Reishi and Shiitake mushrooms have been used in Asian medicine for years. Mushrooms are commonly used in soups, salads and as additions to many other dishes throughout history. Some people believe Reishi mushrooms support immune, respiratory, cardiovascular health and may support treatment of cancer, AIDS/HIV, shingles, blood pressure, tumors, and insomnia. Reishi mushrooms have also been used to help relieve stress and fatigue symptoms. Shiitake and Reishi mushrooms are a very good source of iron as well.