Roll Call

“Lactobacillus delbrueckii bulgaricus?”Here!L. bulgaricus, a yogurt culture bacterium

Biotech

Hasn’t appeared in a scanned product yet.

As a supplement

Talk to your doctor or pharmacist.

Roll Call does not check drug interactions or assess personal safety.

A bacterial species traditionally used, together with Streptococcus thermophilus, as a starter culture to ferment milk into yogurt.

Why it’s used

Taken, usually as part of a probiotic blend, in the hope of supporting digestion or gut bacterial balance.

What the evidence says

Evidence for this particular species as a standalone supplement ingredient is limited; most research on it has examined its role in yogurt fermentation rather than isolated capsule or powder supplementation, and health claims for specific strains generally do not transfer to other strains or products.

Where we looked

There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.

  • PubMed: 0 records · searched September 2026"Lactobacillus delbrueckii bulgaricus"[Title/Abstract] AND (review[pt] OR "safety assessment"[Title/Abstract] OR "risk assessment"[Title/Abstract] OR toxicology[Title/Abstract] OR toxicity[Title/Abstract] OR characterization[Title/Abstract] OR characterisation[Title/Abstract])
  • PubMed: 3 records · searched September 2026"Lactobacillus delbrueckii bulgaricus"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH]
  • PubMed: 7 records · searched September 2026"Lactobacillus delbrueckii bulgaricus"[Title/Abstract]

This says what this database holds under these terms. It is not a finding that no research exists.

Context

Where studied at all outside fermented dairy, doses and strain preparations vary widely between products and are not standardized across the research.

Insufficient dataToo little has been studied to say either way.

Rumors

  1. Lactobacillus bulgaricus supplements support the immune system.

    Supports — suggestivehealth and safety evidence

    Measured as a biomarker.

    Who’s saying this

    • Walmart — a retailer: sells fashion, home goods and more; Walmart+ membership
      How we know who this is
      • “The trademarks Walmart and the Walmart Spark design are registered with the US Patent and Trademark Office.” (their page)
      • “Annual members can save $380 per year!” (their page)

  2. Lactobacillus bulgaricus supplements lower 'bad' cholesterol.

    Does not support — suggestivehealth and safety evidence

    Studied in: overweight adults with cardiometabolic risk factors.

    Measured as a biomarker.

    Who’s saying this

    • tradeKorea — a platform — posts are by its users: B2B marketplace for Korean suppliers; operated by KITA (Korea International Trade Association), a non-profit
      How we know who this is
      • “tradeKorea is a global B2B marketplace where global buyers and suppliers meet to start trade.” (their page)
      • “Our commitment is made possible by KITA, the largest non-profit business organization in Korea, which operates tradeKorea.com” (their page)

  3. Lactobacillus bulgaricus produces histamine and should be avoided by people with histamine intolerance.

    Does not support — suggestivehealth and safety evidence

    Measured as a biomarker.

    Who’s saying this

    • Superpower — a brand: sells health memberships with lab blood testing
      How we know who this is
      • “We started Superpower with one simple belief: we could build a health system capable of helping prevent disease and enhancing human capability.” (their page)
      • “Members get 100+ lab tests from one blood draw.” (their page)

  4. Lactobacillus bulgaricus supports digestive health by producing lactic acid that makes the gut inhospitable to pathogens.

    Not gradedhealth and safety evidence

    Sources cited — no verdict reached.

    What was measured is not yet noted.

    Who’s saying this

    • Time Health — a brand: makes and sells natural-ingredient supplements
      How we know who this is
      • “Time Health was born with a simple but powerful mission: to craft supplements made from natural ingredients, providing nutrients in their most natural and effective form - nourishing the body the way nature intended.” (their page)

  5. Lactobacillus bulgaricus supplements cause bloating and intestinal gas.

    Does not support — suggestivehealth and safety evidence

    Measured as an outcome.

    Who’s saying this

    • Healthline — a publisher: health information publisher; part of RVO Health, backed by Red Ventures and UnitedHealth Group's Optum
      How we know who this is
      • “Healthline is a digital publisher and does not offer personal health or medical advice.” (their page)
      • “Healthline is part of RVO Health, a company backed by Red Ventures and UnitedHealth Group’s Optum.” (their page)