Nature's Plus presents unrivaled nutritional support for healthy eye function. In Ultra Lutein, active ingredients lutein and zeaxanthin combine to form an antioxidant powerhouse that helps to reinforce ocular well-being. While lutein is found in many common foods, most adults may not get sufficient quantities of this beneficial nutrient for their daily diet. Scientific studies indicate that 20 mg of lutein is critical threshold of efficacy for adults who need maximum support for healthy eye function. The cofactor in Ultra Lutein, zeaxanthin, also a marigold derivative, synergistically enhances lutein's natural antioxidant strength.