For those who have been hearing a lot about flavonoids, it might be helpful to know a little bit more about these relatively unfamiliar nutrients. Bioflavonoids are present in a lot of plant foods and extracts. Fresh fruits and vegetables have their share, as do many traditional medicinal herbs. flavonoids can be part of an active raw food diet, or taken as dietary supplements. These powerful health boosters have a range of positive effects on the body.

More here: http://www.fitday.com/fitness-articles/nutrition/vitamins-minerals/the-importance-of-bioflavonoids.html

My recommendation for right supplement: Little bit more about flavonoids