- Lutein and zeaxanthin are yellow carotenoids found in leafy greens, egg yolks, and corn. They concentrate in the macula of the eye and are also present in brain tissue.
- Macular pigment optical density (MPOD), measured in the eye, is used in research as a rough proxy for lutein and zeaxanthin in the brain.
- In a 12-month trial of 51 older adults (mean age about 74), 10 mg lutein plus 2 mg zeaxanthin daily improved complex attention and cognitive flexibility versus placebo; the study was small and supplements were donated by a manufacturer.
- The AREDS2 formula (10 mg lutein, 2 mg zeaxanthin) is for people with intermediate or late age-related macular degeneration; NEI found no benefit for people with early AMD or no AMD.
- Evidence for cognition is emerging, not established. Eating more leafy greens is a low-risk, food-first way to raise intake.
What lutein and zeaxanthin are
Lutein and zeaxanthin belong to the carotenoid family — the pigments that color many fruits and vegetables. Unlike beta-carotene, they aren't converted into vitamin A. Instead, the body deposits them selectively in the macula, the central part of the retina responsible for sharp vision, where they form the yellow "macular pigment" that filters blue light and acts as an antioxidant.
They're also found in brain tissue, and that's where the brain angle comes from. Because the retina is developmentally an extension of the brain, researchers use macular pigment optical density (MPOD) — a non-invasive eye measurement — as a rough proxy for how much lutein and zeaxanthin are in brain tissue. It's an imperfect proxy, but it lets studies track changes over time.
The key cognitive trial in older adults
The most-cited supplementation trial in older adults was published in Frontiers in Aging Neuroscience in 2017. Researchers at the University of Georgia randomized 62 community-dwelling older adults to 10 mg lutein plus 2 mg zeaxanthin daily or a matching placebo for 12 months; 51 were included in the analysis, with a mean age of about 74.[1]
- Biomarkers: MPOD rose significantly in the supplement group by 12 months; serum lutein and zeaxanthin were higher from month 4 onward.
- Cognition: compared with placebo, the supplement group improved in complex attention and cognitive flexibility. Executive function showed a non-significant trend, and composite memory improved in men only.
Now the caveats, which the authors acknowledged: it was a small trial with a homogeneous, well-educated sample; the placebo group still got lutein and zeaxanthin from food; and the supplements were provided by DSM Nutritional Products, with authors who had received honoraria from Abbott Nutrition.[1] That doesn't invalidate the findings, but it's exactly why one small trial isn't enough to call something proven.
EMERGING: Lutein + zeaxanthin for attention and cognitive flexibility in older adults — small trials, mixed sponsorship.Where AREDS2 fits in
Many people first meet lutein and zeaxanthin through AREDS2, the large National Eye Institute trial that tested eye-vitamin formulas in more than 4,000 people aged 50 to 85 at risk for advanced age-related macular degeneration (AMD).[2] The current AREDS2 formula contains 10 mg lutein and 2 mg zeaxanthin, replacing beta-carotene.[3]
The key points from NEI:[3]
- The formula benefits people with intermediate or late AMD.
- There was no benefit for people with early AMD or without AMD.
- Beta-carotene (in the original AREDS formula) is not recommended for current or former smokers because of lung cancer risk; the lutein/zeaxanthin formula doesn't contain beta-carotene.
AREDS2 also included cognitive testing. NIH's Office of Dietary Supplements reports that in 3,501 older adults with AMD, the omega-3 supplement (350 mg DHA plus 650 mg EPA daily for 5 years) had no significant effect on cognitive function.[4] AREDS2 was designed and powered around eye outcomes, so it isn't a reason to take an eye formula for your brain.
AREDS2-style supplements are designed for a specific eye condition. If you have AMD, your eye doctor will guide you. If you don't, there's no evidence they protect your eyes, and the brain evidence is limited to small trials.
Food vs supplement
Lutein and zeaxanthin are easy to get from food. The richest sources are dark leafy greens — kale, spinach, collards, turnip greens — along with egg yolks, corn, peas, broccoli, and orange peppers. Carotenoids are fat-soluble, so eating them with some fat (olive oil on greens, eggs) helps absorption.
