NutriDex

The Supplement Research Compendium
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Bacillus coagulans

Heyndrickxia coagulans (GBI-30 6086 / Unique IS-2)

Spore-forming probiotic with the strongest evidence for easing IBS abdominal pain and bloating

Moderate evidence 🦠Probiotics🛡️Gut & Immune

✚ Updated · How we grade evidence

Evidence tier
Moderate
Research weight
Citations
8 verified / 8
Classification
Probiotics
❝
What the evidence says. Several controlled trials; effects real but modest or context-dependent.

What is Bacillus coagulans?

Bacillus coagulans (Heyndrickxia coagulans (GBI-30 6086 / Unique IS-2)) is a probiotic strain used for eases ibs abdominal pain and bloating (gbi-30 6086 and unique is-2, 8-week rcts). NutriDex grades the human evidence as Moderate. For Bacillus (Heyndrickxia) coagulans, the best-supported indication is irritable bowel syndrome: multiple randomized, placebo-controlled trials of the GBI-30 6086 (BC30) and Unique IS-2 strains show significant reductions in abdominal pain, bloating, and overall symptom severity over 8 weeks, and a 2023 systematic review/meta-analysis of seven RCTs concluded B. coagulans meaningfully lowers IBS symptom severity with no serious adverse events. Network meta-analyses rank Unique IS-2 among the most effective probiotics for IBS abdominal pain (SUCRA ~92.6%). Heat-stable spores also survive gastric acid and germinate in the gut; GBI-30 has separate human trials supporting improved milk-protein amino-acid absorption and exercise-recovery, though these are smaller. Evidence is strain-specific and most robust for IBS rather than for the muscle/immune claims often marketed.

Purported Benefits

✓Eases IBS abdominal pain and bloating (GBI-30 6086 and Unique IS-2, 8-week RCTs)
✓Reduces overall IBS symptom severity, straining, urgency and gas (meta-analysis of 7 RCTs)
✓Improves abdominal pain and stool consistency in pediatric IBS (Unique IS-2, ages 4-12)
✓Lessens functional intestinal gas symptoms (GBI-30 6086)
✓Enhances amino-acid/leucine absorption when co-ingested with milk protein (GBI-30 6086)
✓May reduce exercise-induced muscle soreness and speed recovery alongside protein (GBI-30 6086, preliminary)

Evidence by outcome

The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.

OutcomeEvidenceEffectStudies
Eases IBS abdominal pain and bloatingSeveral 8-week RCTs (BC30, Unique IS-2) consistent, but strains differ and most trials are modest-sized. Moderate ↑ benefit · moderate 3
Reduces overall IBS symptom severity, straining, urgency, gas2023 meta-analysis of 7 RCTs found significant reductions with no serious adverse events. Moderate ↑ benefit · moderate 1
Improves pediatric IBS / functional abdominal painTwo pediatric RCTs (Unique IS-2) show reduced pain/improved stool, one as FOS synbiotic. Moderate ↑ benefit · moderate 3
Enhances amino-acid/leucine absorption with milk proteinSingle 2-week study (n=30) on GBI-30 6086; surrogate absorption endpoint, not strength/performance. Preliminary ↑ benefit · small 1
Reduces exercise-induced muscle soreness / speeds recoveryOne small crossover RCT (n=29) with protein; preliminary and perceived-recovery based. Preliminary ↑ benefit · small 1

Dosing & Compounds

Typical Dose
For IBS: ~2 billion CFU/day of Unique IS-2 or 1 billion CFU/day of GBI-30 6086, once daily for 8 weeks (effect builds over weeks 2-8). For protein/recovery use: 1 billion CFU GBI-30 6086 co-ingested with protein. Spores are acid-stable and can be taken with or without food.
Active Compounds
Bacillus coagulans GBI-30, 6086 (BC30, branded by Kerry)Bacillus coagulans Unique IS-2 (MTCC 5260; Unique Biotech)Bacillus coagulans MTCC 5856 (LactoSpore/Sabinsa, IBS evidence)Heat-stable spore tablets, capsules and chewables; shelf-stable, no refrigerationCommonly 1-2 billion CFU per serving; reclassified taxonomically as Heyndrickxia coagulans

Safety & Cautions

Generally very well tolerated in trials with no serious adverse events and adverse-event rates similar to placebo in both adults and children; GRAS-status spore former. As with any live probiotic, use caution in critically ill, immunocompromised, or central-venous-catheter patients, where rare bacteremia/translocation is a theoretical concern; consult a clinician in these settings and in pregnancy. Educational only — always check with your doctor or pharmacist before combining Bacillus coagulans with any medicine.

