Evidence supporting the use of: Vitamin C (mixed)
For the body system: Eyes

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Table of Contents

Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Vitamin C (ascorbic acid) is scientifically recognized as an essential nutrient for eye health, particularly in the context of age-related eye diseases. Several large-scale studies, such as the Age-Related Eye Disease Study (AREDS) sponsored by the National Eye Institute, have shown that high-dose antioxidant supplementation, including vitamin C, can slow the progression of age-related macular degeneration (AMD) in people at high risk for the disease. Vitamin C’s antioxidant properties help protect ocular tissues from oxidative damage caused by free radicals, which are implicated in the development of cataracts and macular degeneration. Observational studies have found that individuals with higher dietary intakes of vitamin C tend to have a lower risk of developing cataracts. However, evidence from randomized controlled trials regarding vitamin C supplementation alone (not as part of a multivitamin or antioxidant combination) is less consistent. The strongest evidence supports its use as part of a combined antioxidant regimen. No major historical or traditional use of vitamin C specifically for eye health exists prior to its scientific investigation. Thus, while vitamin C is scientifically validated as beneficial for eye health, especially in combination with other nutrients, the evidence is moderate rather than definitive when vitamin C is considered in isolation.

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