Capsules. With natural carotenoids, a source of vitamin A. This Dietary Supplement Based on Vegetable Oils and Carotenes, in capsules, provides alpha and beta carotenes, lutein, and zeaxanthin. Alpha and beta carotenes are precursors to vitamin A and act as nutrients in the body. Free of artificial colors, flavors, and preservatives.