Flavonoids, a class of polyphenolic plant compounds, have been traditionally used in some cultures and complementary medicine systems to support circulatory health. The rationale for their use in treating dizziness is mostly based on their purported ability to strengthen blood vessels, improve microcirculation, and reduce capillary permeability. Dizziness, especially when related to poor circulation or conditions like chronic venous insufficiency, has at times been managed with preparations containing flavonoids (such as diosmin or hesperidin) in European phytotherapy and traditional medicine.

However, direct scientific evidence supporting flavonoids specifically for dizziness is limited. Most clinical research focuses on their benefits for vascular conditions, such as hemorrhoids or varicose veins. Some studies have explored flavonoid use in Meniere’s disease and vestibular disorders, but the results are inconclusive and often of low quality. Reviews and guidelines do not strongly endorse flavonoids for dizziness due to insufficient high-quality evidence.

In summary, while there is a basis in traditional use and some biological plausibility related to vascular health, robust scientific validation for flavonoids as a treatment for dizziness is lacking. The rating reflects the existence of traditional use and limited, indirect scientific rationale rather than direct proof of effectiveness.