Although no specific doses of lutein have been determined to be effective for treating disorders as of 2015, United Healthcare Services states that up to 20 milligrams daily for up to nine weeks is likely safe for adults. No safe or effective dosage has been established for children.
Scientific studies have examined adult dosages for certain eye conditions, states WebMD. Studies used at least 6 milligrams of lutein each day to lower participants' risk of age-related macular degeneration, or AMD, and cataracts. Dosages were obtained either through food or supplements. Participants who took in 6.9 to 11.7 milligrams daily through their diets reduced their risk levels the most. Research participants who already had AMD showed relief of symptoms when taking lutein supplements of 10 milligrams each day.