Natural Factors Lutein - 20 mg - Bonus Size - Lutein and zeaxanthin are carotenoid antioxidants that are concentrated in the eyes, where they protect the lens and retina from damage caused by free radicals and exposure to sunlight. Natural Factors uses LuteinRich naturally sourced, pure, high-potency lutein and zeaxanthin derived from marigold petals. Research shows that taking a quality lutein supplement every day can increase optical pigment levels in the retina and prevent or slow the progression of age-related macular degeneration, and cataracts. Lutein also improves visual acuity, glare recovery, and night vision in people with degenerative eye conditions. Natural Factors Lutein is ideal for anyone experiencing or wanting to prevent degenerative vision loss.