I had kefir all last winter and it really did improve my gut we have goats and I am ok with goat milk ( but not cows milk ) so we just made it from that - raw unpasturised milk of course as heating milk destroys the enzymes

once summer came ( I am in australia it is summer now ) the heat made the kefir much stronger and it smelled more of alcohol ........ I noticed my hands were much number and eventually stopped the kefir to see if it was the alcohol - which it turned out it was. I cannot tolerate alcohol at all

so back to yogurt at least for the summer and I notice my gut has got worse again

koz