Supplement analysis backed by scientific evidence · PT

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Limited evidenceEye health

Eye Strain Formulas

Multi-ingredient blends for screen fatigue, usually built around lutein, zeaxanthin, astaxanthin and bilberry. A few individual ingredients have small positive RCTs, but the blends as sold are untested and the trials are mostly manufacturer-funded.

Evidence last reviewed: August 2026

What the science says

  • Lutein and zeaxanthin for screen-related eye strain Limited evidence

    A randomised, double-blind, placebo-controlled study in high electronic screen users reported improvements in self-reported eye strain, sleep and attention with a lutein/zeaxanthin preparation. The sample was small and the trial was funded by the ingredient supplier, and a separate RCT in children found gains mainly in visual and cognitive performance measures rather than symptom relief.

  • Astaxanthin for digital eye strain Limited evidence

    A randomised double-blind placebo-controlled trial reported improvements in acute and chronic digital eye strain in children taking a branded astaxanthin. It is a single manufacturer-sponsored trial in a specific population, and no independent replication exists.

  • Blends as sold Limited evidence

    No trial has tested a typical commercial multi-ingredient eye strain formula against placebo. Combining ingredients that each have thin, sponsor-linked evidence does not add up to a demonstrated effect, and doses of individual actives in blends are often below those studied.

Dosage & safety

Studied doseIngredient trials used approximately 10–20 mg lutein with 2–4 mg zeaxanthin, or 4–12 mg astaxanthin, daily with food for 8–12 weeks. Compare a blend's per-ingredient amounts against these before assuming equivalence.
SafetyThe main carotenoid ingredients are well tolerated, with skin yellowing at high lutein doses. Smokers should avoid formulas containing beta-carotene because of increased lung cancer risk. Astaxanthin may lower blood pressure slightly and has mild antiplatelet activity — use caution with antihypertensives and anticoagulants. Most importantly, persistent eye strain, dryness or blurred vision deserves an eye examination rather than a supplement, since the usual causes are uncorrected refractive error, dry eye and screen habits.

Scientific references

Where to buy

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