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Last verified: 17 days ago

Bifidobacterium lactis BL-04

Also known as: B. lactis Bl-04, Bifidobacterium animalis subsp. lactis BL-04, Bl-04

Evidence under review. — Not yet rated

Probiotic strain with early evidence for immune support and inflammation reduction in blends.

  • What it does

    Bifidobacterium lactis BL-04 is a probiotic bacterium — a live microorganism that colonizes the gut and interacts with the immune system. Early clinical research suggests it may help modulate...

  • Evidence quality

    Evidence base hasn't been formally rated yet. See research below.

  • Clinical dose

    No established dose from provided studies alone

See full breakdown ↓ Methodology →

What the Science Says

Bifidobacterium lactis BL-04 is a probiotic bacterium — a live microorganism that colonizes the gut and interacts with the immune system. Early clinical research suggests it may help modulate immune responses, including faster antibody production after oral vaccination and reduced inflammatory markers when used in multi-strain probiotic blends. Most studies use it as part of a combination formula rather than as a standalone ingredient, making it hard to isolate its specific effects.

What It Doesn't Do

Not proven to prevent colds or flu on its own. No evidence it cures or treats rheumatoid arthritis — it was only tested as part of a 5-strain blend. No proof it works better than other probiotic strains. Don't expect dramatic immune results from a single dose.

Evidence-Based Benefits

May speed up IgG antibody production after oral vaccination in healthy adults.

Weak Evidence

Effective at: 2×10^10 CFU daily for 3 weeks

Supporting studies (click to view on PubMed):

PMID 18422632

Reduces TNF-α and IL-6 levels in people with rheumatoid arthritis when used in a probiotic blend.

Weak Evidence

Effective at: 10^9 CFU/g per strain in a 5-strain blend for 60 days

Supporting studies (click to view on PubMed):

PMID 34111674

Survives passage through the stomach and small intestine to reach the colon in meaningful amounts.

Weak Evidence

Effective at: Dose-dependent; higher CFU doses show better recovery

Supporting studies (click to view on PubMed):

PMID 31941108

Absorption & Bioavailability

Moderate — one study confirmed dose-dependent survival through simulated gastro-intestinal passage, meaning viable bacteria do reach the colon, but recovery rates vary by dose.

Red Flags to Watch For

  • Most studies use BL-04 in multi-strain blends, so its individual contribution is unclear
  • Very few large, standalone clinical trials exist for this specific strain
  • Widely used in 1,000+ registered supplement products despite limited solo clinical evidence
  • Open-label and small-sample studies dominate the evidence base — results may not generalize

Frequently Asked Questions

What does Bifidobacterium lactis BL-04 do?

Probiotic strain with early evidence for immune support and inflammation reduction in blends.

What is the effective dose of Bifidobacterium lactis BL-04?

No established dose from provided studies alone

Is Bifidobacterium lactis BL-04 safe?

Most studies use BL-04 in multi-strain blends, so its individual contribution is unclear

What doesn't Bifidobacterium lactis BL-04 do?

Not proven to prevent colds or flu on its own.

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: 2026-05-25