Supplement analysis backed by scientific evidence · PT

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Moderate evidenceEye health

Lutein & Zeaxanthin

Lutein and zeaxanthin are the macular pigments, and in AREDS2 they were a safe and effective replacement for beta-carotene in the formula for slowing advanced age-related macular degeneration. They do not prevent AMD in healthy eyes and they do not prevent cataract.

What the science says

  • Slows progression to advanced AMD when substituted for beta-carotene Moderate evidence

    AREDS2 randomized 4,203 people at high risk of advanced AMD and found no significant benefit of adding lutein 10 mg + zeaxanthin 2 mg to the base formula in the primary analysis (HR 0.90, 95% CI 0.76-1.07). However, in the direct comparison of lutein/zeaxanthin against beta-carotene, lutein/zeaxanthin reduced progression by about 18%, and in participants in the lowest quintile of dietary lutein intake the benefit was larger.

  • Does not prevent cataract Strong evidence

    AREDS2 report no. 4 analysed cataract surgery and progression in the same cohort and found no significant effect of lutein/zeaxanthin on cataract development overall (HR 0.96, 95% CI 0.84-1.10). A subgroup with the lowest dietary lutein intake showed a possible reduction, but this was exploratory.

  • Increases macular pigment optical density Strong evidence

    Supplementation reliably raises macular pigment optical density in a dose-dependent manner over 3-12 months, which is the mechanistic basis for the eye claims. Raising the pigment is well established; translating that into better vision or lower disease risk in healthy eyes is not.

  • Improves cognition or visual performance in healthy people Limited evidence

    Randomized trials of lutein and zeaxanthin, often combined with DHA, report small improvements in episodic memory or contrast sensitivity in older adults, but samples are small, endpoints are numerous, and results are inconsistent across trials. Do not buy this for cognition.

Dosage & safety

Studied doseAREDS2 used lutein 10 mg + zeaxanthin 2 mg daily. Macular pigment trials use 6-20 mg/day lutein. Take with a fat-containing meal; carotenoid absorption is poor without dietary fat. Effects on macular pigment take 3-6 months to plateau.
SafetyVery safe at typical doses; no serious adverse events in the five-year AREDS2 trial. High intakes can cause carotenoderma, a harmless yellowing of the skin. Critically, smokers and recent ex-smokers must avoid beta-carotene-containing eye formulas — beta-carotene increased lung cancer risk in CARET and ATBC, which is precisely why AREDS2 substituted lutein/zeaxanthin. Lutein and zeaxanthin themselves carry no such signal. May compete with beta-carotene for absorption. Supplementation is not a substitute for ophthalmological care, and there is no reason to take it for prevention if you do not have intermediate or advanced AMD.

Scientific references

Where to buy

NOW Foods, Lutein & Zeaxanthin, 60 Softgels

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