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Limited evidenceEye health

Eyebright

A traditional European herb (Euphrasia) named for its folk use in eye complaints. The one randomised placebo-controlled trial of Euphrasia eye drops missed its primary endpoint, and there is no evidence at all that swallowing eyebright capsules does anything for vision.

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What the science says

  • Euphrasia eye drops resolve conjunctivitis and eye discharge Limited evidence

    The only randomised, double-blind, placebo-controlled trial (Meier-Girard 2020, 84 preterm neonates with ocular discharge) found treatment success in 55.0% of the Euphrasia arm versus 51.2% on saline placebo (p=0.85) — no significant difference. Secondary outcomes for redness and tearing trended in Euphrasia's favour but none reached significance.

  • Older clinical evidence supports it Limited evidence

    The most-cited supportive study (Stoss 2000) was an uncontrolled prospective cohort of 65 patients given single-dose Euphrasia drops, in which 53 recovered completely. Without a control arm, this cannot distinguish the herb from the natural resolution of conjunctivitis, which is typically self-limiting, or from the saline vehicle. Reviews of complementary treatments for ocular allergy list eyebright among remedies with traditional use but no controlled efficacy data.

  • Oral eyebright improves eyesight, eye strain or macular health Limited evidence

    There are no human trials of oral Euphrasia for visual acuity, digital eye strain, macular degeneration or cataract. The iridoid glycosides (aucubin, catalpol) and flavonoids in the plant have antioxidant and anti-inflammatory activity in cell models, but that is a mechanism hypothesis, not evidence of a clinical effect after oral dosing.

Dosage & safety

Studied doseNo evidence-based dose exists. Traditional herbals use 2-4 g of dried herb as an infusion up to three times daily, or 1-2 mL of tincture; capsules are typically sold at 400-500 mg two or three times daily. Commercial eye drops are sterile, single-dose, preservative-free Euphrasia preparations (often homeopathically diluted) used up to four times daily — the format tested in the neonatal trial.
SafetyThe single controlled trial reported no safety problems with sterile commercial drops. The real hazard is the traditional practice of home-brewing eyebright tea and using it as an eyewash: non-sterile plant infusions put bacteria and fungal spores directly on the ocular surface and can cause keratitis or serious infection. Never instil anything into the eye that is not a sterile, purpose-made ophthalmic product. Some products are homeopathic dilutions containing no measurable herb. Bacterial conjunctivitis with significant pain, light sensitivity or vision change needs medical assessment, not an herbal drop.

How to take it

TimingTiming does not matter; no dose or schedule has been established for oral use.
With food?Either way for the tea or capsules.
Worth knowingNever put home-brewed eyebright tea in your eye — only sterile, single-dose, preservative-free ophthalmic products belong on the ocular surface, and non-sterile infusions can cause keratitis.

Frequently asked questions

Does eyebright improve eyesight?

There is no evidence that oral eyebright improves eyesight: no human trials exist of Euphrasia for visual acuity, eye strain, macular degeneration or cataract. The evidence grade is limited.

Do eyebright eye drops work for conjunctivitis?

The only placebo-controlled trial of eyebright (Euphrasia) eye drops, in 84 newborns with eye discharge, found 55.0% success versus 51.2% on saline, with no significant difference. Older supportive studies had no control group.

Can I use eyebright tea as an eyewash?

No. Home-brewed eyebright tea is not sterile and can put bacteria and fungal spores on the eye, causing keratitis or serious infection; only sterile, purpose-made ophthalmic products belong in the eye.

Scientific references

Where to buy

Nature's Way, Eyebright, Herbal Blend, 100 Vegan Capsules

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