It means black tea fungus. Gowasu is a low-alcohol beverage, which is very popular in Russia, Ukraine and other eastern European countries. It is fermented from dry bread, and its color is similar to beer but slightly red. Because its alcohol content is only about 1%, in Russian cities, Kvas can also refer to black tea fungus. Gowasu beverage has the unique flavor of fermented wheat milk and hops. Gowasu adopts bioengineering technology, taking Russian bread, hops and maltose as raw materials, and mixing probiotics, lactic acid bacteria and other strains. Gowasu beverage contains amino acids, vitamins, lactic acid and other nutrients, which can promote the health of intestinal digestive system at all levels. Probiotics can inhibit the reproduction of harmful bacteria in the intestine, reduce toxins and promote intestinal peristalsis, thus improving intestinal function and defecation conditions.