Chaga contains more than 200 different biologically active substances. It is a highly valued wood-destroying fungus from the leathery family. We find it in the herbariums of the traditional peoples of Siberia, Korea, China and Scandinavia. The best species grow on birch trunks. Yield obtained from 100% Siberian Chaga obtained by a special double extraction method. The content of polysaccharides more than 40% and triterpenoids more than 4% ensures high efficiency of the product.