Russia Tajikistan Poland Fermented and slightly sparkling drink. There is two sorts of kefir : milky and fruity. Due to the fermentation this drink might be slightly alcoholized (1%). Milk or fruit kefir is an ancient form of fridgeless preservation of perishable food that was used by nomads until high antiquity. Alive food formed of micro-organisms, kefir is considered as a probiotic and is appreciated for its digestive qualities : cleanse intestines naturally, support transit, reduce flatulence, etc. Russians have an abundant medical and scientific litterature about kefir and consider than its regular consumption improve general health status. They even call it the centenaries food. Kefir powder is available in pharmacy or in bio grocery.