NOW Clinical Strength Ocu Support has been formulated to provide comprehensive nutritional protection for the eyes. Each serving contains 10 mg of available lutein, a critical pigment of the macula, lens and other ocular tissues. Lutein is a powerful antioxidant related to beta-carotene that protects from harmful free radicals. NOW has also included green tea extract, alpha lipoic acid, grape seed extract and other synergists in this formula to maximize its antioxidant potential.