Best Supplements for Improved Gastrointestinal Health
Ranked by research evidence. Compare 42 supplements across 69 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Low evidence10 studies
Across 10 studies, 10 reported beneficial effects of Lactobacillus salivarius UCC118 on gastrointestinal health, with effect sizes ranging from small to moderate. No studies reported neutral or harmful findings. The evidence consists entirely of review articles and case reports, with no human trials reporting specific effect sizes or statistical significance. Doses and study durations were not reported consistently.
- Low evidence3 studies
Across 3 studies (all narrative reviews), all reported beneficial effects on gastrointestinal health, with effect sizes ranging from small to large (one large, one moderate, one small). No statistically significant results were reported, and no specific dose, form, duration, or population data were available. The evidence consistently supports a beneficial direction, but the lack of significant findings and small evidence base limits confidence.
- Very low evidence7 studies
Across 7 review studies, all reported beneficial effects of kefir culture on gastrointestinal health, with effect sizes ranging from small to moderate. The evidence is drawn entirely from narrative reviews, with no primary study details (doses, durations, populations) reported, limiting specificity. No meta-analyses or original RCTs were included, so the aggregate conclusion is that qualitative reviews consistently indicate benefit for gastrointestinal health (e.g., improved bowel function, reduced discomfort, support against H. pylori and lactose malabsorption).
- LowLactobacillus salivarius UCC118Across 10 studies, 10 reported beneficial effects of Lactobacillus salivarius UCC118 on gastrointestinal health, with effect sizes ranging from small to moderate. No studies reported neutral or harmful findings. The evidence consists entirely of review articles and case reports, with no human trials reporting specific effect sizes or statistical significance. Doses and study durations were not reported consistently.10 beneficial10 studies
- Very lowKefir CultureAcross 7 review studies, all reported beneficial effects of kefir culture on gastrointestinal health, with effect sizes ranging from small to moderate. The evidence is drawn entirely from narrative reviews, with no primary study details (doses, durations, populations) reported, limiting specificity. No meta-analyses or original RCTs were included, so the aggregate conclusion is that qualitative reviews consistently indicate benefit for gastrointestinal health (e.g., improved bowel function, reduced discomfort, support against H. pylori and lactose malabsorption).7 beneficial7 studies
- LowBifidobacterium animalis subsp. lactis BB-12Across 3 studies (all narrative reviews), all reported beneficial effects on gastrointestinal health, with effect sizes ranging from small to large (one large, one moderate, one small). No statistically significant results were reported, and no specific dose, form, duration, or population data were available. The evidence consistently supports a beneficial direction, but the lack of significant findings and small evidence base limits confidence.3 beneficial3 studies
- Very lowBacillus clausii SC-109Across 3 studies, all reported beneficial moderate-sized effects of Bacillus clausii SC-109 on gastrointestinal health. However, the evidence base is limited to reviews without reported sample sizes, statistical significance, or consistent study durations, and one study focused on domestic cats rather than humans.3 beneficial3 studies
- Very lowBifidobacterium plantarumAcross 3 studies, all reported small beneficial effects of Bifidobacterium plantarum for improved gastrointestinal health. The evidence base is very small and consists entirely of review articles without extractable dose, form, or population data. No statistically significant findings were reported in the included reviews.3 beneficial3 studies
- Very lowLactobacillus rhamnosusAcross 3 studies, all reported beneficial moderate-sized effects of Lactobacillus rhamnosus on gastrointestinal health. The evidence base is very small and preliminary, with no studies providing statistical significance data. Most formulations, doses, and study durations were not reported.3 beneficial3 studies