Flavonoids are a diverse group of plant compounds that belong to the larger class of phytonutrients known as polyphenols.
They are widely distributed in various fruits, vegetables, herbs, and beverages like tea and wine.
Flavonoids are responsible for the vibrant colors of many plant tissues, such as the red, blue, and purple hues in berries
and the yellow and orange tones in citrus fruits.
There are more than 6,000 known flavonoids, and they can be categorized into
several subclasses based on their chemical structures, including flavonols,
flavones, flavanones, flavan-3-ols (catechins), anthocyanins, and isoflavones.