It does have medicinal effects. According to scholars' research, in the 16 and 17 centuries, chaga was widely used by people in Eastern Europe, Russia, Poland, Finland and other places. Prevent and treat various intractable diseases, such as various digestive organ cancers (gastric cancer, esophageal cancer, intestinal cancer, liver cancer), heart disease, leukemia, diabetes, etc. , have shown excellent results. Clinical experiments from Russia and Japan have confirmed that Chaga can obviously improve human immunity, inhibit the proliferation and metastasis of tumor cells, and effectively prevent cancer in patients with gastric ulcer. For a long time, the First Medical Research Institute of St. Petersburg, Russia, which has been devoted to the study of Shaka, has applied Shaka to many inoperable patients with advanced cancer, and found many gratifying changes, such as patients recovering their appetite and beginning to experience pain relief and weight gain. This improvement has enabled most patients to prolong their lives and gain the confidence and courage to actively fight cancer. Studies by authoritative research institutions in Japan show that the main effective component of Inonotus obliquus is polysaccharide, of which β -glucan is the most important. Both water-soluble polysaccharides and water-insoluble polysaccharides have been proved to have good anti-cancer, hypoglycemic and immune resuscitation effects, and can inhibit the spread of cancer cells and prevent cancer recurrence. It can also enhance human immunity and reduce the side effects of chemotherapy, radiotherapy and surgery. The deadly tumor of birch is the best anticancer drug for human beings.