Reishi mushroom – Ganoderma lucidum (also known as Lingzhi or Reishi) is known as a valuable medicinal mushroom with many positive health effects. G. lucidum in the mushroom helps stimulate the immune system and acts as a very powerful antioxidant. In addition, some studies show that Reishi may help reduce the size and mass of tumors in certain types of cancer and improve the quality of life of patients.