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the array of conditions for which probiotic therapy has been found to have some documented and quantifiable measure of success is quite staggering. Probiotics have been most definitively linked to treating and preventing diseases of the digestive tract, such as diarrhea (including that caused by antibiotics, rotavirus, and HIV34), inflammatory bowel disease35, irritable bowel syndrome36, constipation37, and even colon cancer.38 They have shown efficacy in treating vaginal infections.39 Probiotics have been found to reduce incidence and duration of common colds40 and upper respiratory symptoms41 and to reduce absences from work.42 They have been shown to improve outcomes and prevent infections
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Sandor Ellix Katz (The Art of Fermentation: An In-Depth Exploration of Essential Concepts and Processes from Around the World)