Premium Quality Visual Function Certified Potency Dietary Supplement FloraGlo Lutein Gluten Free Health through the power of nature, that's what it means to Trust the Leaf. Lutein is an essential carotenoid found in the macular section of the retina. Lutein helps protect the retina from harmful ultraviolet (UV) light and free radicals. Our Lutein is carefully tested and produced to superior quality standards.