Flavonoids are a kind of polyphenol, and the name also refers to a class of plant metabolites.
Recently, there has been much research on flavonoids with regard to their physiological activity, and in particular, their anti-oxidative effects have been reported.
Ginkgo biloba leaves are said to contain as many as 20 types of flavonoids, and among these are quercetin, kaempferol and isorhamnetin, 3 types that are present in large quantities.

Structures of 3 Flavonoids

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