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After examining the first 150 websites turned up by a Google search, researchers concluded that the vast majority were run by companies advertising products or news outlets that offered incomplete information, often leaving out potential side effects, according to the report in Frontiers in Medicine.

“This study demonstrates that a number of online claims on the health benefits of probiotics are not supported by scientific evidence,” said coauthor Michel Goldman, a professor of immunology at the Universite Libre de Bruxelles, in Belgium, and chief editor of Frontiers in Medicine. “(For example,) online claims on the beneficial effects of probiotics in cancer are not supported by any evidence.”