Whatever the benefits of supplements, they have not been our source of probiotics for most of our history. Instead, pretty much every traditional cuisine included fermented foods teeming with good bacteria. You should follow tradition here if you want to promote the health of the ecosystem in your G/I tract. Sauerkraut, kimchi, pickles, tofu, kombucha, unfiltered apple cider vinegar, yogurt, and kefir are all good sources (though watch the sugar with yogurt and kefir products). Just make sure you get the stuff that is really fermented. Some pickled vegetables and most tofu are merely soaked in
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