Home Ingredients Morinaga BB536 (Bifidobacterium longum BB536)
Gut Health

Morinaga BB536 (Bifidobacterium longum BB536)

Evidence Level
Preliminary
1 Clinical Trial
3 Documented Benefits
1/5 Evidence Score

Morinaga BB536 is a specific probiotic strain of Bifidobacterium longum from Morinaga Milk Industry, used in foods and supplements. Evidence applies to this strain only, not to Bifidobacterium longum in general. The only study cited on this page is a single exploratory 4 week trial in 60 healthy young male athletes, and it found no significant difference between BB536 and placebo in digestive symptoms, gut bacteria measures, or related metabolites. Immune function was not measured at all.

Studied Dose The single trial cited here used 46 billion CFU per day for 4 weeks, taken alongside 70 g per day of whey protein, and it did not show a significant benefit over placebo. Typical supplement labels list 1 to 5 billion CFU per day, far below the amount that was tested.
Active Compound Bifidobacterium longum BB536, a live probiotic strain delivered at defined CFU counts.

Benefits

Digestive comfort: no significant difference versus placebo

In the one trial cited here, diarrhea-related scores improved from the starting point within the BB536 group, but there was no significant difference versus placebo across the full group of 60 athletes. Constipation and regularity were not outcomes of that trial, so nothing on this page supports a claim about them.

Supported by Trial 1

Immune effects: not tested

No immune measurements of any kind were taken in the study cited on this page. There is no support here for effects on immune defenses, respiratory infections, or seasonal immune challenges.

Supported by Trial 1

Gut bacteria measures: no change found

In the cited 4 week trial, gut microbiota measures and metabolite profiles did not differ significantly between BB536 and placebo for the group as a whole. Differences turned up only in small subgroups defined by each person's starting bacteria, which the authors treat as early ideas to test later, not as proof.

Supported by Trial 1

Mechanism of action

1

Bifidobacterial colonization

The proposed idea is that BB536 passes through the gut, competes with less desirable microbes, and shifts the metabolites bacteria produce. In the trial cited here, both microbiota measures and metabolite profiles were no different from placebo, so this stays a theory rather than something the page's evidence shows.

2

Immune modulation (theory only, not measured here)

Gut bacteria interact with immune tissue in the gut wall, which is the general reason probiotics get studied for immune effects. That is background biology. No immune outcome was measured in the study cited on this page.

Clinical trials

1
BB536 plus whey protein in male athletes: exploratory trial, no significant overall effect
PubMed

Exploratory randomized, double-blind, placebo-controlled trial. 46 billion CFU per day of BB536 for 4 weeks, with both groups also taking 70 g per day of whey protein. (Miyamoto et al. 2026, Journal of the International Society of Sports Nutrition)

60 healthy male athletes, average age about 18.6 years, all on a high protein diet.

In the overall group there were no significant differences between BB536 and placebo in gastrointestinal outcomes, gut microbiota measures, or metabolite profiles. Diarrhea scores improved from baseline within the BB536 group, and some differences showed up in subgroups defined by starting gut bacteria, but the authors state these should be read as exploratory and hypothesis-generating because they did not extend to the full group. The study also cannot separate BB536 from the whey protein everyone was taking.

Side effects and drug interactions

Common Potential side effects

Generally well tolerated in the one cited trial, which ran 4 weeks in healthy young men. Longer-term and broader-population safety data are not cited on this page.
Mild, temporary gas or bloating can occur at first.
Immunocompromised individuals should consult a doctor before live probiotics.

Important Drug interactions

Antibiotics — separate dosing by a few hours.
Immunosuppressants — use live probiotics cautiously if immunocompromised.
Tell your doctor if you have a serious illness or a central line.

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Frequently asked questions about Morinaga BB536 (Bifidobacterium longum BB536)

What is Morinaga BB536?

Morinaga BB536 is a specific probiotic strain of Bifidobacterium longum from Morinaga Milk Industry, used in foods and supplements. Evidence applies to this strain only, not to Bifidobacterium longum in general.

What is Morinaga BB536 used for?

Morinaga BB536 is researched primarily for Gut Health. In the one trial cited here, diarrhea-related scores improved from the starting point within the BB536 group, but there was no significant difference versus placebo across the full group of 60 athletes.

What is the recommended dosage of Morinaga BB536?

The clinically studied dose is The single trial cited here used 46 billion CFU per day for 4 weeks, taken alongside 70 g per day of whey protein, and it did not show a significant benefit over placebo. Always follow the product label and check with a healthcare provider for personal advice.

Is Morinaga BB536 safe, and does it have side effects?

For most healthy adults, Morinaga BB536 is well tolerated at studied doses. Reported effects can include: Generally well tolerated in the one cited trial, which ran 4 weeks in healthy young men. Longer-term and broader-population safety data are not cited on this page. Mild, temporary gas or bloating can occur at first. It may also interact with some medications. Morinaga BB536 is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Morinaga BB536 interact with any medications?

Possible interactions include: Antibiotics — separate dosing by a few hours. Immunosuppressants — use live probiotics cautiously if immunocompromised. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Morinaga BB536?

NutraSmarts rates the evidence for Morinaga BB536 as Preliminary (1 out of 5). It is backed by 1 clinical trial and 1 cited reference summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(1 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Miyamoto S, Yoshimoto S, Katsumata N, et al. Exploratory randomized, double-blind, placebo-controlled trial of Bifidobacterium longum BB536 with whey protein in male athletes; no significant between-group differences. J Int Soc Sports Nutr. 2026;23(1):2664664..PubMedUsed to support: Only cited human trial. Found no significant between-group differences in gastrointestinal outcomes, microbiota indices, or metabolites; within-group and subgroup findings only, which the authors call exploratory and hypothesis-generating.