A birch mushroom – chaga has unique properties. During its growth from a spore to a large body, it is saturated with useful substances from birch sap and other components. The mushroom contains many active substances and trace elements, therefore it is considered a valuable natural medicine. Chaga is called not only the growth on the tree itself, but also the drink made from it. It is often used as a preventive, general tonic and is drunk as tea; in the heat, it perfectly quenches thirst.