Evidence supporting the use of: Vitamin C (ascorbic acid)
For the health condition: Eye Problems

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Synopsis

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

Vitamin C (ascorbic acid) has been studied for its potential role in supporting eye health, particularly in relation to cataracts and age-related macular degeneration (AMD). Scientific evidence suggests that oxidative stress plays a significant role in the development of these eye conditions, and as a potent antioxidant, vitamin C may help neutralize free radicals in ocular tissues. Large epidemiological studies, such as the Age-Related Eye Disease Study (AREDS), have investigated the impact of antioxidant supplementation on eye disease progression. The AREDS and AREDS2 trials found that a combination of antioxidants—including vitamin C (500 mg/day), vitamin E, beta-carotene (later replaced by lutein and zeaxanthin), zinc, and copper—significantly reduced the risk of progression to advanced AMD in individuals at high risk. However, vitamin C alone has not been conclusively shown to prevent or treat eye diseases, and its benefits are most evident as part of a broader antioxidant regimen. For cataracts, some observational studies indicate that higher vitamin C intake may be associated with a reduced risk, but randomized controlled trials offer mixed results. Overall, while vitamin C is not a cure or standalone treatment for eye problems, its inclusion in combined antioxidant therapies is supported by moderate-quality scientific evidence for slowing the progression of certain age-related eye conditions.

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