A probiotic is a live beneficial bacterium that has adapted to survive in the human digestive system. In turn, it provides a health benefit to that person. By definition, to be a true probiotic, it has to be an organism that has evolved to become exposed to a human host through consumption (typically via the food supply); have the capability to naturally survive the harsh environment of the stomach, and have the ability to effectively colonize in the intestines where it provides health benefits. Any bacterium that is unable to naturally survive the harsh environment of the stomach and upper digestive system cannot be a true probiotic.
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