Lutein is a carotenoid, found in dark green leafy vegetables such as spinach, so it is present in our daily diet, but it is necessary to take 6-10 mg per day of lutein to notice its health benefits according to research. Lutein as other carotenoids are found in blood and tissues, provides antioxidant properties, protection from blue light absorption and it reduces the skin´s sensibility  against UV light damages. But  lutein is also and selectively accumulated in the macula of human retina, and filters potentially phototoxic blue light and near-ultraviolet radiation. Presence of lutein has been associated with healthy vision.