Lactobacillus rhamnosus GG Lactobacillus rhamnosus GG, sometimes called LRGG by different probiotic brands, is a well-known and extensively studied probiotic strain. It belongs to the Lactobacillus rhamnosus species. It’s important to note that the LRGG and the regular Lactobacillus rhamnosus strains are genetically identical. This probiotic has been the focus of more than 250 clinical trials, with around 40 specifically involving children. According to clinicaltrials.gov, it holds the rec...