We use essential cookies (authentication, your saved goals/stack) by default. With your permission we’ll also enable privacy-respecting analytics (Vercel Web Analytics, anonymous load-time metrics) and error-replay diagnostics (Sentry — DOM snapshots only when an error fires) so we can fix bugs faster. Learn more about cookies
Bla6.0
B. lactis (BB-12 / HN019) Research
Mostly mechanism / observational
23 peer-reviewed studies
What the evidence says
Mostly mechanism / observational
Most B. lactis (BB-12 / HN019) studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality meta-analyses and randomised trials published 2000–2026 with a typical study size of 64 participants.
Based on 23 studies · 4 meta-analyses · 17 RCTs · 2,976 total participants
Confidence
High confidence
By outcome
Gut transit & bowel regularityFaster gut transit (hours, measurable radiographically) and a small increase in stool frequency in people with low baseline frequency — the cited sources report an odds ratio for responder status and a significant effect on average defecation frequency, not a per-week figure, and the B. lactis-only pooled estimate was non-significant (WMD 1.34, 95% CI -0.27 to 2.94). No effect on bloating or abdominal pain · 2 weeks
Mostly mechanism / observational11 studies
Digestive symptoms & gut microbiotaFaster gut transit (hours, measurable radiographically) and a small increase in stool frequency in people with low baseline frequency — the cited sources report an odds ratio for responder status and a significant effect on average defecation frequency, not a per-week figure, and the B. lactis-only pooled estimate was non-significant (WMD 1.34, 95% CI -0.27 to 2.94). No effect on bloating or abdominal pain · 2 weeks
Mostly mechanism / observational10 studies
ConstipationFaster gut transit (hours, measurable radiographically) and a small increase in stool frequency in people with low baseline frequency — the cited sources report an odds ratio for responder status and a significant effect on average defecation frequency, not a per-week figure, and the B. lactis-only pooled estimate was non-significant (WMD 1.34, 95% CI -0.27 to 2.94). No effect on bloating or abdominal pain · 2 weeks
Mostly mechanism / observational6 studies
Immune functionEnhanced immune cell markers in the elderly, but these are laboratory biomarkers with no trial showing fewer actual infections · 3-6 weeks
Mostly mechanism / observational5 studies
Diarrhoea & enteric infection
Mostly mechanism / observational5 studies
Safety profile
Mostly mechanism / observational4 studies
Inflammation
Too few graded studies1 study
Active research area
10 studies in the last 5 years · Latest meta-analysis: 2022
200020132026
1RCTn=229 · medium study2024
In plain English: The largest and best-controlled trial of this strain for constipation was null, and the authors explicitly stated it did not confirm earlier positive results.
Cheng J et al. · JAMA Netw Open (2024)
Primary outcome (change in complete spontaneous bowel movements per week): +0.80 with HN019 vs +0.66 placebo — no difference
Triple-blind across 5 hospitals, 8 weeks, Rome III functional constipation
Dose 7.0 billion CFU/day falling to 4.69 billion at end of study
In plain English: The largest trial of this strain missed one co-primary endpoint and its pre-specified responder threshold, though average defecation frequency did exceed placebo.
Eskesen D et al. · Br J Nutr (2015)
Co-primary GI well-being endpoint (global relief of abdominal discomfort): not significant
Co-primary responder analysis: OR 1.31 (95% CI 0.98-1.75, p=0.071) — missed significance
A stricter responder definition did reach significance: OR 1.55 (95% CI 1.22-1.96, p=0.0003)
In plain English: Probiotics supplementation with Ritalin may have some beneficial effects among ADHD children and adolescents, such as improving auditory response control and total score of CPRS.
Sangsefidi ZS et al. · Nutritional neuroscience (2025)
This study showed a significant decrease in the CPRS total score after 4 weeks of intervention in the probiotic group (baseline: 43.96 ± 21.52; fourth week: 37.22 ± 23.01; p = 0.01).
Moreover, at the end of the study, a significant increase was observed in score of auditory response control in the probiotic versus the placebo group (probiotic: 91.55 ± 16.69; placebo: 80.55 ± 17.43; p = 0.02).
Probiotics supplementation with Ritalin may have some beneficial effects among ADHD children and adolescents, such as improving auditory response control and total score of CPRS.
In plain English: Pooling 30 probiotic RCTs, Bifidobacterium lactis was one of the few organisms with a significant effect on stool frequency — directly contradicting an earlier meta-analysis.
van der Schoot A et al. · Clin Nutr (2022)
Response to probiotic treatment 369/647 (57%) vs 252/567 (44%) control — RR 1.28 (95% CI 1.07-1.52, p=0.007)
Probiotics increased stool frequency overall (SMD 0.71, 95% CI 0.37-1.04, p<0.00001), with Bifidobacterium lactis specifically showing a significant effect
Probiotic mixtures, Bacillus coagulans Unique IS2 and Lactobacillus casei Shirota did NOT show a significant frequency effect
In plain English: Probiotics overall shortened whole-gut transit by nearly 14 hours, but B. lactis alone did not significantly increase stool frequency.
Zhang C et al. · Clin Nutr (2020)
Whole gut transit time reduced by 13.75 hours overall (95% CI -21.93 to -5.56)
B. lactis alone did NOT significantly raise stool frequency (WMD 1.34, 95% CI -0.27 to 2.94)
Multispecies products outperformed single strains on several endpoints
In plain English: Pooled species-level data show more frequent bowel movements and faster transit in short courses, but no improvement in abdominal pain or bloating.
