Lutein and zeaxanthin eye supplements: what AREDS2 tested

An AREDS2-style eye supplement is a capsule built around the formula the National Eye Institute tested in a large trial: vitamins C and E, zinc, copper, lutein and zeaxanthin. That trial enrolled older adults who already had signs of age-related macular degeneration (AMD), so the results do not automatically apply to a healthy person buying a "vision" bottle online.

This guide explains what the trials actually gave people, how to compare a sales page to those numbers, and which label lines are worth a second look.

What was the AREDS2 formula, and who was it tested in?

AREDS2 was a randomized, double-masked, placebo-controlled trial that enrolled 4,203 people aged 50 to 85 between 2006 and 2012. According to the PubMed abstract of the JAMA paper, every participant was at risk of progressing to advanced AMD, meaning they had large drusen (yellow deposits under the retina) in both eyes, or large drusen in one eye and advanced AMD in the other.

Participants were randomized to lutein (10 mg) plus zeaxanthin (2 mg), DHA (350 mg) plus EPA (650 mg), both, or placebo. Nearly all of them were also taking the original AREDS formulation, or a variation of it. That original formulation came from an earlier trial, AREDS report no. 8, which used 500 mg of vitamin C, 400 IU of vitamin E, 15 mg of beta carotene, 80 mg of zinc (as zinc oxide) and 2 mg of copper (as cupric oxide) each day.

The National Eye Institute (NEI) summarizes the takeaway on its AMD page: if you have intermediate AMD in one or both eyes, special dietary supplements may be able to stop it from turning into late AMD, and if you have late AMD in only one eye they may slow it in the other eye. Notice the starting point in each sentence. It is a diagnosed condition, found through a dilated eye exam.

What did the trials actually find?

The original AREDS trial followed 3,640 people for an average of 6.3 years. Compared with placebo, the combination of antioxidants plus zinc was associated with a statistically significant reduction in the odds of developing advanced AMD (odds ratio 0.72). Zinc alone and antioxidants alone did not clear the study's strict significance bar in the main analysis. The authors also noted that people with only early signs of disease had a very low 1.3% five-year chance of progression, which is why the formula was aimed at higher-risk groups.

AREDS2 then asked a different question: does adding lutein, zeaxanthin or fish oil to that formula help further? In the main analysis, no. Five-year progression to advanced AMD was 31% for placebo, 29% for lutein plus zeaxanthin, 31% for DHA plus EPA and 30% for both, and none of those differences was statistically significant. The published conclusion says that adding lutein plus zeaxanthin, DHA plus EPA, or both did not further reduce the risk of progression in the primary analyses.

There was a practical finding too. More lung cancers were noted in the group that received beta carotene (2.0%) than in the group that did not (0.9%), mostly in former smokers. The authors concluded that lutein plus zeaxanthin could be an appropriate substitute for beta carotene in the formula. That is why newer "AREDS2" bottles at the pharmacy swap beta carotene for lutein and zeaxanthin.

In plain terms: the trials support a specific, dosed formula for a specific group of older adults. They do not show that any capsule with the word "AREDS2" on the front does the same thing.

How do the AREDS2 doses compare with what a label should show?

The numbers below come from the trial abstracts. Use them as a yardstick, not as a dosing instruction.

A trustworthy label prints an amount next to every one of those names. If it does not, you cannot compare it to anything. Our review method treats a missing amount as a real weakness, because "contains lutein" can mean 10 mg or a dusting.

What does the zinc line tell you?

Zinc is the number to read twice. The original AREDS used 80 mg a day, but the tolerable upper intake level for adults from all sources is 40 mg a day. AREDS2 tested a lower-dose zinc arm and reported no apparent effect of lower zinc on progression to advanced AMD. A high dose used under supervision in a trial is not the same as a high dose taken casually for years. Our Vision 20 review records 50 mg of zinc per capsule, above the 40 mg adult limit, though the label also includes a small dose of copper.

Zinc and copper compete for absorption, so a label that lists zinc without copper is worth a question for a pharmacist. If you take other supplements, add up the zinc from all of them. Our blog has a separate guide to zinc limits.

How do eye-vitamin sales pages compare with the trial?

The best way to see the gap is to look at real offers we have audited, and repeat only what each review says.

• Amounts hidden. The iGenics review notes that the page calls the product an "AREDS2 formula" and names ingredients such as ginkgo, bilberry and saffron, but never states how much of any of the 12 advertised ingredients the capsule contains. It does have a 180-day refund.
• Some ingredients named, no doses. The TheyaVue review found that the page advertises 24 ingredients, names 8, and gives no amount for any of them, although its reference list cites real lutein and AMD research.
• The key ingredients inside a blend. The Crystal Vision review records lutein and zeaxanthin inside a 481 mg proprietary blend with eight other ingredients, so the amounts are unknown.
• Disclosed amounts above the trial. Vision 20 lists lutein at 20 mg and zeaxanthin at 4 mg, double the trial amounts, which our review marks as reasonable next to published eye-health research.

None of these tells you whether a product would help you. They tell you whether the offer gives you enough information to check it against the trials. For a wider look, browse the eye health category or our best eye health picks.

A quick checklist before you buy an eye supplement

1. Do you have a diagnosis? The trials enrolled people at risk of advanced AMD, found on a dilated eye exam. Ask an eye doctor what applies to you.
2. Is there an amount for vitamin C, vitamin E, zinc, copper, lutein and zeaxanthin, each printed separately?
3. Is anything hidden in a "proprietary blend"? If the label lists one combined total, the individual doses are unknown.
4. Does the zinc dose, added to your other supplements, stay under 40 mg a day unless a doctor said otherwise?
5. Does the page say "AREDS2" or "clinically proven" without linking to the actual paper? Open the paper and check who was enrolled.
6. Do you smoke or did you smoke in the past? Beta carotene raised lung cancer counts in former smokers in AREDS2, so ask about it before choosing a formula.
7. Are the refund terms clear? Compare with our ClickBank refund guide.

This article is general information, not medical advice. Talk to an eye doctor or pharmacist before you start a supplement, especially if you take prescription medicine.

FAQ

Do AREDS2 supplements prevent macular degeneration?

No trial showed that. The studies tested whether a formula slowed progression in people already at high risk of advanced AMD. The National Eye Institute describes early AMD as having no treatment, and says supplements are for the intermediate stage or for late AMD in one eye.

Is lutein alone enough for eye health?

In AREDS2, adding lutein plus zeaxanthin to the AREDS formula did not produce a statistically significant further reduction in progression in the primary analysis. The NEI lists leafy green vegetables and fish among the healthy choices for AMD risk.

Why does the original formula contain 80 mg of zinc?

That is the amount the original trial tested, together with 2 mg of copper. It is well above the 40 mg adult upper limit, which is why anyone considering it should do so with an eye doctor's guidance, and why AREDS2 also tested lower zinc doses.

Should smokers avoid beta carotene in eye vitamins?

AREDS2 reported more lung cancers in the beta carotene group, mostly among former smokers, and the Linus Pauling Institute notes that current smokers did not receive beta carotene in that trial. Ask your doctor before choosing any formula that lists it.