Probiotics, live microorganisms that aid in digestion and immunity, are found in various foods. Greek yogurt, kefir, kombucha ...
In addition to these foods, you might also try probiotic supplements. Look for labeling that reads, "contains live cultures" or "contains active cultures" in these common probiotic foods.
Kombuchas should have plenty of sediment and fizz. Foods labels that say "live active cultures" or "live probiotics" are generally a good sign, Bulsiewicz said. If you want to starve the bad ...