Bifidobacterium bifidum

B. bifidum

Snapshot

Indications	Contraindications
Irritable bowel syndrome^{1, 2} Constipation^{3, 4} Gastrointestinal symptoms in diabetes^{4, 5} Helicobacter pylori adjunct⁶ Lactose intolerance⁷ Common cold duration⁸	Immune-compromised conditions⁹ Milk allergy¹⁰

Bifidobacterium bifidum is a probiotic species native to the human gut, taken to shift the intestinal microbiota toward a healthier balance.^{3, 5} Supplementation is used for irritable bowel syndrome^{1, 2} and for constipation and gastrointestinal symptoms, including in type 2 diabetes^3–5. It is also used alongside antibiotic therapy for Helicobacter pylori⁶, and for immune function and common cold episodes, where trials are few. Typical patients are adults with functional bowel symptoms.

Evidence is strain-specific. B. bifidum MIMBb75 outperformed placebo for irritable bowel syndrome in a 2011 trial with live cells and a 2020 trial with heat-inactivated cells. Constipation results are mixed: a 2026 randomized trial of strain G9-1 found no significant gain in overall quality of life¹¹. In elderly ischemic stroke patients, a 2024 retrospective study linked supplementation to better neurological scores and lower inflammatory markers; no randomized trial has tested it. More than four thousand products listing B. bifidum are on the market, mostly capsules, powders, and chewables, often paired with Lactobacillus acidophilus; see Form comparison.

The main caution concerns live organisms in vulnerable patients; heat-inactivated cells were studied partly because of infection concerns in susceptible groups². Health Canada labels for licensed single-ingredient products say not to use with immune-compromised conditions, including long-term corticosteroid treatment⁹. Health Canada labels also ask for a practitioner's advice before use with fever, vomiting, bloody diarrhoea, or severe abdominal pain⁹.

Last updated October 16, 2026. Read how we make monographs.

In the full monograph

44 sources, 36 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
InteractionsThe medicines and supplements it interacts with, the effect of each, and what labeling says to watch.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Word of mouthWhat patients and practitioners report online, kept separate from the clinical evidence.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources