This Orange Immune Boost Smoothie is a very delicious way to get your daily dose of Vitamin C, along with many other healthy benefits. Carrots, pineapple and oranges work together to give you plenty of vitamin C, A and K, potassium, calcium, fiber and healthy carbohydrates to fuel your day and boost your immune system. This tasty smoothie also contains three negative calorie foods and a dairy-free yogurt alternative.