Several vitamins and nutrients have solid evidence behind them for protecting eyesight, but the strongest research points to a specific combination: vitamin C, vitamin E, zinc, lutein, and zeaxanthin. These are the ingredients in the AREDS2 formula, a supplement regimen backed by over 30 years of clinical trials showing it can slow vision loss from age-related macular degeneration (AMD) by 25 to 35%. Vitamin A also plays a foundational role in how your eyes function, particularly in low light.
Not every eye vitamin lives up to its marketing, though. Here’s what the evidence actually supports, how each nutrient works, and the best ways to get them.
Lutein and Zeaxanthin: Your Retina’s Built-In Sunscreen
These two nutrients are the stars of eye health research. Lutein and zeaxanthin are carotenoids, plant pigments that concentrate in the macula, the part of your retina responsible for sharp central vision. Once there, they absorb blue light in the 400 to 500 nanometer wavelength range, essentially filtering out the most damaging light before it reaches the photoreceptors underneath. They also neutralize free radicals and prevent oxidative damage to the delicate lipid membranes in your retina.
The AREDS2 formula includes 10 mg of lutein and 2 mg of zeaxanthin daily. Your body can’t manufacture these compounds, so they have to come from food or supplements. The richest dietary sources are dark leafy greens. A cup of cooked spinach delivers about 20 mg of lutein and zeaxanthin combined, roughly double what’s in the supplement. Turnip greens are nearly as high at around 19.5 mg per cooked cup. Kale, broccoli, peas, corn, and zucchini are also good sources, though at lower concentrations (1.5 to 3.5 mg per cup).
Both lutein and zeaxanthin are fat-soluble, meaning your body absorbs them much better when you eat them alongside some dietary fat. Sautéing spinach in olive oil or adding avocado to a salad with leafy greens makes a real difference in how much your body takes up.
Vitamin A and Night Vision
Vitamin A is essential for producing rhodopsin, the light-sensitive protein in your rod cells that allows you to see in dim light. When you step from a bright room into darkness, your eyes regenerate rhodopsin to adjust. Without enough vitamin A, that process slows down considerably.
Interestingly, moderate vitamin A deficiency doesn’t necessarily raise your baseline night vision threshold. Your eyes can still reach normal sensitivity in the dark. But the time it takes to get there is substantially longer. Severe deficiency is another story: rhodopsin levels can drop to about 70% of normal, and true night blindness sets in. Globally, vitamin A deficiency remains one of the leading preventable causes of blindness, though it’s uncommon in developed countries where diets include adequate animal products and colorful vegetables.
Vitamin A is fat-soluble, so absorption depends on having some fat in your meal. Preformed vitamin A comes from liver, eggs, and dairy. Your body can also convert beta-carotene from orange and yellow vegetables (sweet potatoes, carrots, cantaloupe) into vitamin A as needed.
Vitamin C and Cataracts
Vitamin C is a water-soluble antioxidant found in high concentrations in the fluid inside the eye. Research published in the journal Ophthalmology found that higher dietary vitamin C intake was protective against both existing nuclear cataracts and cataract progression over a 10-year follow-up period. The lens of your eye is particularly vulnerable to oxidative damage over time, and vitamin C helps counteract that process.
There’s an important nuance here. While observational studies consistently link higher vitamin C intake to lower cataract risk, randomized clinical trials of vitamin C supplements alone haven’t replicated that benefit. This suggests that getting vitamin C from food, or as part of a broader nutrient combination, may matter more than popping isolated vitamin C pills. Citrus fruits, bell peppers, strawberries, and broccoli are all excellent sources. The AREDS2 formula includes 500 mg of vitamin C daily, well above the standard recommended intake but within safe limits.
Vitamin E
Vitamin E works alongside vitamin C as a fat-soluble antioxidant, protecting the lipid-rich cell membranes in the retina and lens from oxidative damage. Higher vitamin E intake and blood concentrations have been inversely associated with nuclear cataract risk in multiple studies. As with vitamin C, though, trials of vitamin E supplements in isolation haven’t shown clear benefits. It appears most effective as part of a combination approach.
