This antioxidant and vitamin-rich dark berry could help you ward off illness, says Mobley. Researchers at the University of Giessen in Germany found that liquid elderberry extract was strong enough to destroy disease-causing bacteria and flu viruses. “Elderberries are filled with antioxidants and vitamins, namely Vitamin C and A. Any foods or medicine high in antioxidant status would help to ward off bacterial and viral infections, as well as support the heart, lungs and eyes,” explains Mobley, who recommends a daily teaspoon of elderberry syrup. She likes Gaia herbs’ organic elderberry syrup because it’s free of high fructose corn syrup, artificial colors and flavorings, preservatives and pesticides.