S. boulardii is a probiotic YEAST (not bacteria) with the strongest clinical evidence of any probiotic for diarrhea prevention and treatment. A Cochrane review found it reduces antibiotic-associated diarrhea (AAD) risk by 53%. Our research highlights its unique advantage: as a yeast, it is COMPLETELY RESISTANT to all antibiotics — making it the only probiotic that works WHILE you're taking antibiotics. It also has the most rigorous evidence for C. difficile infection prevention (reducing recurrence by 50%) and acute infectious diarrhea in children (reducing duration by 1 day).
S. boulardii has four distinct mechanisms: (1) it secretes proteases that directly destroy C. difficile toxins A and B and their intestinal receptors; (2) it produces anti-inflammatory signals (via NF-κB modulation) that reduce intestinal inflammation; (3) it strengthens tight junctions between intestinal epithelial cells, improving barrier function; (4) it stimulates secretory IgA production, enhancing mucosal immunity. As a yeast (not bacteria), it's unaffected by antibiotics — the antibiotics kill pathogenic bacteria while S. boulardii simultaneously restores intestinal ecology and protects against opportunistic infections like C. difficile.
Reviewed by the Scan Dose Research Team and Clinical Advisory Board | Last updated:
Not medical advice. Based on published clinical research and systematic reviews.