Cold and flu are common problems that occur due to weak immunity. The main function of our immune system is to protect us from the attack of microorganisms. Thus, immune system is responsible for preventing diseases and health problems caused by germs. People who have strong immunity don’t suffer from diseases so much. On the other hand, people with a weak immune system are prone to many types of diseases. You can use natural remedies for boosting the health of immune system. We will suggest some easy natural remedies for this purpose. Following are the best herbs, vitamins and foods to support your immune system.