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.
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.
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 12 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 16 Sept 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 2026-09-16}
}
For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.