This 2020 NCBI meta-analysis takes a close look at prebiotics which play a role in augmenting the presence of gut microbiota such as Bifidobacterium, Clostridium, Bacteroidetes, and Lactobacilli which have been demonstrated in functional gastrointestinal disorders. There are only a few studies of the efficacy of prebiotics for chronic constipation and the utility of different commercially available prebiotics in patients with functional and chronic idiopathic constipation. 21 randomized controlled trials were reviewed showing prebiotics to be effective treatments for chronic idiopathic constipation; improvement in stool consistency; the number of bowel moments, and bloating.

Source: Therapeutic Effects of Prebiotics in Constipation: A Review – PubMed