Dietary Supplement Supports Eye Health Source Naturals Full Spectrum Carotene, from dunaliella salina algae, helps support eye health. It is an excellent source of pro-vitamin A, providing 500% DV as a blend of cis- and trans-beta-carotene, which is converted in the body to the active form of vitamin A as needed. The broad spectrum of carotenoids in Full Spectrum Carotene act as antioxidants. Vitamin A is an essential nutrient required for healthy skin, eyes, mucous membranes, cell growth and immune defense.