The AREDS2 formula includes 400 IU (about 180 mg) of vitamin E. Good food sources include almonds, sunflower seeds, hazelnuts, and spinach.
Zinc and Why Copper Comes With It
Zinc is highly concentrated in the retina and the tissue layer behind it. It plays a role in transporting vitamin A from the liver to the retina and supports the enzymes involved in visual function. The AREDS2 regimen includes 80 mg of zinc oxide, a dose well above typical daily intake.
At that level, zinc interferes with copper absorption, which can lead to copper deficiency over time. That’s why AREDS2 supplements always pair zinc with 2 mg of copper oxide. If you take a high-dose zinc supplement for any reason, check whether it includes copper.
Omega-3 Fatty Acids: Weaker Than Expected
Omega-3 fatty acids (EPA and DHA from fish oil) were long recommended for dry eye symptoms, and you’ll still see them marketed for eye health. The evidence, however, hasn’t held up. A major 2018 study of more than 500 people found that fish oil capsules did not improve dry eye symptoms compared to placebo. The American Academy of Ophthalmology notes there is no strong evidence that omega-3 supplements benefit dry eye, and it remains unclear whether dietary sources of omega-3 fats help either.
Omega-3s aren’t harmful, and they have benefits for heart health, but don’t rely on them as an eye health strategy.
The AREDS2 Formula: Who It’s For
The most rigorously tested eye supplement is the AREDS2 formula, developed through large National Eye Institute trials. The full regimen includes vitamin C (500 mg), vitamin E (400 IU), lutein (10 mg), zeaxanthin (2 mg), zinc oxide (80 mg), and copper oxide (2 mg). According to the American Academy of Ophthalmology, this combination can slow vision loss from wet AMD by 25% and slow central vision loss from geographic atrophy (advanced dry AMD) by as much as 35%.
This formula is specifically designed for people with intermediate or advanced AMD. If you have healthy eyes and no family history of macular degeneration, AREDS2 supplements probably aren’t necessary. A diet rich in leafy greens, colorful vegetables, and whole foods provides the same nutrients at more moderate levels. You’ll sometimes see lower-dose versions of these supplements sold over the counter with 5 mg of lutein and 250 mg of vitamin C per softgel, roughly half the clinical dose.
Beta-Carotene: A Cautionary Note
The original AREDS formula included beta-carotene, but AREDS2 replaced it with lutein and zeaxanthin for good reason. Two clinical trials found that smokers taking beta-carotene supplements at doses of 20 to 30 mg per day had a significantly increased risk of lung cancer. The mechanism appears to involve beta-carotene reacting with smoke constituents to produce oxidative metabolites that stimulate cell proliferation rather than suppress it. Even at typical dietary doses, beta-carotene from food decreased these signals, but at supplemental doses in smokers, the effect reversed.
If you smoke or have a history of smoking, avoid supplements containing beta-carotene and look specifically for formulas labeled AREDS2.
Getting These Nutrients From Food
For most people without diagnosed eye disease, food is the best delivery system. A practical daily target for eye health looks something like this:
- Leafy greens (spinach, kale, turnip greens) for lutein and zeaxanthin. One cup of cooked spinach alone exceeds the AREDS2 supplement dose.
- Orange and yellow vegetables (sweet potatoes, carrots, butternut squash) for beta-carotene, which your body converts to vitamin A.
- Citrus fruits and bell peppers for vitamin C.
- Nuts and seeds (almonds, sunflower seeds) for vitamin E.
- Eggs for a combination of lutein, zeaxanthin, zinc, and vitamin A. The yolk contains all four.
Because lutein, zeaxanthin, vitamin A, and vitamin E are all fat-soluble, eating these foods with some healthy fat improves absorption. A salad dressed with olive oil, a stir-fry with greens cooked in avocado oil, or eggs scrambled with spinach are all practical combinations that maximize what your body actually takes in.