| Summary: | Probiotic products typically take the form of oral supplements or food-based products containing microorganisms, typically bacteria. The number of bacteria present in a dose of probiotic can be several orders of magnitude lower than the label claims, and in some cases, undetectable. The objective of this study was to assess probiotic products containing <i>Escherichia coli</i> to verify manufacturer claims, which have not yet been independently assessed, regarding the number of viable <i>E. coli</i> per suggested dose. It was found that the products tested contained <i>E. coli</i> in numbers several orders of magnitude less than claimed, and when subjected to simulated stomach conditions, the number of viable <i>E. coli</i> was significantly reduced.
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