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Review of 57 Trials Finds Fish Oil Barely Moves Dry Eye Symptoms

A review of thousands of dry eye patients found popular oral supplements produced only small, inconsistent improvements in symptoms and tear quality.

By Dr. Josh Axe · October 31, 2026 · 1 source · Watch

Photo: Pexels

At a glance

What they found: Marine omega-3 supplements lowered a standard symptom score by 4.4 points and lengthened tear break-up time by 1.3 seconds.

A systematic review published October 28, 2026 in Seminars in Ophthalmology pooling 57 randomized trials found that oral supplements for dry eye disease, including marine omega-3 fatty acids, produced only small and often unreliable improvements in symptoms and tear quality.

57trials, 6,615 people

4.4pt lower symptom score

1.32sec longer tear time

The review, published October 28, 2026 in Seminars in Ophthalmology, searched five databases and two trial registries through June 18, 2026, and pooled 57 randomized trials covering 6,615 people with dry eye disease, with a primary analysis of 29 trials and 2,272 people comparing oral supplements against placebo or no supplement. Marine omega-3 fatty acids, tested in 6 trials, were linked to a 4.4-point drop on the Ocular Surface Disease Index, a standard symptom questionnaire (95% confidence interval, -9.0 to 0.2), and omega-3 combination products, tested in 4 trials, were linked to a 5.2-point drop (-8.8 to -1.7). Both fell short of the 7-point change researchers consider meaningful to patients. Marine omega-3 was also linked to a longer tear break-up time, a measure of how long the tear film stays intact on the eye's surface, with an average gain of 1.32 seconds and a range of 0.05 to 2.60 seconds.

The authors rated certainty as very low for 40 of 48 comparisons and low for the remaining 8, and noted that every comparison between supplement classes was indirect, drawn from trials that used different designs and control groups.

Dry eye happens when tears evaporate too quickly or aren't produced well enough to coat the eye's surface. Omega-3 fats are thought to support the oily layer of the tear film that slows evaporation and to calm surface inflammation, the general rationale behind these trials, though this review did not test that mechanism itself.

Symptom Score Change With Omega-3 Supplements vs Control

Seminars in Ophthalmology, 2026, Alamoudi et al.

Twenty of the 57 trials reported no safety data at all, and the authors conclude that current evidence does not support routine use of any one supplement class, since effects were small, imprecise or inconsistent and classes could not be reliably ranked against each other.

Dr. Axe’s Take

A 4- to 5-point shift on a symptom scale, with very low certainty behind it, is not something I'd build a dry eye plan around. I would still get more omega-3s from food, cold-water fish like salmon and sardines a couple times a week, plus walnuts, chia and flax seeds, since the tear film depends on healthy fats regardless of what any single supplement trial shows. I'd also look at screen habits and home humidity before expecting one nutrient to solve chronic dry eye.

— Dr. Axe

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Study summary

Who: 6,615 participants with dry eye disease across 57 randomized trials; primary analysis used 2,272 people in 29 trials
Design: Systematic review and network meta-analysis of randomized trials, searched through June 18, 2026
Dose: Oral supplements including marine omega-3 fatty acids (6 trials) and omega-3 combination products (4 trials), versus placebo or no supplement
Primary result: Marine omega-3: 4.4 points lower on symptom score (95% CI -9.0 to 0.2); omega-3 combinations: 5.2 points lower (-8.8 to -1.7); both below the 7-point meaningful threshold
Secondary: Marine omega-3 linked to a 1.32-second longer tear break-up time (range 0.05 to 2.60 seconds); certainty very low for 40 of 48 comparisons, low for 8; 20 trials reported no safety data
Funding / conflicts: Funding and conflicts not reported in the abstract.
Date: Oct 28, 2026