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GLP-1 and the Gut Microbiome: A Bidirectional Story The relevance of probiotics during GLP-1 use is grounded in real biology that goes beyond just "gut health." A 2026 narrative review in the British Journal of Clinical Pharmacology examined the bidirectional relationship between GLP-1 RAs and the gut microbiome.[4] The review documents that: GLP-1 RAs themselves modify gut microbial composition, with several studies showing shifts in the Firmicutes/Bacteroidetes ratio and increased abundance of certain Bifidobacterium and Lactobacillus species during treatment The gut microbiome in turn produces metabolites (short-chain fatty acids, secondary bile acids) that stimulate endogenous GLP-1 secretion Microbiome composition may influence inter-individual response to GLP-1 therapy through inflammation, insulin sensitivity, and metabolic pathways The implication for probiotic supplementation: the period during GLP-1 use is one of meaningful microbial change driven by altered transit, reduced food intake, and direct drug effects