Microbiome Labs RestorFlora PD is a targeted probiotic formula specifically designed for post-antibiotic microbiome restoration — using a clinically validated combination of Saccharomyces boulardii (a yeast probiotic uniquely resistant to antibiotics) and targeted Bacillus spore strains to begin rebuilding the gut microbiome ecosystem during and after antibiotic therapy. 21 capsules — corresponding to typical antibiotic course length.Saccharomyces boulardii is the only probiotic organism clinically proven to reduce antibiotic-associated diarrhea (AAD) and Clostridium difficile-associated diarrhea (CDAD) because it is a yeast — completely unaffected by antibacterial antibiotics. It produces a protease that inactivates the C. diff toxin A and B receptors, preventing C. diff from colonizing during the dysbiotic window that antibiotics create. Bacillus spore strains complement by beginning immediate colonization resistance and SCFA production as soon as antibiotic therapy is complete. The combination of yeast and spore probiotics addresses the critical post-antibiotic window when pathogenic bacteria like C. diff, SIBO organisms, and antibiotic-resistant bacteria attempt to dominate the newly vacated ecological niches. Microbiome Labs is a science-first probiotic and gut health supplement company founded by Dr. Kiran Krishnan, a research microbiologist, built around spore-based probiotic technology and clinical research on the human gut microbiome. Available at Beauty Riche with same-day shipping.