By goal
Evidence-Backed Supplements for Eye Health and Vision
Worries about age-related macular degeneration, dry eyes, night vision and long-term sight push many people to look for supplements that protect the eyes. The evidence here is uneven, so we grade each option by what trials actually show. The strongest signal is for getting enough vitamin A, which prevents deficiency-related blindness but can harm when taken in excess, plus a nutrient-dense diet built around foods like spinach. Lutein and zeaxanthin have moderate, randomized-trial support for modestly slowing progression to advanced macular degeneration, and they travel alongside zinc, vitamin C and carotenoid-rich foods such as kale, sweet corn, carrots, collard greens and romaine lettuce. Omega-3s help the wider body but show mixed results for dry eye. Saffron, astaxanthin and goji berry remain preliminary, resting on small or early studies. We include dosing context and safety notes for each. This is educational information, not medical advice; talk to your doctor or pharmacist before starting any supplement.
| Supplement | Evidence for this goal | Typical dose | Key caution | Studies |
|---|---|---|---|---|
| Omega-3 (EPA/DHA) | Strong | 1–2 g combined EPA+DHA/day; up to 4 g (Rx) for high triglycerides. | Safe at typical doses. | 20 |
| spinach | Strong | Standard serving: 1 cup, raw (30 g). Eat whole (with skin where edible)… | High in oxalate (~750 mg/100g raw) — relevant for calcium-oxalate kidney stone formers, who… | 10 |
| Vitamin A (Retinol / Beta-Carotene) | Strong | Adult RDA: 900 mcg RAE/day (men), 700 mcg RAE/day (women); ~770 mcg in… | Preformed vitamin A is fat-soluble and accumulates; chronic intake above the 3,000 mcg/day… | 8 |
| carrot | Moderate | Standard serving: 1 cup chopped, raw (128 g). Eat whole (with skin wher… | Whole carrots are very safe. | 10 |
| collard-greens | Moderate | Standard serving: 1 cup chopped, raw (36 g). Eat whole (with skin where… | Very high vitamin K (~157 ug per cup raw, far more when cooked-concentrated) can antagonize… | 10 |
| kale | Moderate | Standard serving: 1 cup chopped, raw (67 g). Eat whole (with skin where… | Very high vitamin K1 can destabilize INR in patients on warfarin—keep intake consistent and… | 9 |
| Lutein & Zeaxanthin | Moderate | 10 mg lutein + 2 mg zeaxanthin daily (the AREDS2 dose); MPOD studies su… | Generally recognized as safe at typical supplemental doses (up to ~20 mg/day lutein); the A… | 19 |
| romaine-lettuce | Moderate | Standard serving: 1 cup shredded, raw (47 g). Eat whole (with skin wher… | High in vitamin K (about 48 ug per cup), which can interfere with warfarin and similar anti… | 8 |
| Saffron | Moderate | 30 mg/day standardized extract. | Safe at supplement doses. | 20 |
| sweet-corn | Moderate | Standard serving: 1 cup kernels, cooked/boiled, drained, no salt (164 g… | Generally very safe and a common dietary staple. | 11 |
| Vitamin C | Moderate | 75–90 mg/day RDA; 200 mg saturates tissues. Doses >1g mostly excreted. | Safe. | 21 |
| Zinc | Moderate | 8–11 mg/day RDA; up to 40 mg upper limit. Lozenges (75mg+/day) only sho… | Safe within limits (adult upper limit ~40 mg/day). | 21 |
| Astaxanthin | Preliminary | 4–12 mg/day (most trials used 4–6 mg/day). | Generally well tolerated at 4–12 mg/day. | 20 |
| Goji Berry | Preliminary for this goal | 15–45 g dried berries/day, or equivalent juice/extract. | Safe as a food. | 18 |
| Vitamin E (Tocopherol) | Mixed | RDA ~15 mg/day (22.4 IU); doses ≥400 IU/day raise safety concerns. | Topical vitamin E commonly causes contact dermatitis (~1 in 3 in the Baumann scar trial). | 20 |