Lutein and Zeaxanthin: Benefits, Dosage, and Safety

What lutein and zeaxanthin is

Lutein and zeaxanthin are two yellow-orange plant pigments in the xanthophyll subclass of carotenoids. Unlike beta-carotene, alpha-carotene, and beta-cryptoxanthin, they are non-provitamin A carotenoids, meaning the body does not convert them into vitamin A. Humans cannot synthesize them, so they must be obtained from diet or supplements. They are the main carotenoids that selectively accumulate in the macula of the retina, where together with meso-zeaxanthin (formed in the eye from lutein) they make up the macular pigment. The NIH Office of Dietary Supplements discusses lutein and zeaxanthin within its Vitamin A and Carotenoids fact sheet rather than in a separate fact sheet, and the Food and Nutrition Board has not set Dietary Reference Intakes for them.

What it does

• Accumulate in the central retina (macula) where they form the macular pigment
• Act as antioxidants that help defend retinal tissue against oxidative stress
• Filter high-energy blue light reaching the retina
• Are carotenoids that, unlike provitamin A carotenoids, are not converted to vitamin A and may have other activities not involving vitamin A formation

Intake and dosing

Lutein and Zeaxanthin is not an essential nutrient, so no Recommended Dietary Allowance or Tolerable Upper Intake Level has been set. Doses in studies vary widely. Because supplement doses are not standardised, discuss an appropriate amount with a clinician or pharmacist.

Deficiency and who is at risk

No clinical deficiency disease has been defined for lutein or zeaxanthin because they are not classified as essential nutrients and have no Dietary Reference Intake. Low dietary intake is associated with lower macular pigment density, and observational data link low intakes with higher risk of age-related macular degeneration, but a specific deficiency syndrome is not established. Typical U.S. intake is only about 1 to 2 mg per day of lutein and zeaxanthin combined.

Who may need more

• People with intermediate age-related macular degeneration, or advanced AMD in one eye, who use an AREDS2-type formulation under medical guidance
• People with low dietary intake of lutein and zeaxanthin who took an AREDS supplement containing them saw a 26% lower risk of advanced AMD in AREDS2
• People who eat few green leafy vegetables or eggs

Food sources

Dark green leafy vegetables are the richest common sources, including kale, spinach, broccoli, peas, and lettuce. Other sources include yellow corn and corn products, egg yolk (a bioavailable source), and orange- and yellow-colored vegetables and fruits. Goji berries contain the highest known food levels of zeaxanthin. Typical U.S. dietary intake is roughly 1 to 2 mg per day of lutein and zeaxanthin combined.

Forms and absorption

Supplements typically supply free (non-esterified) lutein and zeaxanthin, often derived from marigold (Tagetes) flowers, and some products add meso-zeaxanthin. The AREDS2 clinical trial formulation used 10 mg lutein plus 2 mg zeaxanthin daily, a 5-to-1 ratio, in combination with vitamin C, vitamin E, zinc, and copper. Absorption is improved when taken with dietary fat. From foods, egg yolk is considered a highly bioavailable source because of its fat content. The FDA classifies lutein as Generally Recognized as Safe (GRAS).

Safety, excess and interactions

Too much

No Tolerable Upper Intake Level has been set. The Food and Nutrition Board has not established ULs for carotenoids. Lutein and zeaxanthin appear to be safe regardless of smoking status. The main reported effect of high or prolonged carotenoid intake is carotenodermia, a harmless yellow-orange discoloration of the skin; in the AREDS2 trial, minor skin yellowing was the only notable effect at 10 mg lutein per day over 5 years. Unlike beta-carotene, lutein and zeaxanthin have not been linked to increased lung cancer risk in smokers.

Interactions to know

• ODS and NCCIH do not report well-established, specific drug interactions for lutein or zeaxanthin themselves.
• Beta-carotene and other carotenoids can compete with lutein and zeaxanthin for intestinal absorption, so high-dose beta-carotene may lower their uptake.
• Combination AREDS2-type supplements contain large amounts of certain vitamins and minerals (such as zinc, copper, vitamin C, and vitamin E) that, per NCCIH, may affect food digestion and could change drug metabolism; discuss with a clinician.
• Absorption of lutein and zeaxanthin depends on dietary fat, so fat-blocking weight-loss agents or very low-fat intake can reduce absorption.

How status is measured

Not routinely measured in clinical practice. Lutein and zeaxanthin can be measured as carotenoid levels in plasma or serum, and their accumulation in the retina is quantified non-invasively as macular pigment optical density (MPOD), a research and eye-health marker rather than a standard clinical test.

Regulated as dietary supplement ingredients under DSHEA, not as drugs; supplements cannot claim to treat, cure, or prevent disease. Lutein is classified by the FDA as Generally Recognized as Safe (GRAS). No Dietary Reference Intake (RDA, AI, or UL) has been established by the Food and Nutrition Board.

What the evidence supports

We grade the strength of evidence behind each common reason people take lutein and zeaxanthin, mirroring how the NIH describes it.