Because antioxidants are just a component of flavonoids.
Flavonoids include antioxidants in their composition
Because flavonoids have more actions on the body than its role as an antioxidant. For example, flavonoids also are anti-viral.
they are a specific type of antioxidant that have more overall health benefits compared to a pure antioxidant that is more specific for correcting the free radical damage that cause different cancers
because I thought it was the best choice.
Because your body can't make it.