1 / 5
Flavonoid is a large class of naturally occurring polyphenols found in plants. They are widely distributed in fruits (such as berries), vegetables (such as onions and cruciferous vegetables), tea, kudzu root, and ginkgo, with 2-phenylchromone as their core skeleton.
Apples, onions, tea, citrus fruits, berries, cocoa, wine, and traditional Chinese medicine are all rich in flavonoids.