Natural Factors Lutein is a natural antioxidant for eye health. Natural Factors Lutein provides 40 mg of natural Lutein in a highly absorbable form derived from FloraGlo Lutein (derived from marigold flowers) and is purified according to a patented process. Lutein is a yellow-orange carotene that research has shown to offer powerful support to help the body protect the eyes lungs and arteries from free radical damage.