Not as widespread as Flavonols, Flavones can be found in some herbs and plants but their amounts and occurrence is far from being close to that of Flavonols. We can find Flavones in the leaves of Carya cathayensis, where it was found to exert certain anti-tumor properties.

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Onions are a great source of flavonols [1]. Quercetin, a well known flavanol, is used to treat allergies [1]. Cacao is another source of flavanols, containing other types of flavanols as chatechins and epicatechins [11], which have been reported to have a very effective vasodilatory effect due to the effects on the mechanisms of Nitric Oxide [14], increasing the synthesis of this one and the blood flow as a consequence of this.