Moderate evidencevitamin
Vitamin A for Eye Strain
Vitamin A maintains the health of conjunctival goblet cells that produce the mucin layer of the tear film. Adequate vitamin A prevents corneal drying and ensures proper tear film stability, reducing friction and eye strain during prolonged visual tasks.
How strong is the research?
Moderate evidence
Based on cohort study data — strong observational evidence.
Research source
SourceWiseman EM et al. · Nutrients 2017How much to take
2500–5000 IU
Supports tear production and corneal health. Deficiency causes xerophthalmia (dry eyes) contributing to strain.
When to take it
Best taken: with food