Bacillus coagulans
Also known as: B. coagulans, Heyndrickxia coagulans, BC30, GBI-30 6086, Unique IS2, spore-forming probiotic
Effective Dosage
1–2 billion CFU daily based on study doses
What the Science Says
Bacillus coagulans is a spore-forming probiotic bacterium, meaning it survives stomach acid better than many other probiotics. Clinical trials show it reliably improves bowel movement frequency, stool consistency, and reduces constipation in adults with functional gut complaints. Benefits typically appear within 4 weeks at doses of 1–2 billion CFU per day, and it is generally well tolerated with few side effects.
What It Doesn't Do
Won't cure IBS or any diagnosed gut disease on its own. No solid evidence it meaningfully reshapes your entire gut microbiome. Not proven to treat Parkinson's disease, Long COVID, or cancer-related gut damage in humans — those findings are from animal studies only. The UTI study used it as part of a multi-ingredient blend, so you can't credit B. coagulans alone for those results. No evidence it improves mental health or reduces stress.
Evidence-Based Benefits
Bacillus coagulans is a probiotic strain that has been shown to support gut health by improving digestion and enhancing the balance of gut microbiota. It may also help alleviate symptoms of irritable bowel syndrome (IBS) and reduce gastrointestinal discomfort.
Strong EvidenceEffective at: 1-5 billion CFU daily
Source: auto-research
Absorption & Bioavailability
Good — spore-forming nature allows survival through stomach acid and bile, reaching the intestine intact. This is a key advantage over non-spore-forming probiotics.
Red Flags to Watch For
- Many products don't specify the strain (e.g., BC30, Unique IS2) — strain identity matters and generic 'B. coagulans' labels may not match studied strains
- Several promising uses (Parkinson's disease, radiation protection, cancer drug side effects) are based only on animal studies — do not interpret these as human benefits
- The UTI study tested B. coagulans as part of a multi-ingredient supplement (D-mannose, propolis, hyaluronic acid, etc.) — impossible to isolate its individual contribution
- CFU counts on labels may not reflect viable bacteria at time of consumption — look for products with third-party testing or guaranteed-at-expiry claims
- Short study durations (mostly 4 weeks) mean long-term safety and sustained benefit are not well established from the provided data
Products Containing Bacillus coagulans
See how Bacillus coagulans is used in these analyzed products:
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-04-06