About Bacillus clausii
A spore-forming probiotic (recently reclassified as Alkalihalobacillus/Heyndrickxia clausii). The Enterogermina strains have RCTs and meta-analytic support for acute and antibiotic-associated diarrhea, especially in children; CSI08 and AO1125 have supportive GI/safety RCT data. Strain-specific.
What Bacillus clausii supports
- Moderate evidence for diarrhea, including antibiotic-associated
- Spore form is acid- and shelf-stable
How much Bacillus clausii to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
1–6
billion_cfu
Enterogermina RCTs use ~2-6 billion spores/day. Often presence-only in blends; nominal range.
Clinical evidence
Moderate clinical evidence. Moderate: RCT/meta-analytic support for diarrhea (specific strains).
NIH Fact Sheet