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B. subtilis is a probiotic with antioxidant properties and with beneficial effects on the GI tract and the immune system.



Bacillus subtilis is a spore creating Gram-positive bacterium, found in soil and the gastrointestinal tract of ruminants, such as cattle, goats and sheep. It is also found in the human GI tract.

B. subtilis can survive in harsh environmental conditions. Its spores can survive up to 6 years in space if coated by dust particles protecting it from solar UV rays (R).

This bacterium is widely used on an industrial scale by biotechnology companies, for the production of enzymes, pharmaceutical components and GMOs. As a human probiotic, however, B. subtilis has been somewhat neglected.

B. subtilis cultures were popular worldwide before the introduction of antibiotics, when B. subtilis was used as an immunostimulatory agent to aid treatment of gastrointestinal and urinary tract diseases. After the 1950s, with the introduction of antibiotics, this probiotic declined in popularity.

On the other hand, B. subtilis has been extensively used in the livestock and poultry industries as antibiotic alternatives (R).

B. subtilis is used in the commercial production of the Japanese food natto, as well as the similar Korean food cheonggukjang. Furthermore, a formulation containing a combination of Enterococcus faecium and Bacillus subtilis has been available and widely used in Asia since 1994 (R).

Health Benefits of B. subtilis

1) B. subtilis has Antioxidant Properties


B. subtilis has DNA protective and antioxidant (superoxide scavenging) activity (R).

A B. subtilis signal molecule induces the heat shock protein Hsp27 in mammalian cells, which protects intestinal cells against oxidant-mediated tissue damage and loss of barrier function (R).

2) B. subtilis May Be Beneficial in Obesity

B. subtilis decreases weight gain and alleviates oxidative stress in obese mice (R).

3) B. subtilis May be Beneficial in Diabetes

Diabetic patients who develop foot ulcers are at more risk of dying prematurely than those without the complication. B. subtilis shows antimicrobial activity against four diabetic foot ulcer bacterial pathogens (R).

4) B. subtilis is Beneficial for the GI Tract


B. subtilis Beneficially Modifies Gut Microbiota

Ingestion of significant quantities of B. subtilis spores is thought to restore the normal gut microbiota in humans following extensive antibiotic usage or illness (R).

B. subtilis increases Bifidobacteria, decreases some Clostridium groups (R), and enhances the growth of L. reuteri and L. acidophilus in laboratory experiments (R).

B. subtilis Relieves Constipation

Combined regimen of lactulose and live binary B. subtilis is an effective and safe therapeutic method for elderly with functional constipation (R).

B. subtilis Ameliorates Diarrhea

B. subtilis significantly reduced the incidence of antibiotic-associated diarrhea in patients, and prevented nausea, bloating, vomiting and abdominal pain (R).

In one of the Asian clinical trials, a mixture of E. faecium and B. subtilis improved abdominal pain, distention and fever in patients with acute diarrhea. However, most of the trials did not find a significant difference with these probiotics in acute diarrhea treatment (R).

Results were more encouraging in chronic diarrhea patients, where a significant increase in Bifidobacteria levels following therapy was observed. Treatments also prevented diarrhea relapse (R).

B. subtilis May be Beneficial in IBS

B. subtilis together with E. faecium significantly reduced the severity and frequency of abdominal pain in patients with Irritable Bowel Syndrome (IBS) in a single Asian clinical trial, however other results are not as convincing, and further studies are needed (R).

B. subtilis is Beneficial in IBD

In Asian studies involving patients with ulcerative colitis, the addition of a B. subtilis probiotic significantly reduced the number of days with bloody stool, lead to complete remission without relapse, and significantly increased the efficacy of mesalazine or sulfasalazine therapy (R).

A higher dose of B. subtilisis administration ameliorated dysbiosis and gut inflammation by balancing beneficial and harmful bacteria and associated anti- and pro-inflammatory cytokines in mice (R).

B. subtilis and its competence and sporulation factor (CSF) ameliorate intestinal inflammation and improve survival in mice with colitis (R,R).

