Lutein

What is lutein?

Lutein is a carotenoid, one of the yellow and orange plant pigments, found in leafy greens such as spinach and kale, in egg yolks and in corn. In the eye it gathers, together with its close relative zeaxanthin, in the macula, the small central part of the retina responsible for sharp detail vision. There the two pigments form what researchers call macular pigment. They absorb high-energy blue light and act as antioxidants, which is why they are often described as an internal filter. Most supplement lutein is extracted from marigold flowers (Tagetes erecta) and is sold either as free lutein or as lutein esters.

What the research says

The strongest evidence comes from the Age-Related Eye Disease Study 2 (AREDS2), a large National Eye Institute trial that enrolled 4,203 people aged 50 to 85 who were already at risk of advanced age-related macular degeneration (AMD). In the primary analysis, adding 10 mg of lutein and 2 mg of zeaxanthin to the original AREDS vitamin and mineral formula did not significantly reduce progression to advanced AMD compared with placebo. Secondary analyses supported swapping beta-carotene for lutein and zeaxanthin, partly because beta-carotene was linked to more lung cancers in former smokers. The result is today’s AREDS 2 formula, which the National Eye Institute recommends for people with intermediate AMD, or late AMD in one eye. The NEI is clear that these supplements do not stop early AMD from progressing and are not meant for people with healthy eyes.

Many smaller randomized trials show that lutein, alone or with zeaxanthin, raises macular pigment optical density, a measurable marker of how much pigment sits in the macula. A 2024 network meta-analysis of randomized trials found that antioxidant supplements, including lutein combinations, increased macular pigment and improved contrast sensitivity at some spatial frequencies, while effects on visual acuity were limited to certain combinations. Whether these changes translate into a noticeable difference in daily life for people with healthy eyes is still uncertain. Evidence that lutein relieves tired eyes after screen use is preliminary.

How it’s used in supplements

Lutein is one of the most common ingredients in eye health supplements, usually paired with zeaxanthin in a ratio of about 5 to 1, which mirrors AREDS2. Doses of 10 mg are typical; some products use 20 mg or more. Because carotenoids are fat-soluble, taking them with a meal that contains some fat may help absorption. Eating more leafy greens remains a sensible food-first way to get lutein.

Lutein is generally well tolerated. High intakes can cause a harmless yellowing of the skin (carotenodermia). People who smoke or used to smoke should note that the AREDS2 researchers moved away from beta-carotene, not lutein, because of lung cancer concerns. Anyone with a diagnosed eye condition should follow their eye doctor’s advice rather than self-treating with supplements.