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Bifidobacterium longum BB536

Bifidobacterium longum BB536 (Morinaga)

A long-studied Japanese Bifidobacterium with the strongest data in cedar-pollen allergy and gut regularity

Moderate evidence 🦠Probiotics🛡️Gut & Immune

✚ Updated · How we grade evidence

Evidence tier
Moderate
Research weight
Citations
10 verified / 10
Classification
Probiotics
❝
What the evidence says. Several controlled trials; effects real but modest or context-dependent.

What is Bifidobacterium longum BB536?

Bifidobacterium longum BB536 (Bifidobacterium longum BB536 (Morinaga)) is a probiotic strain used for eases japanese cedar pollen allergy symptoms (ocular and nasal) and suppresses pollen-driven tarc/th2 chemokine rises. NutriDex grades the human evidence as Moderate. Bifidobacterium longum BB536 (Morinaga), isolated from a healthy infant in 1969, is one of the most extensively studied probiotic strains, with its best-supported indication being allergic rhinitis from Japanese cedar pollinosis: multiple double-blind RCTs show it modestly eases nasal and ocular symptoms and blunts pollen-driven rises in Th2-attracting chemokines. Smaller RCTs also support improved bowel regularity in constipated adults/elderly, induction of remission as adjunctive therapy in mild-to-moderate ulcerative colitis (endoscopic/Mayo subscore improvement, though primary clinical-remission endpoints often miss significance), and reduced influenza incidence/fever and preserved NK-cell activity in elderly. A large pediatric RCT found reduced respiratory-illness duration but no diarrhea benefit. Effects are real but generally modest and indication-specific.

Purported Benefits

✓Eases Japanese cedar pollen allergy symptoms (ocular and nasal) and suppresses pollen-driven TARC/Th2 chemokine rises
✓Improves stool frequency and bowel regularity in adults and elderly with constipation
✓Adjunct in mild-to-moderate ulcerative colitis: improves endoscopic and Mayo subscores
✓Reduces influenza incidence and fever and preserves NK-cell activity in elderly
✓Shortens duration of upper-respiratory symptoms (e.g. sore throat) in pre-school children
✓Modulates gut microbiota, increasing beneficial Faecalibacterium abundance

Evidence by outcome

The same supplement can be well-proven for one use and unproven for another — here is the human evidence graded outcome by outcome.

OutcomeEvidenceEffectStudies
Japanese cedar pollen allergic rhinitisMultiple small DB RCTs ease ocular/nasal symptoms and blunt Th2 chemokines; modest, indication-specific. Moderate ↑ benefit · small 3
Bowel regularity / stool frequency (constipation)Two elderly RCTs improved stool frequency at wk 4 but missed their primary composite endpoints. Preliminary ↑ benefit · small 2
Ulcerative colitis (adjunct)One RCT (Tamaki, n=56) improved endoscopic/Mayo subscores; clinical-remission endpoint not significant. Preliminary ↑ benefit · small 1
Influenza incidence / NK-cell activity (elderly)Two elderly RCTs lowered influenza/fever and preserved NK activity; small samples. Preliminary ↑ benefit · small 2
Upper-respiratory symptom duration (children)One 520-child RCT shortened sore-throat duration; no effect on diarrhea. Preliminary ↑ benefit · small 1

Dosing & Compounds

Typical Dose
Typically 1x10^10 to 5x10^10 CFU/day for allergy/gut/immune indications (up to 2-3x10^11 CFU/day in ulcerative colitis trials); freeze-dried powder, capsules, or fermented milk, taken once or twice daily, ideally for several weeks (allergy trials pre-load before/through pollen season).
Active Compounds
Bifidobacterium longum subsp. longum BB536 (ATCC BAA-999 / Morinaga)Used in BIfidobacterium triple mixes (BB536 + B. breve M-16V + B. infantis M-63)Freeze-dried powder, capsules, fermented-milk/yogurt formatsFDA GRAS and EFSA QPS-listed; used in infant formula

Safety & Cautions

Very well tolerated with a long history of safe use; FDA GRAS (including infant formula) and EFSA QPS status, with no serious adverse events across pediatric, elderly, pregnant, and immunosuppressed-medication populations. Mild, transient gas or bloating may occur on initiation. As with any live probiotic, exercise caution in critically ill, severely immunocompromised patients, or those with central venous catheters or compromised gut barriers, where rare bacteremia risk cannot be excluded. Educational only — always check with your doctor or pharmacist before combining Bifidobacterium longum BB536 with any medicine.

