When it comes to power foods, elderberry towers above other berries reputed to boost the defense system. Bioflavonoid-rich, elderberries also boast proteins that help destroy a cold and flu virus’ ability to infect a cell. Though you may not be aware that you consume flavonoids every day, they make up the largest group of phytochemicals, and are a vital part of maintaining health as we age. (They like to eat up free radicals while supplying antioxidants.) Flavonoids are found in the colorful fruits and vegetables on your plate, so even if youve never heard of the word flavonoid, theyve been helping you out your entire life.