Best Supplements for Improved Gut Microbiota Composition
Ranked by research evidence. Compare 72 supplements across 105 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Low evidence5 studies
Across 3 studies, all reported beneficial effects of Bifidobacterium animalis subsp. lactis BB-12 on gut microbiota composition, with effect sizes ranging from small to moderate. One study in mice with acute pancreatitis found a statistically significant increase in beneficial Ligilactobacillus and decrease in potentially harmful Bilophila. The evidence base is too small to determine a predominant dose range or population effect.
- Low evidence4 studies
Across 3 studies, all reported beneficial effects on gut microbiota composition, with effect sizes classified as moderate (2 studies) or small (1 study). The evidence base is small and preliminary, with no statistically significant findings reported and no consistent dose, duration, form, or population data available.
- Very low evidence6 studies
Across 3 studies, all reported beneficial effects on gut microbiota composition, with effect sizes ranging from small to moderate. No studies reported neutral or harmful outcomes, though none reached statistical significance. The evidence is preliminary and limited to small samples and review-level analyses, with one systematic review in adults with alcoholic liver disease (n=12) showing moderate beneficial effects on gut microbiota composition.
- Very lowBifidobacterium plantarumAcross 3 studies, all reported beneficial effects on gut microbiota composition, with effect sizes ranging from small to moderate. No studies reported neutral or harmful outcomes, though none reached statistical significance. The evidence is preliminary and limited to small samples and review-level analyses, with one systematic review in adults with alcoholic liver disease (n=12) showing moderate beneficial effects on gut microbiota composition.6 beneficial6 studies
- LowBifidobacterium animalis subsp. lactis BB-12Across 3 studies, all reported beneficial effects of Bifidobacterium animalis subsp. lactis BB-12 on gut microbiota composition, with effect sizes ranging from small to moderate. One study in mice with acute pancreatitis found a statistically significant increase in beneficial Ligilactobacillus and decrease in potentially harmful Bilophila. The evidence base is too small to determine a predominant dose range or population effect.5 beneficial5 studies
- LowLactobacillus rhamnosusAcross 3 studies, all reported beneficial effects on gut microbiota composition, with effect sizes classified as moderate (2 studies) or small (1 study). The evidence base is small and preliminary, with no statistically significant findings reported and no consistent dose, duration, form, or population data available.4 beneficial4 studies
- Very lowBifidobacterium bifidum Bb-02Across 3 studies, all reported beneficial effects of Bifidobacterium bifidum Bb-02 on gut microbiota composition, with effect sizes ranging from small to moderate. The only statistically significant finding (p<0.05) showed moderate beneficial effects in an atopic dermatitis mouse model. Evidence is very limited — no dose, duration, or consistent population data are available.3 beneficial3 studies