Bifidobacterium animalis subsp. lactis BB-12 for Antibiotic Associated Diarrhea
Verdict: Insufficient Evidence
Across 5 PubMed studies, the evidence for Bifidobacterium animalis subsp. lactis BB-12 in Antibiotic Associated Diarrhea grades Tier D — counter-evidence. Research is still too limited to draw a firm conclusion.
D 🔴 D Counter-Evidence Insufficient Evidence
Why this grade7-layer evidence engine
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Scoring transparency
All scores computed by a 7-layer evidence engine — fully auditableRaw score 0.36
D
C
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← counter-evidence / ineffectiveeffective / strong evidence →
Final grade
D · Insufficient Evidence
Confidence
66%
Broadly consistent
Evidence level
E1
Cochrane high-quality SR/MA
▸View the full decision path (audit trail)
- compute_raw_score — 加權公式: L2×0.30 + L3×0.25 + L5×0.25 + L11×0.10 + L1×0.10 = 0.356
- tier_from_score — 依分數區間映射至 tier letter
- apply_hec_rules — 高階證據未達主導 (1 positive vs 1 negative)，由 raw_score 決定
- tier_strict_requirement_check — Tier 條件達標，未降階
- detect_disputes — 偵測到 0 個 hard + 0 個 soft dispute
- decide_status — 依 tier + dispute 結果決定 status
PubMed studies (5)L2 · primary research & systematic reviews
Probiotics for the prevention of pediatric antibiotic-associated diarrhea (Cochrane Review, Guo et al., update of CD004827.pub5)
Finding: Across 33 RCTs (6352 children) probiotics cut AAD from 19% to 8% (RR 0.45, 95% CI 0.36-0.56, NNTB 9, moderate-certainty), with high-dose >=5 billion CFU/d driving the effect (RR 0.37, 95% CI 0.30-0.46); BB-12 was not analysed as a separate strain subgroup so this is all-strain context, not direct BB-12 evidence.
View on PubMed Probiotics for the Prevention of Antibiotic-Associated Diarrhea in Outpatients - A Systematic Review and Meta-Analysis (Blaabjerg et al., Antibiotics Basel)
Finding: Pooled across 17 RCTs (3631 outpatients) probiotics cut AAD from 17.7% to 8.0% (RR 0.49, 95% CI 0.36-0.66), but the only BB-12-containing subgroup (L. acidophilus La-5 + B. lactis Bb-12) was NOT significant (RR 0.79, 95% CI 0.47-1.33), unlike LGG (RR 0.29, 95% CI 0.15-0.57) and S. boulardii (RR 0.41, 95% CI 0.30-0.57).
View on PubMed Meta-analysis: probiotics in antibiotic-associated diarrhoea (Videlock & Cremonini, Aliment Pharmacol Ther)
Finding: Across 34 double-blind RCTs (4138 patients) probiotics reduced AAD risk (RR 0.53, 95% CI 0.44-0.63, NNT 8), remaining significant across probiotic-species subgroups, but the analysis pooled at species/all-strain level and reports no standalone B. animalis lactis BB-12 effect size.
View on PubMed Probiotic Yogurt for the Prevention of Antibiotic-associated Diarrhea in Adults: A Randomized Double-blind Placebo-controlled Trial (Velasco et al., J Clin Gastroenterol)
Finding: In 314 hospitalized adults (mean age 76y) AAD occurred in 23.0% of the BB-12-containing probiotic group vs 17.6% of placebo - numerically worse - with absolute risk reduction -5.35% (95% CI -15.4% to 4.7%, p=0.30), and no difference in diarrhea duration, bowel movements, or mortality; authors concluded the LA-5/BB-12/LC-01 mix has no effect on AAD.
View on PubMed Bifidobacterium animalis subsp. lactis BB-12 Protects against Antibiotic-Induced Functional and Compositional Changes in Human Fecal Microbiome (Merenstein et al., Nutrients)
Finding: In 62 healthy adults (42 BB-12 yogurt, 20 control) on amoxicillin/clavulanate, BB-12 yogurt limited the antibiotic-induced drop in fecal acetate (recovered to -1.6% of baseline by day 30 vs sustained suppression in controls) and gave more stable Shannon diversity, but these are microbiome surrogate endpoints and the trial was not powered for, and did not demonstrate, a reduction in clinical AAD.
View on PubMed Regulatory & authoritative positionsL4/L5 · FDA / EMA / NIH ODS / Cochrane / Mayo …
L4a US FDA
Supportive
GRN 856 - Bifidobacterium animalis subsp. lactis strain BB-12; Status: FDA closure with no objections; No-Objection Letter Date: December 9, 2019; Intended Use: 'For use as an ingredient in conventional foods for use by the general population, excluding foods subject to regulation by the USDA, at levels intended to provide 5 x 10^11 CFU/serving.' Notifier: Chr. Hansen, Inc. (Milwaukee, WI). source↗
L4b EU EFSA
Cautious
Scientific Opinion on the substantiation of health claims related to Bifidobacterium animalis ssp. lactis Bb-12 and immune defence against pathogens (ID 863), decreasing potentially pathogenic gastro-intestinal microorganisms (ID 866), 'natural immune function' (ID 924), reduction of symptoms of inflammatory bowel conditions (ID 1469) and maintenance of normal blood LDL-cholesterol concentratio… source↗
L4c UK NHS
Cautious
There's some evidence that probiotics may be helpful in some cases, such as helping to ease some symptoms of irritable bowel syndrome (IBS). But there's little evidence to support many health claims made about them. For example, there's no evidence to suggest that probiotics can help treat eczema. Probiotics are generally classed as food rather than medicine, which means they don't go through t… source↗
L5a NIH Office of Dietary Supplements
Supportive
The BB-12 Bifidobacterium animalis subsp. lactis strain is one of the most documented probiotic strains on the market and has been shown to be effective in alleviating symptoms of a low defecation frequency and infant colic, among others. The strain has been granted GRAS (generally recognized as safe) status in the United States, and the species has QPS (qualified presumption of safety) status … source↗
L5b Mayo Clinic
Cautious
Some people take supplements called probiotics to restore the balance of healthy bacteria in their guts. But the research is mixed on whether probiotics ease symptoms of antibiotic-associated diarrhea. Taking probiotics probably won't do harm, but people with weakened immune systems should not use probiotic supplements. source↗
L5c Cleveland Clinic
Supportive
The most commonly studied for antibiotic-associated diarrhea are Lactobacillus rhamnosus-based and Saccharomyces boulardii-based probiotics. The thing that has really been shown to help the most with preventing diarrhea is taking probiotics when taking antibiotics. Probiotics could possibly be harmful for people with immune deficiencies or those who are severely debilitated. source↗
L5e Specialty Society (condition-mapped)
Neutral
For the prevention of antibiotic-associated diarrhea (AAD) in children, the guideline recommends using Lactobacillus rhamnosus GG (moderate quality of evidence, strong recommendation) or Saccharomyces boulardii (moderate quality of evidence, strong recommendation). The recommendations were formulated only if at least 2 randomized controlled trials using a given probiotic with strain specificati… source↗