This herb has eight times more antioxidants than apples and three times as much as blueberries. Antioxidants are an immune-system booster and help to protect your body against the free radical damage that can lead to heart disease, cancer, and even aging skin. Sprinkle oregano over marinated olives, tomato sauce, or stewed tomatoes. Toss a handful into a salad to give it delicate herbal flavor. Add zip to omelettes, beef, and pasta.