Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Lactobacillus delbrueckii subsp. bulgaricus is a probiotic bacterium primarily known for its role in the fermentation of yogurt. Scientific studies have investigated the impact of this probiotic, often in combination with Streptococcus thermophilus, on gastrointestinal health, including the small intestine. Research indicates that yogurt containing L. delbrueckii bulgaricus can help maintain or restore healthy gut microbiota, which may be disrupted by antibiotics or gastrointestinal disorders. Some studies suggest that this strain can survive transit through the upper digestive tract and transiently colonize the small intestine, where it may support barrier function, modulate local immune responses, and potentially inhibit the growth of pathogenic bacteria.

However, the direct evidence for specific supportive effects on the small intestine is moderate and largely extrapolated from broader studies on overall gut health or yogurt consumption. Most clinical trials have focused on general digestive comfort or symptoms such as lactose intolerance, rather than targeted small intestine outcomes. While traditional use is not a primary reason for its inclusion—since its use in yogurt is largely for fermentation—there is a reasonable scientific basis for its potential benefits to small intestine health, mainly via modulation of the gut microbiome and indirect immune support. Thus, the evidence rating is a 3: moderate, with more robust data needed for small-intestine-specific claims.

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