Berries are one of the healthiest snacks you can eat. In fact, most berries are a great source of vitamin C and antioxidants. Strawberries are one of the best sources of vitamin C you can consume. Blueberries are a great source of vitamin K and manganese. Raspberries are a great source of vitamin C, manganese, and fiber. Blackberries are a great source of vitamin C, vitamin K, manganese, and fiber.