Bacillus pumilus

ProbioticBacillus

What is it

Bacillus pumilus is a spore-forming, soil-dwelling bacterium related to Bacillus subtilis. It is occasionally included in probiotic products, though it is much less commonly used than other Bacillus species.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Any human health condition

Mixed Evidence

No controlled human trials have established benefit. Use of B. pumilus in human probiotic products is uncommon and not well supported.

How it works

Spore-forming bacilli survive stomach acid as dormant spores and germinate in the small intestine. There, they produce enzymes and short-chain fatty acids and may compete with less favorable gut microbes. Bacillus pumilus has been studied mainly for industrial enzyme production rather than human probiotic use. Clinical research on B. pumilus as an oral probiotic in humans is sparse. Most data come from veterinary, aquaculture, and industrial contexts.

Dosage

There is no established human dose. Probiotic products generally provide 1-10 billion CFU per day. Specific clinical recommendations for B. pumilus in humans are not available.

When and how to take it

Most probiotic products are taken once daily, often with or just before a meal.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Bacillus pumilus spores (capsule)

Rare in commercial probiotic products.

Spores survive stomach acid and germinate in the small intestine.

Safety

Bacillus pumilus has been associated with rare case reports of opportunistic infection, mostly in immunocompromised people. It is not on the U.S. FDA's GRAS list in the same way as some other Bacillus species. Use as a human probiotic is uncommon and not well supported by clinical evidence.

Who should be cautious

Avoid in immunocompromised individuals, critically ill patients, and those with central venous catheters. Pregnancy safety is not established.

Interactions

Antibiotics may reduce viability if taken at the same time. Otherwise, no well-characterized drug interactions.

Frequently asked questions

Is Bacillus pumilus the same as Bacillus subtilis?⌄

No. They are related species but are not interchangeable. B. subtilis has a more established human probiotic safety record.

Should I take Bacillus pumilus?⌄

There is limited human clinical evidence for it as a probiotic. Most consumers seeking Bacillus probiotics will find better evidence for B. subtilis or B. coagulans.

References

Bacillus pumilus on Wikidata — Wikidata link

Bacillus pumilus on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Bacillus pumilus (PubMed search) — PubMed link

Track Bacillus pumilus with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store
Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.