What are lutein and zeaxanthin?
Lutein and zeaxanthin are yellow pigments (carotenoids) found in green and yellow vegetables. In the eye, they collect in the macula, the most sensitive part of the retina, where they form the "macular pigment." This pigment filters some of the blue light entering the eye and helps protect retinal cells from free radicals.
Your body cannot make either one, so you can get them only from food or supplements. Macular pigment density tends to decline with age, which is why they are popular eye supplements from your 50s and 60s on.
How lutein and zeaxanthin differ
The two are near-identical "sibling" compounds, but they settle in different parts of the eye.
| Lutein | Zeaxanthin | |
|---|---|---|
| Where in the macula | Mostly in the outer macula | Mostly at the very center (fovea) |
| Rich food sources | Leafy greens such as spinach, kale, broccoli, and lettuce; egg yolks | Corn, bell peppers, goji berries; egg yolks |
| Supplement source | Marigold flower extract | Small amounts in marigold flower extract, or added as a separate ingredient |
| Korea MFDS approved claim | May support eye health by maintaining macular pigment density, which can decline with age | |
Products often list "lutein and zeaxanthin" together because marigold flowers contain both and they work together in the eye. There is no need to buy them separately; a product that contains both is enough.
What lutein claim does Korea's MFDS allow?
Korea's Ministry of Food and Drug Safety (MFDS) recognizes a single claim: "may support eye health by maintaining macular pigment density, which can decline with age." Since 2018, the ingredient has been labeled in Korea as "marigold flower extract" rather than "lutein."
The following phrases, common in ads, are not approved claims:
- "Improves your eyesight": Lutein does not restore vision or change your glasses prescription.
- "Prevents or treats macular degeneration": No disease prevention or treatment claim is approved, and in the research below its effect on its own was unclear.
- "Prevents cataracts and age-related farsightedness": Large studies did not find that it slows cataract progression.
- "Relieves eye strain": Eye fatigue relief is an approved claim for astaxanthin (Haematococcus extract), not lutein.
The evidence for macular degeneration: AREDS2
The study most often cited for lutein is AREDS2, run by the US National Eye Institute (NEI). This large clinical trial followed 4,203 people aged 50–85 at high risk of progression to advanced macular degeneration for about five years. The results:
- Adding 10 mg of lutein and 2 mg of zeaxanthin to the existing formula did not significantly lower the overall risk of progressing to advanced macular degeneration any further (JAMA, 2013).
- However, risk tended to fall among people who ate the least lutein in their usual diet.
- Replacing the beta-carotene in the original formula with lutein and zeaxanthin was found to be safer and just as effective or better, because beta-carotene can raise lung cancer risk in current and former smokers.
- In the 10-year follow-up (JAMA Ophthalmology, 2022), the lutein/zeaxanthin group had about a 20% lower risk of progressing to advanced macular degeneration than the beta-carotene group, and lung cancer risk among former smokers rose markedly only in the beta-carotene group.
A 2023 Cochrane systematic review also concluded that the risk of progression to advanced macular degeneration in people taking lutein and zeaxanthin was about the same as, or slightly lower than, in people not taking them, and rated the certainty of evidence as low.
In short, the evidence for lutein is strongest when someone already diagnosed with macular degeneration takes it as part of the AREDS2 formula on an eye doctor's advice. Whether it prevents macular degeneration in people with healthy eyes is still uncertain.
How much lutein per day?
- Marigold flower extract (typical lutein products): Korea's MFDS standard is 10–20 mg of lutein a day.
- Combined lutein-zeaxanthin ingredients: Standards differ by ingredient. For example, one ingredient approved in 2024 is set at "12 mg a day of lutein and zeaxanthin combined." Follow the daily dose on the label.
- AREDS2 formula: 10 mg of lutein + 2 mg of zeaxanthin.
Taking more does not make it work better. If you combine several eye supplements, you can easily go over 20 mg a day, so check whether your multivitamin or other eye supplements already contain lutein.
When to take lutein for the best absorption
Lutein and zeaxanthin are fat-soluble, so they absorb better right after a meal that contains some fat than on an empty stomach. Breakfast, lunch, or dinner is fine; simply pair it with your most substantial meal. Omega-3 is also fat-soluble, so you can take them after the same meal.
If you take several supplements, select lutein in the supplement schedule to organize it alongside the others.
Side effects and a caution for smokers
Lutein is relatively safe within the recommended amount, but Korea's MFDS requires several cautions:
- Smokers should consult a professional first: The MFDS added this warning after re-evaluating functional ingredients in 2020, because a Korean cohort analysis reported a link between lutein intake and higher lung cancer risk in smokers. If you currently smoke, talk to your doctor or pharmacist before taking it.
- Infants, children, and pregnant or breastfeeding women should avoid it, according to the same labeling rules.
- Your skin may turn yellowish: Large amounts over a long time can tint the palms yellow; this usually fades when you cut back.
- Taking it with beta-carotene: Carotenoids can compete for absorption, and some products carry a note that lutein may reduce beta-carotene absorption.
Getting lutein and zeaxanthin from food
Lutein is especially plentiful in dark leafy greens such as spinach, kale, and chard, and is also found in broccoli, zucchini, and peas. Zeaxanthin is abundant in corn, orange bell peppers, and goji berries. Egg yolks contain smaller amounts, but because they come packaged with fat, they are a well-absorbed source. Lightly sautéing vegetables in oil or dressing them with a little oil also boosts absorption.
Lutein, zeaxanthin, and astaxanthin compared
All three are sold as "eye supplements," but their approved claims in Korea differ. Choose according to your goal.
| Ingredient | Labeled as (Korea) | MFDS approved claim | Daily amount |
|---|---|---|---|
| Lutein | Marigold flower extract | Maintains macular pigment density | 10–20 mg lutein |
| Zeaxanthin | Contained in marigold flower extract and others | Maintains macular pigment density (with lutein) | As labeled |
| Astaxanthin | Haematococcus extract | Helps reduce eye fatigue | 4–12 mg astaxanthin |
If you are concerned about macular pigment declining with age, look at lutein and zeaxanthin; if your eyes feel dry and tired from long hours at a screen, look at astaxanthin. Whether you can take both together is covered in our astaxanthin article.
When to see an eye doctor first
- Straight lines look wavy, or there is a dark spot in the center of what you are looking at (possible macular degeneration)
- Your vision drops suddenly, or one eye becomes blurry
- You suddenly see many floaters or flashes of light
Supplements cannot fix these symptoms; see an eye doctor promptly. After 50, a dilated eye (fundus) exam every 1–2 years is recommended even without symptoms.
The bottom line
Lutein and zeaxanthin make up the macular pigment, and Korea's MFDS recognizes their claim to "maintain macular pigment density that declines with age." In large studies, the clearest evidence came from people who already had macular degeneration taking them as part of the AREDS2 formula; on their own, they have not been shown to improve eyesight or prevent cataracts. If you take them, take 10–20 mg a day right after a meal with some fat, and if you smoke, always talk to a professional first.
Please keep in mind
- This article is based on information checked as of the date shown at the top. New research or changes in official guidelines may change the details, so please use it as a reference rather than taking it as definitive.
- For an accurate diagnosis and advice about your health, please see a doctor in person.