Ive been a fan of kefir for a while now.
I never used to get heartburn until 8 or 9 years ago when I started getting really bad symptoms. Kefir turned that around. Im back to drenching my hot wings in some Insanity sauce at the wing shop with no complaints. It got me into fermenting my garden produce too. Which give me plausible deniability for all the glass jars
Anecdotally. My father and I went to a dinner party. Everybody ate pretty much the same thing. I was feeling a little upset in the stomach at night and I heard dad moaning and groaning. My phone rings and it was a friend asking if we were feeling ok, everyone else was getting ill and they were going to the hospital. Went out and raided my kefir stock. Divied out two portions for me and six for dad. We both purged as best we could. Then we took two portions of the kefir grains, he complained more about the taste than his upset stomach LOL.
I had him take the rest of his portions about a half hour to an hour apart. By now, I was feeling sick, but not as bad as he was, and nowhere near what everyone else was at. By the morning we both started feeling pretty decent considering, but still ill. Again nowhere near as violently ill as other people had become. After dad talked to my brother about how ill him and his wife got, dad asked me to start brewing some extra kefir for him too.
When my dog was still around she would stare at me in disgust until I put a few tablespoons of kefir on her kibble.
Im a huge curd nerd (cheese), and once I accidentally left kefir for too long and the curds started seperating from the whey. I strained out the curds, mixed in some chives and onion flakes, strung it up and hoped for the best. The single best cheese spread I've ever had and I continue to make it.
The dog would go crazy for the fermented whey which I also used as stocks in stews and 1:1 with beer for my crockpot roasts.
And my dad's next healthscreening showed MUCH better cholesterol levels as well which was enough to get him off his medication.
I cant sing enough praises about probiotic stuff.