As soon as the winter hits, cold and flu season also begins. With no known cure for cold and flu, over-the-counter medicines can at best bring relief from symptoms. However, research and studies show that herbs can help to ease the flu symptoms and also reduce the duration of illness. Here are 5 anti-flu herbs that can strengthen your immune system, reduce the duration of illness and also prevent contracting flu virus when winter hits. These herbs with anti-microbial properties have been used for generations to fortify body’s natural tendencies to fight virus and bacteria and also bring relief from the symptoms quickly when we catch cold or flu.