Moderate evidenceGut health

Bifidobacterium Bifidum

One of the few probiotic species with a well-replicated IBS result: the MIMBb75 strain improved symptoms in two randomized trials, including a heat-inactivated version. Other claims are weaker.

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What the science says

IBS symptoms Moderate evidence
A randomized, double-blind, placebo-controlled trial of B. bifidum MIMBb75 significantly alleviated IBS symptoms and improved quality of life. A larger multicentre randomized trial of the heat-inactivated strain reproduced the benefit, which is unusual in probiotic research.
Respiratory infections Limited evidence
A double-blind randomized trial of a multi-strain product containing B. bifidum MF 20/5 reported shorter common cold episodes, but the effect cannot be attributed to B. bifidum alone.
Metabolic markers Limited evidence
Small randomized trials of specific strains such as BGN4 report changes in gut permeability markers and inflammatory measures in adults with excess adiposity; these are single studies with surrogate endpoints.

Dosage & safety

Studied doseThe MIMBb75 trials used about 1 billion CFU per day, taken as a single daily capsule for 4–8 weeks. Strain matters more than the count.

SafetyWell tolerated, with adverse event rates similar to placebo in trials. The heat-inactivated form is an option for people who prefer not to take live organisms. Caution with live probiotics in severe immunosuppression or critical illness.

How to take it

TimingOne capsule a day, at whatever time you will remember.

With food?With a meal, which buffers stomach acid.

Worth knowingMIMBb75 works at just 1 billion CFU, so a bigger count on a different product is not a better product.

Interactions

With medications

antibiotics
Antibiotics kill the live organisms. separate by at least 2 hours and continue after the course
immunosuppressants and chemotherapy
Live probiotics have caused bloodstream infections in severely immunocompromised patients. do not start without medical advice

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does Bifidobacterium bifidum help IBS?

Yes, with moderate evidence: the B. bifidum MIMBb75 strain improved IBS symptoms and quality of life in a placebo-controlled trial, and a larger multicentre trial of the heat-inactivated strain reproduced the benefit.

How much Bifidobacterium bifidum should I take for IBS?

The MIMBb75 trials used about 1 billion CFU per day as a single daily capsule for 4–8 weeks. With B. bifidum the strain matters more than the count.

Does Bifidobacterium bifidum prevent colds?

The evidence is limited: a trial of a multi-strain product containing B. bifidum MF 20/5 reported shorter colds, but the effect cannot be attributed to B. bifidum alone.

Does heat-killed Bifidobacterium bifidum work?

Yes, the heat-inactivated form of B. bifidum MIMBb75 improved IBS symptoms in a large multicentre randomized trial, and it is an option if you prefer not to take live organisms.

Scientific references

Randomised clinical trial: Bifidobacterium bifidum MIMBb75 significantly alleviates irritable bowel syndrome and improves quality of life--a double-blind, placebo-controlled study
Guglielmetti S, Mora D, Gschwender M, Popp K — Aliment Pharmacol Ther, 2011
Heat-inactivated Bifidobacterium bifidum MIMBb75 (SYN-HI-001) in the treatment of irritable bowel syndrome: a multicentre, randomised, double-blind, placebo-controlled clinical trial
Andresen V, Gschossmann J, Layer P — Lancet Gastroenterol Hepatol, 2020
Effect of Lactobacillus gasseri PA 16/8, Bifidobacterium longum SP 07/3, B. bifidum MF 20/5 on common cold episodes: a double blind, randomized, controlled trial
de Vrese M, Winkler P, Rautenberg P, Harder T, Noah C, Laue C, Ott S, Hampe J, Schreiber S, Heller K, Schrezenmeir J — Clin Nutr, 2005

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