Looking for the best source of antioxidants? Vitamins A, C, E, carotenoids (like beta-carotene) and minerals are antioxidants. The best way to obtain them is to eat fruits, vegetables, whole grains, nuts and seeds. Top antioxidant foods include blueberries, blackberries, cherries, red grapes, Granny Smith apples, carrots, broccoli, green pepper, sweet potatoes, cooked tomatoes, walnuts, sesame seeds, almonds, kidney beans, red beans and pinto beans. Tea is also a rich source of antioxidants called flavonoids. Wine and coffee contain antioxidants called polyphenols!