Help for choosing probiotics

DEAR DR. GOTT: In a recent column in the Monterey County (Calif.) Herald, you suggested a woman try an array of products, including probiotics that might help her overcome flatulence. Would you be kind enough to write a column explaining the uses of probiotics, including the way in which a person would select the appropriate product?

The quantity and range of these products is dizzying and confusing, and the “expertise” is limited, at best. Doctors and other practitioners seldom (in my experience) specify what sort of probiotics to buy and merely suggest that we go to a good health-food store. That is not helpful.
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