AREDS 2 is a specific combination of vitamins and minerals shown to reduce the risk of worsening age-related macular degeneration (AMD) by about 25 percent. The formula comes from a major clinical trial run by the National Eye Institute, and supplements labeled “AREDS 2” are designed to match the exact doses tested in that trial. It’s not a prescription drug. You can buy it over the counter, but it’s intended for people who already have a specific stage of AMD, not as a general eye health supplement.
What’s in the AREDS 2 Formula
The supplement contains six ingredients at fixed doses, typically delivered in two softgels per day:
- Vitamin C: 500 mg
- Vitamin E: 180 mg
- Zinc: 80 mg
- Copper: 2 mg
- Lutein: 10 mg
- Zeaxanthin: 2 mg
The copper is included specifically to prevent a deficiency. Long-term zinc intake at these levels can interfere with copper absorption, and copper deficiency has been documented at supplemental zinc doses as low as 50 mg per day over several weeks. So the 2 mg of copper acts as a safety measure, not a treatment ingredient.
How It Differs From the Original AREDS
The original AREDS formula, tested in the late 1990s, contained beta-carotene instead of lutein and zeaxanthin. During that first trial, two separate studies found that beta-carotene significantly increased the risk of lung cancer in smokers. Participants assigned to beta-carotene had roughly double the risk of lung cancer, with most cases occurring in former smokers.
The AREDS 2 trial, which began in 2006, tested whether swapping beta-carotene for lutein and zeaxanthin would maintain the same protective effect against AMD progression. It did. The updated formula worked just as well, without the lung cancer risk. Based on those results, beta-carotene was permanently dropped, and the revised formula became the standard. The American Academy of Ophthalmology has reaffirmed the AREDS 2 version as the recommended supplement for eligible patients with AMD.
How Lutein and Zeaxanthin Protect Your Eyes
Lutein and zeaxanthin are carotenoid pigments that naturally concentrate in the macula, the small central area of your retina responsible for sharp, detailed vision. Together they form what’s called macular pigment, and they do two things. First, they act as a physical filter for blue light, absorbing high-energy wavelengths before they reach the light-sensitive cells underneath. Second, they function as antioxidants, neutralizing reactive oxygen species that would otherwise damage the fatty membranes of retinal cells.
The macula is especially vulnerable to oxidative stress because it has a high concentration of polyunsaturated fatty acids and is constantly exposed to light. Over time, this combination generates damaging molecules that contribute to the breakdown seen in AMD. By quenching those molecules and reducing a waste product called lipofuscin, lutein and zeaxanthin help slow the cycle of damage. The vitamins C and E in the formula support this antioxidant effort, while zinc plays a role in retinal cell function and immune defense in eye tissue.
Who Should Take It
AREDS 2 supplements are recommended for a specific window of AMD progression. If you have intermediate AMD in one or both eyes, the supplement can slow vision loss and may prevent the disease from advancing to late-stage AMD. If you have late AMD in only one eye, AREDS 2 may help protect the other eye from progressing.
Outside that window, the evidence doesn’t support taking it. AREDS 2 supplements cannot prevent early AMD from developing into intermediate AMD, and they won’t meaningfully help if you already have late AMD in both eyes. There’s also no evidence that taking the formula prevents AMD from developing in healthy eyes in the first place. This is important because many people assume a supplement labeled for “eye health” is worth taking as a preventive measure. For AREDS 2, the benefit is narrow but meaningful: it targets the intermediate stage specifically.
Your eye doctor can tell you what stage you’re in based on a dilated eye exam. AMD stages are determined by the size and number of deposits under the retina (called drusen) and whether any vision-threatening changes like abnormal blood vessel growth have started.
The Zinc Dose Debate
The 80 mg zinc dose is the most debated part of the formula. The original AREDS trial used 80 mg based on an earlier study suggesting it was effective, but there was already evidence that the body maxes out on zinc absorption at closer to 25 mg. The AREDS 2 trial tested both doses head to head.
The result: lowering zinc from 80 mg to 25 mg had no statistically significant effect on AMD progression. The two doses performed similarly. Despite this, most commercial AREDS 2 supplements still use the 80 mg dose, and the researchers concluded there wasn’t enough evidence to make a firm clinical recommendation to switch. Some brands now offer lower-zinc versions, which may be worth discussing with your eye doctor, especially if you experience side effects.
Side Effects to Expect
The most common complaints come from the high zinc content. At doses between 50 and 150 mg per day, zinc can cause nausea, a metallic taste, abdominal discomfort, and diarrhea. These symptoms are usually mild but can be persistent enough that some people stop taking the supplement.
The more serious concern with long-term high-dose zinc is copper depletion, which is why AREDS 2 includes copper in the formula. Signs of copper deficiency include fatigue, weakness, and in severe cases, neurological problems. As long as you’re taking the complete AREDS 2 formula (not just a standalone zinc supplement), the added copper is designed to offset this risk. If you take other supplements or multivitamins that also contain zinc, it’s worth adding up your total daily intake to make sure you’re not stacking doses beyond what your body can handle comfortably.
Choosing a Supplement
Dozens of brands sell AREDS 2 supplements, and the key is matching the exact doses from the clinical trial. Look at the Supplement Facts panel and confirm it lists 500 mg vitamin C, 180 mg vitamin E, 80 mg zinc (or 25 mg if you’re choosing a lower-zinc version), 2 mg copper, 10 mg lutein, and 2 mg zeaxanthin. Some products add extra ingredients like omega-3 fatty acids, B vitamins, or other carotenoids. The AREDS 2 trial did test omega-3 supplementation and found it did not reduce AMD progression, so those additions aren’t supported by the same evidence.
Because these are sold as dietary supplements rather than drugs, they aren’t subject to the same manufacturing oversight as prescription medications. Sticking with well-known brands that reference the AREDS 2 study on their label and use the tested doses is the most reliable approach.