A food-first approach fits naturally with dietary patterns associated with healthier brain aging, which we cover in foods that fight brain aging. A supplement makes more sense if your diet contains few vegetables or your eye doctor recommends one.
| Approach | Pros | Cons |
|---|---|---|
| Leafy greens and eggs | Brings fiber, folate, and other nutrients; fits brain-healthy diet patterns | Intake varies day to day |
| Lutein + zeaxanthin supplement (e.g., 10 mg + 2 mg) | Matches the dose used in the cognitive trial and AREDS2 | Limited brain evidence; adds cost |
| Multivitamin with lutein | Convenient | Often low doses; check the label |
Safety notes
Lutein and zeaxanthin are generally well tolerated at the doses used in trials, and NEI notes they haven't been linked to the increased cancer risk seen with beta-carotene.[3] High intakes can occasionally cause harmless yellowing of the skin (carotenodermia). As with any supplement, tell your doctor what you take, and choose products with third-party testing — a USP or NSF seal means an independent lab confirmed the label contents and screened contaminants, not that the product works. Confirm the seal on the specific listing.
Who it may suit
If you have AMD, follow your eye doctor's guidance on AREDS2. If you're a healthy older adult interested in cognition, start with food — leafy greens several times a week and eggs if they fit your diet. A modest-dose lutein/zeaxanthin supplement is a low-risk experiment if your vegetable intake is poor, but it's not an evidence-based memory treatment. For supplements with deeper cognitive trial bases, see our citicoline research review and DHA vs EPA comparison.
What to actually buy
If you choose a supplement, compare products that state lutein and zeaxanthin amounts separately (the trial used 10 mg + 2 mg). Check each listing for third-party testing.
Lutein 10 mg + zeaxanthin 2 mg
The dose used in the 12-month cognitive trial and the AREDS2 formula. Ask your eye doctor if you have AMD.
Check Amazon price →Nordic Naturals Algae DHA
DHA is the other retina-and-brain nutrient we cover in depth, with its own cognitive-aging trials.
Check Amazon price →Frequently asked questions
Do lutein and zeaxanthin improve memory?
The evidence is early. A 12-month trial of 51 older adults found improvements in complex attention and cognitive flexibility, with memory improving in men only. Larger trials are needed.
What is macular pigment optical density?
MPOD is an eye measurement of lutein and zeaxanthin in the macula. Researchers use it as a rough proxy for levels in the brain.
Should I take AREDS2 vitamins for my brain?
No. AREDS2 is designed for people with intermediate or late age-related macular degeneration. NEI found no benefit for people with early AMD or no AMD, and it hasn't been shown to protect cognition.
What foods are high in lutein and zeaxanthin?
Dark leafy greens such as kale, spinach, and collards, plus egg yolks, corn, peas, broccoli, and orange peppers. Eating them with some fat helps absorption.
Are lutein and zeaxanthin safe?
They're generally well tolerated at trial doses and haven't been linked to the cancer risk seen with beta-carotene. Very high intakes can cause harmless skin yellowing.
Citations
- Hammond BR Jr, Miller LS, Bello MO, et al. Effects of lutein/zeaxanthin supplementation on the cognitive function of community dwelling older adults: a randomized, double-masked, placebo-controlled trial. Front Aging Neurosci. 2017;9:254. https://www.frontiersin.org/articles/10.3389/fnagi.2017.00254/full
- National Eye Institute. NIH study provides clarity on supplements for protection against blinding eye disease. https://www.nei.nih.gov/about/news-and-events/news/nih-study-provides-clarity-supplements-protection-against-blinding-eye-disease
- National Eye Institute. AREDS/AREDS2 Frequently Asked Questions. https://www.nei.nih.gov/research/clinical-trials/age-related-eye-disease-studies-aredsareds2/aredsareds2-frequently-asked-questions
- NIH Office of Dietary Supplements. Omega-3 Fatty Acids — Fact Sheet for Health Professionals. https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/