Lactobacillus delbrueckii bulgaricus — answers to L. bulgaricus, a yogurt culture bacterium
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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: 3 records · searched August 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 August 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.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.