Subtotal $0.00
Shop Now
Bacillus coagulans is a lactic acid-producing bacterium that forms spores, which lets it survive heat, drying and stomach acid better than many other probiotics. It is sold in capsules, gummies and foods, including several fiber gummies we carry. The research is strain-specific: a few branded strains have small randomized trials, often run by the companies that make them, and the FDA has issued “no questions” letters on the safety of some strains as food ingredients, which is not an approval of any health use. This guide covers what B. coagulans is, its new scientific name, what studies found, safety, and two related topics: Clostridium butyricum and butyrate supplements.
Peptide Labs sells probiotic supplements, and we mention three below. This article is general information, not medical advice.
Key Takeaways
- Bacillus coagulans forms spores, so it tolerates heat and acid in lab tests better than many probiotics.
- Scientists renamed it Weizmannia coagulans in 2020 and Heyndrickxia coagulans in 2023; labels still use the old name.
- Evidence belongs to specific strains such as GBI-30, 6086, Unique IS2 and MTCC 5856, mostly from small trials.
- Gas and upset stomach are the usual side effects; people with weak immune systems should ask a doctor first.
- Clostridium butyricum is a different spore former that makes butyrate; rare bloodstream infections have been reported.
What is Bacillus coagulans?
B. coagulans is a rod-shaped bacterium that makes lactic acid, which is why it was long confused with lactobacilli. Some products still call it “Lactobacillus sporogenes”, a name the Natural Medicines database describes as a misidentification. Unlike lactobacilli and bifidobacteria, it forms spores: dormant, tough-coated cells that can wake up (germinate) when conditions are right.
Its official name has also changed. Genome studies moved it to a new genus, Weizmannia, in 2020, and then to Heyndrickxia in 2023. The List of Prokaryotic names with Standing in Nomenclature now gives Heyndrickxia coagulans as the correct name, with Bacillus coagulans as a synonym. Supplement labels have not caught up, so you will usually still see Bacillus coagulans or a brand name such as LactoSpore or GanedenBC30.
How spore based probiotics differ
Spore based probiotics include Bacillus species and some Clostridium species. The appeal is stability. In a lab study by the maker of the MTCC 5856 strain, its spores resisted simulated stomach acid and high heat far better than Lactobacillus strains, and 73% survived microwave cooking conditions. In a computer-controlled model of the human gut, 97% of GBI-30, 6086 spores survived the stomach compartment, about half survived the whole upper gut, and most of those had germinated. The first author worked for the strain’s maker, and these are lab models, not people.
Other spore formers we carry include Bacillus subtilis DE111 in Goli Pre+Post+Probiotics gummies. Spores do not mean every product is shelf stable, though: the Pendulum formula below, which contains Clostridium butyricum, says to refrigerate. Always follow the storage directions.
Bacillus coagulans strains and the research
The NIH Office of Dietary Supplements (ODS) notes that probiotics are identified by genus, species and strain, and results for one strain do not transfer to another. Three B. coagulans strains have most of the published human data:
| Strain | Brand name | Human studies | Who ran them |
|---|---|---|---|
| GBI-30, 6086 | GanedenBC30 | Two 8-week pilots in adults with IBS (44 and 52 people); one found fewer daily bowel movements, the other only within-group changes | Small pilots of a proprietary ingredient; FDA GRAS notice 399 (2012) |
| Unique IS2 (MTCC 5260) | Unique IS2 | 136 adults and 141 children aged 4 to 12 with IBS, 8 weeks; improved pain and stool measures | Authors employed by the strain maker, Unique Biotech |
| MTCC 5856 | LactoSpore | Pilots of 36 and 40 adults with IBS, 90 days | Authors employed by the strain maker, Sami Labs and Sabinsa; FDA GRAS notice 601 (2016) |
A 2026 strain-by-strain meta-analysis of single-strain probiotic trials in IBS found support for Unique IS2 on key symptoms and for MTCC 5856 on quality of life. These are findings in people diagnosed with IBS, not claims about any supplement, and the trials were small and mostly industry-run. Ongoing digestive symptoms deserve a doctor’s evaluation.
Products that contain Bacillus coagulans
Two fiber gummies we sell add the LactoSpore strain (MTCC 5856). Metamucil Fiber Gummies with Probiotics list 5 g of fiber from inulin and soluble corn fiber and 1 billion CFU of Bacillus coagulans through the date printed on the package; they have no added sugar, contain xylitol and are not intended for children. Benefiber Prebiotic Fiber Gummies, now labeled Dual Action Biotic, pair 3 g of chicory inulin with 1 billion CFU, list the strain under its old name Lactobacillus sporogenes, and are labeled for adults and children 6 and up. Both contain inulin, which can cause gas when you start; see our guide to fiber supplement side effects. You can compare more labels in our fiber and gut health category.