Key Studies

systematic review/meta-analysis Abhari 2023 (B. coagulans IBS meta-analysis) ✓ Source
Systematic review and meta-analysis of seven RCTs found B. coagulans significantly lowered abdominal pain (after 2, 4, 8 and 11-13 weeks), bloating, straining, gas and total symptom severity, with no serious adverse events.
RCT Madempudi 2019 ✓ Full text
Randomized placebo-controlled trial (136 adults, Rome III IBS) of Unique IS-2 (2 billion CFU/day, 8 weeks) showed significant improvement in abdominal pain intensity and complete spontaneous bowel movements vs placebo.
RCT Madempudi 2018 ✓ PubMed
Double-blind RCT in 141 children (ages 4-12, Rome III IBS): Unique IS-2 chewable once daily for 8 weeks significantly reduced pain intensity (P<0.0001) and improved stool consistency, bloating and urgency vs placebo.
RCT Jäger 2016 ✓ Full text
Crossover RCT in 29 trained males: 1 billion CFU GBI-30 6086 added to casein significantly improved perceived recovery at 24 and 72 h and reduced muscle soreness at 72 h post-exercise vs protein alone.
RCT Jäger 2018 (protein absorption) ✓ Full text
Two-week supplementation study (n=30) found adding GBI-30 6086 to milk protein concentrate improved amino-acid absorption, including ~20% greater leucine absorption.
RCT Saneian 2015 ✓ Full text
RCT in 115 children (6-18 y) with functional abdominal pain: synbiotic of B. coagulans Unique IS-2 plus FOS twice daily for 4 weeks gave a higher response rate than placebo (60% vs 39.5%, P=0.044).
RCT Hun 2009 ✓ PubMed
In a randomized, double-blind, placebo-controlled trial (n=44), B. coagulans GBI-30 6086 once daily for 8 weeks gave statistically significant improvements in abdominal pain and bloating scores vs placebo across all 7 weekly comparisons (P<0.01).
RCT Dolin 2009 ✓ Full text
Randomized, double-blind, placebo-controlled dual-site trial of a GBI-30 6086-based product showed significant reduction in functional intestinal gas symptoms vs placebo.
8 sources cited · 8 verified Search all studies on PubMed ↗

Common questions about Bacillus coagulans

What is Bacillus coagulans used for?

Bacillus coagulans is most often taken for Eases IBS abdominal pain and bloating (GBI-30 6086 and Unique IS-2, 8-week RCTs), Reduces overall IBS symptom severity, straining, urgency and gas (meta-analysis of 7 RCTs), Improves abdominal pain and stool consistency in pediatric IBS (Unique IS-2, ages 4-12), Lessens functional intestinal gas symptoms (GBI-30 6086). Spore-forming probiotic with the strongest evidence for easing IBS abdominal pain and bloating

Does Bacillus coagulans work — what does the evidence say?

Moderate evidence. Several controlled trials; effects real but modest or context-dependent. For Bacillus (Heyndrickxia) coagulans, the best-supported indication is irritable bowel syndrome: multiple randomized, placebo-controlled trials of the GBI-30 6086 (BC30) and Unique IS-2 strains show significant reductions in abdominal pain, bloating, and overall symptom severity over 8 weeks, and a 2023 systematic review/meta-analysis of seven RCTs concluded B. coagulans meaningfully lowers IBS symptom severity with no serious adverse events. Network meta-analyses rank Unique IS-2 among the most effective probiotics for IBS abdominal pain (SUCRA ~92.6%). Heat-stable spores also survive gastric acid and germinate in the gut; GBI-30 has separate human trials supporting improved milk-protein amino-acid absorption and exercise-recovery, though these are smaller. Evidence is strain-specific and most robust for IBS rather than for the muscle/immune claims often marketed.

What is the typical dose of Bacillus coagulans?

For IBS: ~2 billion CFU/day of Unique IS-2 or 1 billion CFU/day of GBI-30 6086, once daily for 8 weeks (effect builds over weeks 2-8). For protein/recovery use: 1 billion CFU GBI-30 6086 co-ingested with protein. Spores are acid-stable and can be taken with or without food.

Is Bacillus coagulans safe? Any cautions or side effects?

Generally very well tolerated in trials with no serious adverse events and adverse-event rates similar to placebo in both adults and children; GRAS-status spore former. As with any live probiotic, use caution in critically ill, immunocompromised, or central-venous-catheter patients, where rare bacteremia/translocation is a theoretical concern; consult a clinician in these settings and in pregnancy.

How many studies support Bacillus coagulans?

NutriDex cites 8 sources for Bacillus coagulans, graded "Moderate".

Cite this page
APA

Peh, D. (2026). Bacillus coagulans (Heyndrickxia coagulans (GBI-30 6086 / Unique IS-2)): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/bacillus-coagulans

BibTeX
@misc{nutridex_bacillus_coagulans,
  author       = {Peh, Daryl},
  title        = {Bacillus coagulans (Heyndrickxia coagulans (GBI-30 6086 / Unique IS-2)): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/bacillus-coagulans},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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