Last verified: today
Bifidobacterium animalis
Also known as: B. animalis, Bifidobacterium animalis subsp. lactis, B. animalis subsp. lactis, BB-12, Bb12, B. lactis
Evidence under review. — Not yet rated
Probiotic bacteria that supports gut health, immune function, and may reduce constipation and respiratory infections.
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What it does
Bifidobacterium animalis is a beneficial probiotic bacterium naturally found in the human gut. Clinical trials show it can increase the abundance of healthy gut bacteria, improve stool...
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Evidence quality
Evidence base hasn't been formally rated yet. See research below.
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Clinical dose
No established dose from provided studies
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Found in
What the Science Says
Bifidobacterium animalis is a beneficial probiotic bacterium naturally found in the human gut. Clinical trials show it can increase the abundance of healthy gut bacteria, improve stool consistency, and reduce constipation symptoms. Several randomized controlled trials also suggest it may help reduce the frequency and severity of respiratory infections in children and support immune function, particularly when combined with other probiotic strains.
What It Doesn't Do
Not a cure for any disease. Won't replace medical treatment for Parkinson's disease or cancer. No evidence it works as a standalone treatment for serious immune conditions. Lab studies on mice don't guarantee the same results in humans. Most benefits are modest and strain-specific — one B. animalis strain's results don't automatically apply to all products.
Evidence-Based Benefits
Increases beneficial Bifidobacterium levels in the gut in infants and adults.
Moderate EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Improves bowel movement frequency and stool consistency in people with constipation.
Moderate EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Reduces frequency and duration of respiratory infections in children when combined with other probiotics.
Moderate EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Enhances immune markers including antibody production and macrophage activity in animal models.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Safe for infants aged 6–36 months with no detected adverse effects over 3 months.
Moderate EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Unknown from provided studies — survival through the gastrointestinal tract varies widely by strain (23–96% in related probiotic evaluations), and live cell viability depends heavily on product formulation and storage
Red Flags to Watch For
- Strain specificity matters: results from one B. animalis strain (e.g., BB-12) may not apply to other strains sold under the same species name
- Most clinical trials in the provided data are in infants and children — adult evidence is more limited
- Many studies are short-term (3 months or less); long-term safety and efficacy data are lacking
- Products with 1,000+ registered formulations vary enormously in dose, strain, and quality — label claims may not reflect actual content
- Animal (mouse) studies showing immune benefits cannot be directly extrapolated to humans
Products Containing Bifidobacterium animalis
See how Bifidobacterium animalis is used in these analyzed products:
Frequently Asked Questions
What does Bifidobacterium animalis do?
Probiotic bacteria that supports gut health, immune function, and may reduce constipation and respiratory infections.
What is the effective dose of Bifidobacterium animalis?
No established dose from provided studies
Is Bifidobacterium animalis safe?
Strain specificity matters: results from one B. animalis strain (e.g., BB-12) may not apply to other strains sold under the same species name
What doesn't Bifidobacterium animalis do?
Not a cure for any disease.
Research Sources
- PubMed
- NIH DSLD
This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-08-27