Side effects and who should be careful
WebMD lists gas and upset stomach as common side effects of B. coagulans, with rare serious allergic reactions and infections in people at high risk. The Natural Medicines database rates it possibly safe for adults by mouth for up to about six months and advises avoiding it during pregnancy and breastfeeding because of limited data. ODS adds that probiotics have been linked to a few cases of bloodstream infections, mostly in people who were severely ill or immunocompromised, and in 2023 the FDA warned about serious infections in preterm infants given probiotics.
- Ask a doctor first if you have a weakened immune system, are having chemotherapy, have a central line or port, or are seriously ill.
- Antibiotics may reduce how well a probiotic works; WebMD suggests taking B. coagulans at least 2 hours apart from them.
- Immune-suppressing medicines: interactions are not fully understood, so check with your prescriber.
- Babies and children: follow the age limits on the label and ask a pediatrician.
An FDA GRAS letter means the agency had no questions about a company’s conclusion that a strain is safe as a food ingredient at stated levels; in its letter on MTCC 5856, the FDA says it has not made its own determination. For timing tips and early digestive effects, see when to take probiotics.
Clostridium butyricum: another spore-forming probiotic
Clostridium butyricum is an anaerobic, spore-forming bacterium named for the butyrate it produces. One well-known strain, MIYAIRI 588 (CBM 588), has been sold in Japan for decades, where it is classed as a pharmaceutical or over-the-counter probiotic. A safety study by its maker found no genes for the major Clostridium toxins or botulinum toxins. It is not risk-free: a 2024 report in the CDC journal Emerging Infectious Diseases described 5 cases of C. butyricum bloodstream infection among 6,576 patients with positive blood cultures at a Japanese hospital (0.08%). The bacteria matched the MIYAIRI 588 strain, and 4 of the 5 patients had weakened immune systems.
Pendulum GLP-1 Probiotic contains a different strain, Clostridium butyricum WB-STR-0006, with Akkermansia muciniphila, Bifidobacterium infantis and chicory inulin. It is a dietary supplement, not a GLP-1 medicine; the brand states it is not intended for weight loss, and the label says to refrigerate it. Our Akkermansia guide explains that ingredient.
Butyrate supplement basics
Butyrate is a short-chain fatty acid that gut bacteria make when they ferment fiber that escapes digestion, and it is a major fuel for the cells lining the colon. Much of the interest in it comes from lab and animal research. A butyrate supplement, usually a butyrate salt or tributyrin, faces a delivery problem: a 2025 lab study notes that most butyrate taken by mouth is absorbed in the small intestine and relatively little reaches the colon. Tributyrin is designed to carry more of it further, but human data are very limited, and that study was funded by a tributyrin maker. Eating fermentable fiber is the natural route to butyrate; see our guides to inulin and prebiotics and probiotics.
How to read a Bacillus coagulans label
- Look for the full strain name, such as MTCC 5856, GBI-30, 6086 or Unique IS2, not just the species.
- Check that the CFU count is stated through the expiration date, not only at manufacture.
- Match the strain to published studies, and note who funded them.
- Follow storage directions, the label’s age limits and your healthcare provider’s advice.
Our guide on how to choose a probiotic walks through these checks in more detail.
Frequently Asked Questions
What is Bacillus coagulans used for?
It is sold as a probiotic for digestive support. Small, mostly industry-funded trials of specific strains have been done in people with IBS, and WebMD notes its benefits are not well defined.
Is Bacillus coagulans the same as Heyndrickxia coagulans?
Yes. It was renamed Weizmannia coagulans in 2020 and Heyndrickxia coagulans in 2023. Labels usually still say Bacillus coagulans.
Are spore based probiotics better than regular probiotics?
Spores survive heat and acid better in lab tests, which helps shelf life. Whether a product helps depends on the specific strain and the evidence for it, not on spores alone.
What are the side effects of Bacillus coagulans?
Gas and upset stomach are most common. Serious infections and allergic reactions are rare and mostly reported in people with weakened immune systems.
Is Clostridium butyricum safe?
Strain MIYAIRI 588 has decades of use in Japan and no major toxin genes, but rare bloodstream infections have been reported, mostly in immunocompromised patients. Ask a doctor if that applies to you.
Should I take a butyrate supplement?
Human evidence is limited, and most oral butyrate is absorbed before it reaches the colon. Ask a healthcare provider, and remember that fiber is how gut bacteria make butyrate.
Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed September 2026.
Related guides: Best Probiotic? How to Choose a Probiotic by Strain, CFU and Evidence, When to Take Probiotics: Timing, How Long They Take and Side Effects, Prebiotic vs Probiotic: Differences, Synbiotics and Postbiotics Explained, Probiotics for Constipation: What the Research Shows, Strain by Strain.