Kefir is simply another form of yogurt lah , different nationalities have diffent kind of this .the Koreans kimchi ? Yes ,kimchi you eat is actually a fermented stuff for aiding digestion , the Indonesians ? The tempeh ! Yes that cheap stuff , it’s highly valued as a digestive material by the Germans
the Indians among us got the mostest , the yogurt is simply one that is served in every traditional Tamil food as a last dish but the Sinkies pariahs donch follow with their fish head curry and what not , the Thosai ,is another , made of fermented flour overnight and the vadas too ...but nothing of all these will solve a digestive system that is Aging
otherwise , a spoonful of ashfordida, hope got the spelling right , will put immediate stop to furts