Lutein is taken by mouth. The amount taken depends on the health problem being prevented. Lutein is used to prevent eye cataracts and macular degeneration (AMD), especially those related to age. You need to take 6mg of lutein per day to reduce the risk of cataracts. This is attained using a lutein supplement or a lutein-rich diet. 10mg of lutein per day are needed to reduce symptoms of AMD. Most lutein supplements do not contain the amount of the carotenoid vitamin you need to take daily. If you are using a supplement with low levels of the vitamin, you may have to take care of the deficit by eating a suitable diet. Kale, spinach and broccoli are the best sources of lutein. A cup of each of these foods, when cooked, can help you get the recommended amount of the vitamin per day. So, maintain healthy eyes by taking lutein-rich supplements and diets.