Quick answer
"Probiotics" is too broad to be useful. Effects are strain-specific and context-specific. Pick strains based on symptom pattern, not branding claims.
Core categories
- Lactobacillus: often used for upper-GI comfort support.
- Bifidobacterium: often used for lower-GI and bowel pattern support.
- S. boulardii: beneficial yeast used in specific recovery contexts.
Bottom line
Precision beats stacking. Use one clear product, run a controlled trial, keep what works.