Lactobacilli are commensal bacteria common to the gut of all mammals studied and traditionally associated with foods are considered safe.The established safe use on a diversity of foods and supplement products worldwide supports this conclusion. Lactobacillus reuteri is one species of Lactobacillus that naturally inhabits the gastrointestinal tract of humans and is one of the few autochthonous (indigenous) Lactobacillus species in infants as well as adults.