Twinlab Lutein (20000 mcg) 60 Caps Lutein is a carotenoid abundant in fruits and vegetables, and is also a potent antioxidant highly concentrated in the macula of the eye (the back part of the retina where entering light hits and sends signals to the brain for sight). Research shows that lutein can serve as your body's own "internal sunglasses," helping to block out visible blue light, the major cause of photic (light induced) damage to the eye.* The problem is, as we age, our supply of lutein dwindles. There are several different sources of lutein, but the most potent form is called Flora Glo Lutein, the only lutein Twinlab uses for all their ocular nutrition supplements. FloraGlo Lutein is a high quality ingredient as it is extracted from marigolds, purified by an exclusive patented process and encapsulated in a dry, water-dispensed form, with no added oils or fats.