 There are six subclasses of flavonoids, and one of them is called flavothriols, and tea falls into that category, also into the flavonols. So black tea, white tea, green tea, that falls in there. And if tea is not to your taste? Red wine falls into there, too. Ah, yes, but of course, a word of caution there. While that's really good for the flavonoid compounds, you don't want to go overboard on consuming those.