Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Bioflavonoids, also known as flavonoids, have a long history of traditional use in supporting eye health, particularly for symptoms such as redness or itching. The rationale stems from their reputed ability to strengthen capillaries, reduce inflammation, and serve as antioxidants. In traditional herbal medicine, bioflavonoid-rich extracts from sources like citrus fruits and bilberry have been used to manage conditions believed to be related to "weak" blood vessels or inflammation, including conjunctival irritation and allergic responses involving the eyes.

However, modern clinical evidence specifically supporting the use of bioflavonoids for red or itchy eyes is limited. Some laboratory and animal studies suggest that flavonoids may help reduce oxidative stress and inflammation, which are relevant to various eye conditions. Nonetheless, there are few, if any, high-quality human trials demonstrating that bioflavonoid supplementation directly relieves redness or itching of the eyes. Most contemporary recommendations for their use in eye health are extrapolated from general antioxidant or anti-inflammatory properties, or from their traditional use, rather than from robust clinical evidence.

In summary, while bioflavonoids have a traditional reputation for supporting eye health and some plausible mechanisms, their use for red or itching eyes is primarily justified by tradition, with only weak scientific evidence (rated 2/5) supporting their efficacy for this specific purpose.

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