Best Supplements for Dry Eyes: Omega-3s, GLA, and…

Dry eye disease affects an estimated 16 million Americans and causes chronic discomfort, light sensitivity, blurred vision, and reduced quality of life. While artificial tear drops and lifestyle changes are the first line of defense, a growing body of research supports targeted supplementation as a powerful tool for addressing the underlying causes of dry eye from the inside out.

What Causes Dry Eye Disease

Dry eye is not simply a lack of tears. It is a multifactorial disease involving instability and inflammation of the tear film. The tear film has three layers: a mucin layer (produced by goblet cells in the conjunctiva), an aqueous layer (produced by the lacrimal glands), and an oily lipid layer (produced by the meibomian glands in the eyelids).

The majority of dry eye cases — estimated at 85% — involve meibomian gland dysfunction (MGD), where the glands produce insufficient or poor-quality oil, causing rapid tear evaporation. Chronic inflammation then damages the ocular surface further, creating a self-perpetuating cycle.

Systemic inflammation, nutritional deficiencies, hormonal changes (especially in postmenopausal women), certain medications (antihistamines, antidepressants, blood pressure drugs), and digital screen use are major contributing factors.

Omega-3 Fatty Acids: The Most Evidence-Backed Supplement

EPA and DHA omega-3 fatty acids have the strongest evidence for dry eye relief among all nutritional interventions. They work through multiple mechanisms: reducing systemic and ocular inflammation, improving meibomian gland lipid secretion quality, and enhancing lacrimal gland function.

A 2018 Cochrane-level meta-analysis of 17 randomized controlled trials found that omega-3 supplementation significantly reduced dry eye symptom scores and improved tear break-up time (TBUT) — an objective measure of tear film stability — compared to placebo.

The American Academy of Ophthalmology includes omega-3 supplementation among its recommended management strategies for dry eye disease. Effective doses in trials range from 1,500 to 3,000 mg combined EPA+DHA daily. Triglyceride-form fish oil is preferred for bioavailability; algae-based omega-3s are the alternative for vegetarians.

Allow at least 3 months before assessing response, as meibomian gland improvement takes time.

Gamma-Linolenic Acid (GLA)

GLA is an omega-6 fatty acid that — unlike most omega-6s — has anti-inflammatory rather than pro-inflammatory effects. It is found primarily in evening primrose oil (EPO), borage oil, and black currant seed oil.

GLA suppresses the production of inflammatory prostaglandins and cytokines in ocular surface tissue. A randomized trial published in Cornea found that combined GLA and EPA supplementation significantly reduced dry eye symptoms and conjunctival goblet cell loss — a marker of ocular surface inflammation — compared to placebo.

GLA is often combined with omega-3s in specialized dry eye formulas (such as TheraTears Nutrition and HydroEye), with typical GLA doses of 200–300 mg daily.

Vitamin D

Vitamin D deficiency has been linked to dry eye disease in multiple cross-sectional studies. Vitamin D receptors are expressed in the lacrimal gland and meibomian glands, and deficiency impairs their function.

A randomized trial in the journal Eye found that vitamin D supplementation (1,000 IU daily) significantly improved dry eye symptoms and objective tear parameters compared to placebo in deficient patients. Testing 25-OH vitamin D levels before supplementing is advisable; optimal levels for eye health appear to be above 40 ng/mL.

Vitamin A

The cornea and conjunctiva require vitamin A to maintain their epithelial integrity and goblet cell density. Goblet cells produce the mucin layer of the tear film, which allows tears to adhere to the ocular surface. Vitamin A deficiency causes goblet cell loss and secondary dry eye symptoms.

Topical vitamin A drops are used clinically for severe ocular surface disease. Oral vitamin A sufficiency is important for supporting normal ocular surface architecture.

Flaxseed Oil

Flaxseed oil provides ALA (alpha-linolenic acid), the plant-form omega-3 that serves as a precursor to EPA and DHA. While ALA-to-EPA/DHA conversion is inefficient in most people, flaxseed oil shows independent anti-inflammatory effects at the ocular surface. It is an option for those who cannot tolerate fish oil.

A randomized trial found that 1–2 tablespoons of flaxseed oil daily for 45 days significantly reduced dry eye symptom scores, particularly in contact lens wearers.

Comprehensive Dry Eye Supplement Strategy

For most people with mild to moderate dry eye, start with:

Omega-3s: 2,000–3,000 mg EPA+DHA daily
GLA: 200–300 mg daily (often combined with omega-3s in dry eye formulas)
Vitamin D: 2,000 IU daily (or more if deficient)

Allow 3 months for assessment. Pair supplementation with heat and massage therapy for meibomian gland dysfunction, lid hygiene, reduced screen time with structured breaks, and humidified air environments.

FAQ

Q: How long do omega-3 supplements take to relieve dry eye symptoms? A: Most people see improvement in symptoms within 6–12 weeks of consistent supplementation. Objective tear measures typically improve over 3–6 months.

Q: Are there supplements that make dry eyes worse? A: High-dose niacin (vitamin B3) can worsen dry eye in some individuals. Certain herbal supplements may interact with tear production. Diuretics and antihistamines (sometimes taken as supplements for allergies) can reduce lacrimal secretion.

Q: Do dry eye supplements replace artificial tear drops? A: No — supplements address the underlying cause from the inside, while drops provide immediate surface lubrication. They work best in combination.

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Best Supplements for Dry Eyes: Omega-3s, GLA, and More