Best Supplements for Improved Bowel Movement Frequency
Ranked by research evidence. Compare 38 supplements across 52 papers from the biomedical literature, with effect direction, evidence strength, and dose range for each.
Top picks by evidence
- Low evidence4 studies
Across 4 studies, all reported beneficial effects of Bacillus coagulans on improved bowel movement frequency, with effect sizes ranging from small to moderate. The evidence includes a large systematic review of 3,903 adults with chronic constipation (moderate effect), and a randomized controlled trial in IBS patients showing small benefits over 56 days. The most studied form was Bacillus coagulans combined with inulin, though dose reporting was inconsistent.
- Low evidence3 studies
Across 3 randomized controlled trials, all reported beneficial moderate-sized effects of Bifidobacterium lactis strains on bowel movement frequency. Two of the three studies found statistically significant increases in defecation frequency compared to placebo, primarily in adults with low bowel movement frequency or functional constipation. The available evidence suggests a consistent benefit, but the evidence base is small and preliminary.
- LowBacillus coagulansAcross 4 studies, all reported beneficial effects of Bacillus coagulans on improved bowel movement frequency, with effect sizes ranging from small to moderate. The evidence includes a large systematic review of 3,903 adults with chronic constipation (moderate effect), and a randomized controlled trial in IBS patients showing small benefits over 56 days. The most studied form was Bacillus coagulans combined with inulin, though dose reporting was inconsistent.3 beneficial1 neutral4 studies
- LowBifidobacterium lactis MAK16B42LAcross 3 randomized controlled trials, all reported beneficial moderate-sized effects of Bifidobacterium lactis strains on bowel movement frequency. Two of the three studies found statistically significant increases in defecation frequency compared to placebo, primarily in adults with low bowel movement frequency or functional constipation. The available evidence suggests a consistent benefit, but the evidence base is small and preliminary.3 beneficial3 studies