Herbs have been used for centuries to support immune function and, when needed, to kick it into overdrive to beat an infection or disease. And while conventional medicine has traditionally focused its immune-system strategies on curing infections, herbalism has centered on the belief that supporting and nourishing the immune system will result in fewer and less severe infections — and better health overall. Happily, conventional practitioners are increasingly supportive of this notion, and research consistently proves the immune-boosting power of herbs.