Araújo MM et al. · Nutr Rev (2022)
Defecation frequency: SMD 0.26 (95% CI 0.13-0.39) in healthy adults
Colonic transit time reduced only in the 14-days-or-less subgroup: SMD -0.34 (95% CI -0.62 to -0.07)
Stool consistency improved (SMD 0.76) but only in individuals WITHOUT GI symptoms
In plain English: Using radiographic markers rather than questionnaires, whole-gut transit time fell from 49 to 21 hours on the higher dose in 14 days.
Waller PA et al. · Scand J Gastroenterol (2011)
Whole-gut transit fell 49 to 21 hours on high dose (p<0.001) and 60 to 41 hours on low dose (p=0.01); placebo unchanged
Doses were 17.2 billion CFU/day (high) and 1.8 billion CFU/day (low) over 14 days
8 of 9 functional GI symptoms decreased in frequency on high dose, 7 of 9 on low dose, 2 of 9 on placebo
In plain English: 624 children aged 1-4 were followed for a year on prebiotic-plus-HN019 milk; the diarrhoea primary outcome was null, though respiratory and febrile morbidity fell.
Sazawal S et al. · PLoS One (2010)
PRIMARY DIARRHOEA OUTCOME NULL: 6% reduction (95% CI -1 to 12%, p=0.08)
Dysentery episodes reduced 21% (95% CI 0 to 38%, p=0.05); pneumonia 24% (95% CI 0 to 42%, p=0.05); severe acute lower respiratory infection 35% (95% CI 0 to 58%, p=0.05)
Days with severe illness reduced 16% (95% CI 5 to 26%, p=0.004) and days with high fever 5% (95% CI 0 to 10%, p=0.05)
In plain English: The significance of our study is in simultaneously assessing the effect of BB-12, alone and in different delivery vehicles, on the gut transit time, fecal short-chain fatty acids, and the composition of the gut microbiota of the study cohort.
Ba Z et al. · mSphere (2021)
Participants had significantly higher percentage of Streptococcus after consuming YS versus CAP (P = 0.01).
Bifidobacterium-specific terminal restriction fragment length polymorphism analysis revealed a significantly higher percentage of B. animalis after consuming PRE and POST compared to baseline, YS, CAP, and final washout (P < 0.0001).
In addition to fermented dairy products, many new probiotic-containing alternatives such as probiotic-containing juice, probiotic-containing chocolate, and capsules have been developed.
In plain English: From our data, synbiotic supplementation showed a subtle benefit in gut functioning in apparently healthy community-dwelling elders.
Valentini Neto J et al. · Arquivos de gastroenterologia (2020)
From our data, synbiotic supplementation showed a subtle benefit in gut functioning in apparently healthy community-dwelling elders.
Our findings can suggest that the benefits in healthy individuals were less expressive than the ones presented in studies with individuals previously diagnosed as dysbiosis.
Future studies, comparing elders with and without gut dysbiosis can confirm our findings.
In plain English: These improvements may be relevant to this population as they may influence the decision-making process in an environment of high physical and psychological stress.
Valle MCPR et al. · The British journal of nutrition (2021)
Tenseness and sleepiness were decreased in the synbiotic-treated group, but not in the placebo group at post-military training (P = 0·01 and 0·009, respectively; group × time effect).
The other well-being indicators were not affected by the synbiotic supplementation.
In conclusion, 30 d of synbiotic ice cream supplementation containing inulin, L. acidophilus LA-5 and B. animalis BB-12 favourably modulated gut microbiota and improved tenseness and sleepiness in healthy young military undergoing a 5-d field training.
In plain English: The review focuses on Linex® Forte, medicinal product containing the combination of Lactobacillus acidophilus (LA-5) and Bifidobacterium animalis subsp. lactis (BB-12).
Gorelov AV et al. · Terapevticheskii arkhiv (2026)
Probiotics are currently widely used in clinical practice to prevent and treat a wide range of diseases.
The purpose of our review is to highlight what we consider to be the most significant clinical studies on the use of probiotics for preventing antibiotic-associated diarrhea, clostridial diarrhea and pseudomembranous colitis.
The article also presents the results of studies confirming the efficacy of probiotics in Helicobacter pylori eradication therapy.
Confirmed URTIs were observed in 9.4% of the control group, compared to 3.1% in the HN001 group (P=0.273), and 0.0% in the HN019 group (P=0.028).
A similar trend was observed for parentally reported URTIs, with 25.0% in the control group, compared with 14.1% in the HN001 group (P=0.119) and 9.4% in the HN019 group (P=0.019).
No infants in the HN019 group were prescribed antibiotics or antivirals, compared with 3 (4.7%) in the HN001 group and 7 (10.9%) in the control group.
In plain English: According to our results, use of the probiotic strains BB-12 and L3 statistically reduced the risk of AGE and URTIs in healthy children and increased levels of salivary IgA.
DI Pierro F et al. · Minerva pediatrics (2021)
The use of the probiotic formula significantly reduced the incidence and duration of episodes of AGE by 82% and 45%, respectively, and the incidence and duration of episodes of URTIs by 84% and 50%.
Salivary IgA levels significantly increased three-fold after 90 days of probiotic treatment.
According to our results, use of the probiotic strains BB-12 and L3 statistically reduced the risk of AGE and URTIs in healthy children and increased levels of salivary IgA.
In plain English: After amoxicillin/clavulanate, faecal acetate returned to baseline by day 30 in the BB-12 group but stayed suppressed in controls.
Merenstein D et al. · Nutrients (2021)
Antibiotics suppressed faecal acetate in both groups; in the BB-12 arm it recovered to within 1.6% of baseline by day 30, while remaining suppressed in controls
Antibiotics reduced Shannon diversity in all participants at day 7; the decrease was larger and more sustained in the control group
Randomised, allocation-concealed, controlled trial of BB-12 yogurt vs control yogurt (days 1-14) alongside amoxicillin/clavulanate (days 1-7)