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Limited evidenceGut health

Bifidobacterium Breve

A bifidobacterium typical of the infant gut, best known from the A1 and M-16V strains. Most adult evidence comes from a handful of small Japanese trials on cognition, not from gut outcomes.

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What the science says

  • Cognitive function in older adults Limited evidence

    A randomized, double-blind, placebo-controlled trial of B. breve A1 in older adults with memory complaints reported improvement on some cognitive tests, and a second trial in suspected mild cognitive impairment found similar signals. Both are small, single-country and industry-linked.

  • Infant gut and preterm outcomes Limited evidence

    B. breve strains, especially M-16V, are used in preterm infant units and appear in randomized trials of single- versus multi-strain Bifidobacterium supplementation, but results across strains and units are inconsistent.

  • Adult digestive symptoms Limited evidence

    There is no adequately sized randomized trial of B. breve alone for IBS, constipation or bloating in adults.

Dosage & safety

Studied doseCognitive trials used about 20 billion CFU per day of B. breve A1. Consumer products typically list 1–10 billion CFU.
SafetyWell tolerated; occasional gas in the first days. As with all live probiotics, avoid in severely immunocompromised patients, those with central venous catheters or critical illness without medical advice.

How to take it

TimingTiming does not matter.
With food?With a meal, which buffers stomach acid.
Worth knowingThe cognitive trials used the A1 strain at 20 billion CFU, and most shelf products supply neither.

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 breve improve memory?

The evidence is limited: small, industry-linked Japanese trials of B. breve A1 in older adults with memory complaints reported improvement on some cognitive tests.

Does Bifidobacterium breve help IBS or bloating?

There is no adequately sized randomized trial of B. breve alone for IBS, constipation or bloating in adults, so its use for digestive symptoms has limited support.

How much Bifidobacterium breve should I take?

Cognitive trials used about 20 billion CFU per day of the B. breve A1 strain, while consumer products typically list 1–10 billion CFU, so most shelf products supply neither the strain nor the dose.

Is Bifidobacterium breve safe?

B. breve is well tolerated, with occasional gas in the first days. Avoid it without medical advice if you are severely immunocompromised, have a central venous catheter or are critically ill, and separate it from antibiotics by at least 2 hours.

Scientific references

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