Walk into any pharmacy or health shop in the UK and you will find a shelf full of eye supplements: lutein, zeaxanthin, omega-3, vitamin C, zinc, blueberry, and more. The claims on the boxes are broad and the prices vary a lot. If you want to look after your sight, it is fair to ask a simple question: which of these are actually worth taking, and does taking them really make a difference?
This article looks at what good-quality research says about the most studied eye supplements. It also explains something the packaging rarely mentions: the way you take a supplement can matter as much as the supplement itself.
Why the Eye Depends So Much on Good Nutrition
The retina is one of the most energy-hungry tissues in the body and is packed with tiny power plants called mitochondria. All that activity produces harmful molecules known as free radicals. Over time, this kind of wear and tear, called oxidative stress, is thought to play a part in age-related macular degeneration (AMD) and cataracts.
The cornea is built largely from collagen, and the body needs vitamin C to make collagen well. The lens has to stay clear for a lifetime, and oxidative damage to its proteins is part of how cataracts form. Dry eye disease has a strong inflammatory side that certain fats in the diet can influence.
AREDS2: The One Formula With Strong Trial Evidence
The Age-Related Eye Disease Studies (AREDS and then AREDS2), run by the US National Eye Institute, showed that a specific combination of nutrients can slow the progression of AMD in certain people. AREDS2 updated the original recipe by removing beta-carotene and adding lutein and zeaxanthin. Beta-carotene was dropped because earlier research linked it to a higher risk of lung cancer in people who smoke or used to smoke.
The AREDS2 daily formula contains lutein 10mg and zeaxanthin 2mg, vitamin C 500mg, vitamin E 400 IU, zinc 80mg (some versions use a lower 25mg dose), and copper 2mg. The copper is included because high-dose zinc can lower the body's copper levels.
This formula is for people who already have intermediate AMD, or advanced AMD in one eye. In that group it meaningfully reduces the chance of the disease getting worse. It has not been shown to prevent AMD in people who do not have it. If you are considering it, the sensible first step is a proper macular assessment so you know whether it is actually right for you.
Lutein and Zeaxanthin: The Pigments That Shield the Macula
Lutein and zeaxanthin are the only nutrients from food that build up in the macula, the central part of the retina that gives sharp, detailed vision. There they form a yellow pigment that filters some blue light and soaks up harmful molecules. Good food sources are dark leafy greens such as kale and spinach, egg yolks, and yellow or orange vegetables.
A typical Western diet gives only about 1 to 2mg of these pigments a day, well below the 10mg and 2mg used in AREDS2. Because these pigments are fat-soluble, they are absorbed far better when taken with a meal that contains some fat, such as olive oil, avocado, nuts or full-fat dairy. Taken on an empty stomach, much of the dose is wasted.
Omega-3 and Dry Eye: A Sensible Idea With Mixed Evidence
Omega-3 fats, mainly EPA and DHA, are often suggested for dry eye disease. DHA is a building block of the retina, and these fats can calm inflammation, including in the meibomian glands, the tiny oil glands in the eyelids whose blockage is the most common cause of dry eye.
The evidence is genuinely mixed. The large, carefully run DREAM trial found that omega-3 supplements were no better than a placebo for people with moderate to severe dry eye. A Cochrane review concluded that any benefit is, at best, uncertain. Current expert guidance from TFOS DEWS III therefore treats omega-3 as a reasonable option to try in some people rather than a proven treatment.
If you do try it, the doses used in studies are usually around 2,000 to 3,000mg of combined EPA and DHA a day. The re-esterified triglyceride (rTG) form is absorbed better than the cheaper ethyl ester form found in many budget products. If you take blood-thinning medicines, check with your doctor or pharmacist first.
