Lutein vs Zeaxanthin: Two Pigments, One Small Patch of Retina

Explainer · 5 min read

At the center of the retina lies the macula, a spot smaller than a pea that you use for reading faces and small print. It looks yellowish because it stores two plant pigments: lutein and zeaxanthin.

They are close cousins, built from nearly the same chemical pieces, but they are not spread evenly. Zeaxanthin is packed most tightly at the very middle of the macula, and lutein is found more widely around it.

Both pigments absorb some blue light, and both act as antioxidants. That combination is why researchers became interested in whether eating more of them could support the macula over time.

The best-known test was the NIH AREDS2 trial. Volunteers, all with intermediate age-related macular degeneration or advanced disease in one eye, took 10 mg of lutein and 2 mg of zeaxanthin daily as part of a wider formula. The results cannot be applied to healthy eyes, and they came from those particular doses.

Food remains the easiest place to start. Cooked spinach, kale, corn, eggs and orange peppers all contain these pigments, and a little oil or egg yolk on the plate helps the body absorb them.

If you look at a capsule, check whether it names an amount for each pigment. On the Retina Clear label, both sit inside the 351 mg blend with no figures, so you cannot compare them with the 10 mg and 2 mg used in research.

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