Siberian chaga Siberian chaga (Inonotus obliquus) is a highly valued tonic mushroom (mushroom), long used in traditional Siberian, Korean, Chinese, northern European and Scandinavian traditional medicine. Siberian wild chaga has been found to grow in old forests across colder areas of northern Asia and Northern Europe. It is believed to come from subarctic Siberian birch forests. When it comes to chaga mushrooms, its healing properties are famous. Asian herbalists believe tha