Multistrain probiotics lowered IBS symptom scores, with substantial uncertainty
A pooled analysis favored probiotics over placebo for overall symptom severity, while abdominal pain scores and IBS-specific quality of life did not improve significantly.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
The review found lower overall IBS symptom severity scores with multistrain probiotics than with placebo. Results varied greatly across studies, and some outcomes showed no statistically significant improvement. This abstract-based summary therefore supports a possible symptom benefit while leaving uncertainty about its consistency, its practical size and which probiotic mixtures contributed.
The abstract reports very high variation between studies but does not explain which factors accounted for it. It also omits treatment durations, strain combinations and whether the average score difference was clinically meaningful.
What researchers found
Mean difference in total IBS symptom severity score
Probiotics versus placebo; 95% confidence interval: -65.89 to -21.44. Treatment duration is not reported in the abstract.
What the score captures
The main measure was the IBS symptom severity score, which summarizes several symptom domains. A lower total score favored probiotics, but the reported average does not show whether every individual symptom changed.
Why separate outcomes matter
Several symptom subscores improved, including bloating and bowel habit satisfaction. The quality-of-life subscore also improved, while the separate IBS-specific quality-of-life measure did not show a statistically significant change. These are distinct reported outcomes.
The original publication
Effect of multistrain probiotics on symptom severity in irritable bowel syndrome: a systematic review and meta-analysis of irritable bowel syndrome-symptom severity score outcomes.
Anwar DFF, Salma ZN, Oktaviani SD et al.
Eur J Gastroenterol Hepatol · 2026
- PubMed ID
- 41433106
- Record checked
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