Each probiotic "contains a specific dose and strain of bacteria. Products most commonly include members of the Lactibacillus and Bifidobacterium groups of bacteria."
Get a doctor's recommendation on products and suppliers.
"Studies suggest that probiotics are effective in treating diarrhea, preventing relapse in diarrhea associated with antibiotic use..."

"Some claims for these products are not yet supported by research."

"See March issue of Mayo Clinic Women's HealthSource, covers what is known about probiotics auch as yogurt, miso and some juices, and what remains uncertain."
www.mayoclinic.org

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