Little difference: Probiotics have had a lot of good press in recent years, but scientific proof behind them is weak. Yogurt or kefir probably will have no effect; the bacteria in them do not survive in human intestines. None of these will do any harm, so use whatever works best for you. Even without probiotics, normal bacteria will repopulate your intestines naturally in a few weeks, with no special treatment.
Answered 12/24/2018
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