Vitamin C: The Antioxidant the Eye Stockpiles
The fluid inside the front of the eye holds vitamin C at levels many times higher than in the blood. Vitamin C helps protect the cornea from sun damage, supports collagen, and helps keep the lens clear. Studies have linked a higher long-term intake of vitamin C from the diet with a lower rate of certain cataracts, but trials of supplements have not clearly shown that they prevent them. The simplest message is to aim for a good dietary intake. Splitting a 500mg target into two smaller doses is absorbed a little better than one large dose.
Zinc and Vitamin D
Zinc sits in high amounts in the retina, where it helps several enzymes work and supports the use of vitamin A. The 80mg of zinc in AREDS2 is far above the everyday UK guideline of 9.5mg for men and 7mg for women. That high dose is meant only for managing AMD under specialist guidance. Too much zinc over time can lower copper levels, which is exactly why AREDS2 pairs it with copper.
Research into vitamin D and the eye is still at an early stage. Some observational studies have linked low vitamin D with more troublesome dry eye and allergy, but this is not yet strong enough to call vitamin D a treatment for any eye condition. The official UK advice is to consider a daily supplement of 10 micrograms (400 IU), particularly in autumn and winter.
Why How You Take Them Matters
Take fat-soluble nutrients (lutein, zeaxanthin, vitamin E, vitamin D and omega-3) with a meal that contains some fat. Do not take zinc and iron supplements at the same time, as they compete for absorption. Separate them by at least two hours. Split a vitamin C dose into two, as the gut can only absorb so much at once. Choose products with independent third-party testing, as UK supplement labels are lightly regulated.
Eye Supplements at a Glance
The table below summarises the main options, how strong the evidence is, and how to get the most from each one. It is a guide, not a prescription.
References
- Age-Related Eye Disease Study 2 (AREDS2) Research Group. Lutein + zeaxanthin and omega-3 fatty acids for age-related macular degeneration: the AREDS2 randomized clinical trial. JAMA. 2013;309(19):2005–2015.
- Age-Related Eye Disease Study Research Group. A randomized, placebo-controlled clinical trial of high-dose supplementation with vitamins C and E, beta carotene, and zinc for age-related macular degeneration and vision loss: AREDS Report No. 8. Arch Ophthalmol. 2001;119(10):1417–1436.
- The Alpha-Tocopherol, Beta Carotene Cancer Prevention Study Group. The effect of vitamin E and beta carotene on the incidence of lung cancer in male smokers. N Engl J Med. 1994;330(15):1029–1035.
- National Institute for Health and Care Excellence. Age-related macular degeneration. NICE Guideline NG82. London: NICE; 2018.
- Bernstein PS, Li B, Vachali PP, et al. Lutein, zeaxanthin, and meso-zeaxanthin: the basic and clinical science underlying carotenoid-based nutritional interventions against ocular disease. Prog Retin Eye Res. 2016;50:34–66.
- Dry Eye Assessment and Management (DREAM) Study Research Group. n-3 fatty acid supplementation for the treatment of dry eye disease. N Engl J Med. 2018;378(18):1681–1690.
- Downie LE, Ng SM, Lindsley KB, Akpek EK. Omega-3 and omega-6 polyunsaturated fatty acids for dry eye disease. Cochrane Database Syst Rev. 2019;(12):CD011016.
- Tear Film and Ocular Surface Society. TFOS DEWS III Management and Therapy Report. The Ocular Surface; 2025.
- Dyerberg J, Madsen P, Moller JM, Aardestrup I, Schmidt EB. Bioavailability of marine n-3 fatty acid formulations. Prostaglandins Leukot Essent Fatty Acids. 2010;83(3):137–141.
- Jacques PF, Taylor A, Hankinson SE, et al. Long-term vitamin C supplement use and prevalence of early age-related lens opacities. Am J Clin Nutr. 1997;66(4):911–916.
- Scientific Advisory Committee on Nutrition. Vitamin D and Health. London: SACN; 2016. (UK advice: 10 micrograms / 400 IU daily, particularly in autumn and winter.)
