Bacillus coagulans and Improved Bowel Movement Frequency

Research synthesisModerate evidenceMixed effect size4 studies · 3 beneficial · 1 neutral · 0 harmful

Across 4 studies, 3 reported beneficial effects on bowel movement frequency, with predominant effect sizes ranging from small to moderate. The most robust evidence comes from a systematic review (moderate effect, significant) and an RCT in healthy adults with mild intermittent constipation (small effect, significant). The median study duration was 56 days, with effects observed in clinical populations (chronic constipation and IBS).

Studied populations: adults with chronic constipation, adults with irritable bowel syndrome (IBS), healthy adults with mild intermittent constipation

Caveats: Available evidence is overwhelmingly positive (3 of 4 studies beneficial) — clinical literature in this area is subject to publication bias (null-result studies are less likely to be published or indexed). The evidence base is small (only 4 studies) — conclusions should be considered preliminary. One RCT (with inulin form) found neutral effects on bowel movement frequency, though other constipation-related outcomes improved; this suggests the form (with inulin) or population (IBS) may moderate results.

Generated Jun 25, 2026

Doses used in studies

With Inulin · spores/day: 1 billion (median 1 billion, IQR 1 billion–1 billion) — 1 study

Time to effect

Median: 8 weeks · IQR 8 weeks–8 weeks · Range 8 weeks–8 weeks — Reported in 1 of 4 studies

Safety in these studies

Overall tolerabilityReported
In terms of safety, there were no statistically significant differences between the intervention and control groups in all adverse event analyses.
from: Network meta-analysis of probiotics, prebiotics, and synbiotics for the treatment of chron
Overall tolerabilityReported
toxicological experiments and a large number of clinical observations have showed that B. coagulans is safe and has no effect of mutagenicity, teratogenicity or genotoxicity
from: Bacillus coagulans and its applications in medicine.

4 of 4 papersPopulation:

Network meta-analysis of probiotics, prebiotics, and synbiotics for the treatment of chronic constipation in adults.
- 2024-05-02
- Systematic Review · n = 903
- European journal of nutrition 63(6)
- - Xinxin Deng
  - Cui Liang
  - Liying Zhou
  - Xue Shang
  - Xu Hui
  - Liangying Hou
  - Yongsheng Wang
  - Wendi Liu
  - Shanshan Liang
  - Liang Yao
  - Kehu Yang
  - Xiuxia Li
- PubMed: 38693449
- DOI: 10.1007/s00394-024-03410-1
3 Insights on
- Improved Bowel Movement Frequency
- High evidence
- Rigorous Journal
- Clinical
mix7 (consisting of Lactulose, Bifidobacterium subtilis, and Enterococcus faecium) (MD = 4.58, 95% CI [1.35, 7.78], moderate certainty) exhibited a significant effect
Effect
Beneficial
Effect size
Moderate
Significant
Yes
Is Bacillus coagulans supplementation plus low FODMAP diet superior to low FODMAP diet in irritable bowel syndrome management?
- 2019-07-20
- RCT
- European journal of nutrition 59(5)
- - Khadijeh Abhari
  - Saeede Saadati
  - Fatemeh Hosseini-Oskouiee
  - Zahra Yari
  - Hedayat Hosseini
  - Golbon Sohrab
  - Ehsan Hejazi
  - Shahram Agah
  - Amir Sadeghi
  - Azita Hekmatdoost
- PubMed: 31327047
- DOI: 10.1007/s00394-019-02060-y
7 Insights on
- Improved Bowel Movement Frequency
- High evidence
- Rigorous Journal
- Clinical
Significant improvements were observed in abdominal pain intensity and frequency, abdominal distension, satisfaction with bowel habits, quality of life, defecation consistency, and patient-reported severity score in both groups; however, only improvement in severity score was significantly higher in probiotic group compared with placebo group (P = 0.001).
Effect
Neutral
Effect size
Small
Significant
No
Dose
10^9 spores/day plus 400 mg inulin
Spore-forming Bacillus coagulans SNZ 1969 improved intestinal motility and constipation perception mediated by microbial alterations in healthy adults with mild intermittent constipation: A randomized controlled trial.
- 2021-08
- RCT · n = 80
- Food Research International 146
- - Seunghee Kang
  - M. Park
  - I. Brooks
  - Jaekyung Lee
  - S. Kim
  - Ji Yeon Kim
  - Bumjo Oh
  - Ji Won Kim
  - O. Kwon
- PubMed: 34119240
- DOI: 10.1016/j.foodres.2021.110428
10 Insights on
- Improved Bowel Movement Frequency
- High evidence
- Clinical
CSBM at weeks 2 (p = 0.045) and 9 (p = 0.038)
Effect
Beneficial
Effect size
Small
Significant
Yes
Bacillus coagulans and its applications in medicine.
- 2019-07-10
- Review
- Beneficial microbes 10(6)
- - Y Mu
  - Y Cong
- PubMed: 31203635
- DOI: 10.3920/bm2019.0016
5 Insights on
- Improved Bowel Movement Frequency
- Moderate evidence
- Rigorous Journal
Recent studies have shown that B. coagulans has therapeutic effects on intestinal diseases, such as acute diarrhoea, irritable bowel syndrome, antibiotic-related diarrhoea, constipation and colitis via modulation of the microbiota composition, host immunity and metabolism.
Effect
Beneficial
Effect size
Small
Significant
Yes

Bacillus coagulans and Improved Bowel Movement Frequency

Network meta-analysis of probiotics, prebiotics, and synbiotics for the treatment of chronic constipation in adults.

Is Bacillus coagulans supplementation plus low FODMAP diet superior to low FODMAP diet in irritable bowel syndrome management?

Spore-forming Bacillus coagulans SNZ 1969 improved intestinal motility and constipation perception mediated by microbial alterations in healthy adults with mild intermittent constipation: A randomized controlled trial.

Bacillus coagulans and its applications in medicine.