Supplementary Materials. Figure S1 to Figure S17: Forest Plot of the estimated effect of postbiotic administration (difference from the control group) for every parameter studies in the meta-analysis (fecal score; fecal pH; fe-cal concentration of acetate, propionate, butyrate, isobutyrate, isovalerate, valerate, indole, and phenol; richness; Shannon Index, and relative abundance of Fusobacteria, Firmicutes, Actinobac-teria, Bacteroidetes, and Proteobacteria phyla).