Maybe try kefir?
They say a lot of the good of kefir doesn’t survive the stomach and reach the gut. Kimchi is better and tastes about as bad. ;)
Also, there’s saccharomyces boulardii, ie brewer’s yeast. It’s in a few otc brands...Florastor is one. Supposedly it survives stomach acid. Tastes nasty.
Apples, quercetin, zinc, vit C and D, and get offa the sofa!
https://en.wikipedia.org/wiki/Kefir
I am not finding anything within that page about benefits or such.