Premium quality Siberian chaga mushroom grows only in limited areas. On the map, green color shows where chaga mushroom can be found in general. But yellow color shows where does the real, healing Siberian chaga mushroom grows. We collect our chaga mushroom from Russian Eastern Siberia taiga forests, Altai mountains, Tomsk region, Northern Irkutsk region and Khakassia. These are the areas with winter temperatures as low as -50 degrees Celcius.