Key Studies ★ 10 studies

RCT Inoue 2023 ✓ Full text
RCT in elderly with chronic constipation (n=80, BB536 5x10^10 CFU/day): significant improvement in stool frequency at week 4 vs placebo, though primary endpoint was not met.
RCT Takeda et al. 2023 ✓ PubMed
In 79 chronically constipated elderly adults, 4 weeks of BB536 (5x10^10 CFU/day) significantly improved stool frequency versus placebo (between-group/within-group P=0.008), though the primary composite endpoint was not met.
RCT Ejima et al. 2024 ✓ PubMed
In healthy adults, BB536-containing fermented milk significantly increased relative abundance of beneficial Faecalibacterium versus placebo by day 3 (persisting to day 17), alongside rises in tryptophan-derived indole metabolites.
RCT Tamaki 2016 ✓ PubMed
Double-blind multicenter RCT (n=56, active UC): BB536 (2-3x10^11 CFU/day, 8 wk) showed remission in 63% vs 52% placebo and significantly improved Rachmilewitz endoscopic index and Mayo subscore.
RCT Lau 2018 ✓ PubMed
10-month RCT (n=520 Malaysian pre-schoolers): BB536 reduced respiratory-illness duration (sore throat -46%) and increased Faecalibacterium; no significant effect on diarrhea.
RCT Namba 2010 ✓ PubMed
RCT in elderly (mean 86.7 y): BB536 (1x10^11 CFU/day) significantly lowered the proportion contracting influenza and with fever, and raised NK-cell and neutrophil activity.
RCT Akatsu 2013 ✓ PubMed
RCT in elderly enteral-tube-fed patients (n=45): NK-cell activity declined in placebo but was preserved with BB536; no significant effect on influenza vaccine HI titers.
RCT Xiao 2006 ✓ PubMed
RCT (n=40, cedar pollinosis): BB536 yogurt significantly improved ocular symptoms vs placebo (OR 0.31, 95% CI 0.10-0.97, p=0.044) and raised IFN-gamma.
RCT Xiao 2007 ✓ PubMed
Double-blind RCT (n=44) during pollen season: BB536 significantly reduced rhinorrhea, nasal blockage, and composite symptom scores and fewer subjects withdrew for severe symptoms vs placebo.
RCT Tahara 2007 ✓ PubMed
Environmental-exposure-unit crossover study: BB536 (~5x10^10 twice daily) reduced cedar-pollen-induced allergic symptoms vs placebo.
10 sources cited · 10 verified Search all studies on PubMed ↗

Common questions about Bifidobacterium longum BB536

What is Bifidobacterium longum BB536 used for?

Bifidobacterium longum BB536 is most often taken for Eases Japanese cedar pollen allergy symptoms (ocular and nasal) and suppresses pollen-driven TARC/Th2 chemokine rises, Improves stool frequency and bowel regularity in adults and elderly with constipation, Adjunct in mild-to-moderate ulcerative colitis: improves endoscopic and Mayo subscores, Reduces influenza incidence and fever and preserves NK-cell activity in elderly. A long-studied Japanese Bifidobacterium with the strongest data in cedar-pollen allergy and gut regularity

Does Bifidobacterium longum BB536 work — what does the evidence say?

Moderate evidence. Several controlled trials; effects real but modest or context-dependent. Bifidobacterium longum BB536 (Morinaga), isolated from a healthy infant in 1969, is one of the most extensively studied probiotic strains, with its best-supported indication being allergic rhinitis from Japanese cedar pollinosis: multiple double-blind RCTs show it modestly eases nasal and ocular symptoms and blunts pollen-driven rises in Th2-attracting chemokines. Smaller RCTs also support improved bowel regularity in constipated adults/elderly, induction of remission as adjunctive therapy in mild-to-moderate ulcerative colitis (endoscopic/Mayo subscore improvement, though primary clinical-remission endpoints often miss significance), and reduced influenza incidence/fever and preserved NK-cell activity in elderly. A large pediatric RCT found reduced respiratory-illness duration but no diarrhea benefit. Effects are real but generally modest and indication-specific.

What is the typical dose of Bifidobacterium longum BB536?

Typically 1x10^10 to 5x10^10 CFU/day for allergy/gut/immune indications (up to 2-3x10^11 CFU/day in ulcerative colitis trials); freeze-dried powder, capsules, or fermented milk, taken once or twice daily, ideally for several weeks (allergy trials pre-load before/through pollen season).

Is Bifidobacterium longum BB536 safe? Any cautions or side effects?

Very well tolerated with a long history of safe use; FDA GRAS (including infant formula) and EFSA QPS status, with no serious adverse events across pediatric, elderly, pregnant, and immunosuppressed-medication populations. Mild, transient gas or bloating may occur on initiation. As with any live probiotic, exercise caution in critically ill, severely immunocompromised patients, or those with central venous catheters or compromised gut barriers, where rare bacteremia risk cannot be excluded.

How many studies support Bifidobacterium longum BB536?

NutriDex cites 10 sources for Bifidobacterium longum BB536, graded "Moderate".

Cite this page
APA

Peh, D. (2026). Bifidobacterium longum BB536 (Bifidobacterium longum BB536 (Morinaga)): Benefits, Dosage, Side Effects & Evidence. NutriDex — The Supplement Research Compendium. Retrieved 26 Jun 2026, from https://nutridex.info/s/bifido-longum-bb536

BibTeX
@misc{nutridex_bifido_longum_bb536,
  author       = {Peh, Daryl},
  title        = {Bifidobacterium longum BB536 (Bifidobacterium longum BB536 (Morinaga)): Benefits, Dosage, Side Effects \& Evidence},
  year         = {2026},
  howpublished = {NutriDex --- The Supplement Research Compendium},
  url          = {https://nutridex.info/s/bifido-longum-bb536},
  note         = {Reviewed by Dr Daryl Peh, MBBS Singapore, MMed FM. Accessed 2026-06-26}
}

For medical claims, citing the underlying primary studies linked above is preferred. NutriDex is an educational reference, not medical advice.

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