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SCORE
Soil-based organisms (SBO probiotics)
Gut · Shelf-stable · IBS
Tier 3 — Trending
What it is
Spore-forming bacteria from soil including Bacillus subtilis, B. clausii, and B. licheniformis. Spores survive stomach acid without refrigeration. B. clausii is prescription-strength in some European countries for diarrhoea. However, some SBO products contain poorly characterised strains with limited safety data. Choose products with well-studied, named strains.
Efficacy
2/5
Safety
3/5
Research
2/5
Onset
3/5
Cost
3/5
Drug-int.
4/5
Dose
1–5 billion CFU/day; choose products with named, studied strains (B. clausii, B. subtilis HU58)
Time of day & tips
Can be taken without refrigeration — stable at room temperature. Take with or without food. Only choose products with clearly named, researched strains.
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