B. subtilis reduces inflammation and suppresses colitis in rats (R).

5) B. subtilis is Beneficial in H. pylori therapy

B. subtilis containing probiotics improved H. pylori eradication and decreased diarrhea and total side effects, when used in conjuction with triple therapy (R).

6) B. subtilis Boosts Immunity

B. subtilis spores stimulate the immune response when co-administered with a vaccine for papillomavirus type 16 (HPV-16) in mice (R).

B. subtilis both can instruct a balanced Th1 and Th2 immune response to specific antigens in mice (R).

Intravenous injection of B. subtilis in mice induces plasma IFN-y production (R).

7) B. subtilis Combats Infections


Bacteriocin of B. subtilis was shown to inhibit the growth of various pathogenic bacteria (R).

B. subtilis decreased the frequency of respiratory infections in elderly subjects (R).

B. subtilis inhibits disease transmission in patients with acute non-typhoid Salmonella gastroenteritis (R).

B. subtilis isolated from soil shows antimicrobial activity against human pathogenic Candida albicans (R).

Metabolites of B. subtilis decrease the resistance of urogenital pathogenic microflora to antibiotics in patients with urinary tract infections, resulting in accelerated elimination (R).

Spores of B. subtilis attenuate the symptoms of Clostridium difficile infection in mice (R).

B. subtilis suppresses infection and enteropathy in suckling mice infected with C. rodentium (R).

8) B. subtilis May be Beneficial in Liver Disorders

B. faecium and B. subtilis shift the intestinal microbiota of patients with liver cirrhosis back towards levels observed in healthy subjects. These probiotics also reduce circulating endotoxin levels in cirrhotic patients with endotoxaemia (R).

9) B. subtilis May Benefit the Skin

Continuous oral administration of B. subtilis alleviates the development of skin lesions in mice with atopic dermatitis (R).

10) B. subtilis May be Beneficial for Dental Health

B. subtilis reduces periodontal pathogens in humans (R).

B. subtilis and Bacillus licheniformis supplementation provided a protective effect against bone loss in rats with periodontitis (R).

11) B. subtilis May Alleviates Heat Stress

Exposure to extreme heat can cause illnesses and injuries. B. subtilis was effective in the prevention of complications related to heat stress in rats. When rats were subjected to heat stress (45°C), adverse effects such as morphological changes in the intestine, bacterial translocation, elevated levels of LPS and IL-10, and increased vesiculation of erythrocytes were observed only in animals not protected with B. subtilis (R).

12) B. subtilis May Combat Cancer

Components of B. subtilis inhibit colon cancer cell growth (R,R), hepatocellular cancer cell growth (R), cervix carcinoma cell growth (R), and the growth of human leukemia cells (R) in laboratory experiments.


  • B. subtilis increases IL-8, IL-12 (R) and TGF-β (R).
  • B. subtilis mostly increases IL-10 (R,R,R) (a study where IL-10 is decreased: R).
  • B. subtilis increases IgA (R,R) and IgG (R).
  • B. subtilis decreases IL-4(R), CXCL-1 (R).
  • B. subtilis both decreases (R,R) and increases IL-6 (R).
  • B. subtilis both decreases (R) and increases TNF-α (R).
  • B. subtilis both decreases (R) and increases IL-1β (R).
  • B. subtilis both decreases (R) and increases IFN-γ (R).
  • B. subtilis increases ACP, LDH, NO and iNOS (R).
  • B. subtilis decreases glutathione reductase (GR), xanthine oxidase (XO), heat-shock protein 90 (Hsp90), and lipid synthesis gene 3β-hydroxysteroid-∆24 reductase (DHCR24) (R).
  • B. subtilis decreases glutamic oxaloacetic transaminase (GOT), and glutamic pyruvic transaminase (GPT) activities (R).


B. subtilis is safe and well tolerated by healthy adults (R,R). However, its use in rare cases can lead to bacteremia (infection) (R), hepatotoxicity (R) and heavy exposure to spores can cause allergic asthma (R).

Buy B. subtilis

A probiotic product containing B. subtilis:

  • Probiotics (prescript assist) – great for IBS

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