Last verified: today
Bifidobacterium infantis
Also known as: B. infantis, Bifidobacterium infantis, Bi-26, LMG 11588
Evidence under review. — Not yet rated
Infant gut probiotic that supports healthy microbiome colonization, immune development, and gut barrier function.
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What it does
Bifidobacterium infantis is a beneficial bacterium naturally found in the infant gut that plays a key role in early microbiome development. Clinical trials show it can successfully colonize the...
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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
What the Science Says
Bifidobacterium infantis is a beneficial bacterium naturally found in the infant gut that plays a key role in early microbiome development. Clinical trials show it can successfully colonize the infant gut when given as a supplement, increase Bifidobacterium abundance, support gut barrier integrity, and help shape immune responses in early life. When paired with human milk oligosaccharides (HMOs), it may reduce a pro-allergic immune bias in formula-fed infants and lower the severity of respiratory infections in preclinical models.
What It Doesn't Do
Not proven to improve growth or weight gain in malnourished infants. No solid evidence it works the same way in adults as in infants. Don't expect it to cure infections or replace breastfeeding. Most adult gut health marketing claims are not backed by the provided research.
Evidence-Based Benefits
Colonizes the infant gut successfully and increases Bifidobacterium abundance when given as a synbiotic.
Moderate EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Shapes early immune responses in formula-fed infants, reducing a pro-allergic immune bias seen without breastfeeding.
Moderate EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Helps protect intestinal barrier function and reduce gut dysbiosis in infants after surgical stress.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
May reduce the risk and severity of bronchopulmonary dysplasia in very preterm infants when combined with Clostridium butyricum.
Weak EvidenceEffective at: No established dose from provided studies
Supporting studies (click to view on PubMed):
Absorption & Bioavailability
Moderate — clinical trials show successful gut colonization in infants (detected in 67–72% after 4 weeks), with persistence beyond active supplementation; colonization may be lower in toddlers than infants
Red Flags to Watch For
- Most research is in infants and preterm neonates — adult benefits are largely extrapolated, not directly proven
- Many studies use multi-strain probiotic blends, making it hard to isolate B. infantis effects alone
- One infant malnutrition trial was terminated early due to operational delays, limiting conclusions on growth outcomes
- Use in immunocompromised patients (e.g., cancer patients on chemotherapy) is still under investigation — safety not fully established in those populations
Frequently Asked Questions
What does Bifidobacterium infantis do?
Infant gut probiotic that supports healthy microbiome colonization, immune development, and gut barrier function.
What is the effective dose of Bifidobacterium infantis?
No established dose from provided studies
Is Bifidobacterium infantis safe?
Most research is in infants and preterm neonates — adult benefits are largely extrapolated, not directly proven
What doesn't Bifidobacterium infantis do?
Not proven to improve growth or weight gain in malnourished infants.
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