Each capsule supples crystalline pure lutein in a natural base of spinach concentrate. The lutein in this product is extracted from marigolds and purified by an exclusive patented process. Lutein is the most abundant carotenoid found in fruits and vegetables, and is a potent antioxidant, especially concentrated in the macula of the eye. TwinLab lutein is in a dry, water dispersed form with no added oils or fats.  Natural mixed tocopherols and rosemary extract are added as antioxidants for greater stability and shelf life.