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Diarrhea-predominant irritable bowel syndrome (IBS-D) is a multifactorial disorder involving gut-brain axis dysregulation, altered barrier integrity, microbial imbalance, and stress-related mechanisms, with limited nutritional strategies targeting these pathways. Tannin-rich extracts may exert barrier-protective, microbiota-modulating, and stress-related effects. In a prospective before-after pilo
