The short answer. There isn't much data on Lactobacillus yet — 4 mentions, 0 with a clear outcome — so treat these numbers as anecdotal. It is well studied — 762 meta-analyses on PubMed.
From 4 mentions in total — the rest didn't say how it went and aren't counted.
Of the people who reported each effect, the share who said it got better.
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
3+ meta-analyses or systematic reviews and 10+ randomized controlled trials in humans. The grade measures how much human research exists — read the conclusions below for what it found.
Conclusion: Probiotics are effective for preventing AAD. Secondary analyses of higher dosages and certain species have shown increased effectiveness. Our results may not be applicable in clinical scenarios of lower baseline AAD risk.
PubMed 34385227 ↗Conclusion: In short, probiotics and FMT are effective for managing IBS, with Bifidobacterium and Lactobacillus being dominant strains. However, the most effective probiotic combination or strain remains unclear, while prebiotics and synbiotics did not show significant improvement.
PubMed 38999862 ↗Conclusion: The present work revealed that probiotics could improve intestinal barrier function, and alleviate inflammation and microbial dysbiosis. Further high-quality RCTs are warranted to achieve a more definitive conclusion.
PubMed 37168869 ↗Conclusion: Antibiotic exposure was associated with reduced microbiome diversity and richness, and with changes in bacterial abundance. The potential for dysbiosis in the microbiome should be taken into account when prescribing antibiotics for children.Systematic review registration number: CRD42018094188.
PubMed 33651651 ↗As stated by users — not a recommendation. Follow the label or your doctor.
How often each side effect came up across all reports.
First-hand experiences, quoted verbatim. We show one positive and one negative where both exist.
User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 3, 2026. How we rate