Although there are numerous claimed benefits of using probiotic supplements, such as maintaining gastrointestinal health, in part by lowering risk of and
severity of constipation or diarrhea, and improving immune health, including lower risk of and severity of acute upper respiratory tract infections, i.e., the common cold, such claims are not all supported by sufficient clinical evidence.
There are about a dozen studies that demonstrate that L. reuteri probiotic supplementation (typically around one billion CFU doses) reduces intestinal inflammation, reduces
constipation, and reduces the
severity and duration
of diarrheal diseases and unexplained abdominal pain in children.