Doctor's Best Lutein supplies highly bioavailable carotenoids nutrients lutein and zeaxanthin from Marigold flowers. Lutein and zeaxanthin are the major carotenoids found in the blood, and are highly concentrated in the retina of the eye. Constant exposure to ultra violet (Uv) and blue light emitted from computers and mobile devices may potentially damage to the retinal cell. Lutein and zeaxanthin helps neutralize free radicals to support healthy visual function and macular health.