These little guys have the highest anti-oxidant capacity of all fresh fruit. They contain Vitamin A, Vitamin B, and Vitamin C. They are also rich in copper which is a very effective immune builder. Their iron content also promotes immunity by raising oxygen concentration in the blood. Frozen blueberries lend themselves well to being used in smoothies since fresh aren’t available this time of year. Dr. Ann gives us a great smoothie recipe using blueberries and pomegranate, a powerful anti-oxidant combo! Combining blueberries and avocado in this smoothie recipe from A Healthy Kitchen gives you Vitamin C and protein making this a great breakfast on the run.