Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Bifidobacterium breve has been studied for its potential to support individuals with lactose intolerance, though the strength of evidence is modest. The scientific rationale stems from the ability of certain strains of Bifidobacterium to produce β-galactosidase, the enzyme that breaks down lactose into glucose and galactose, which can then be more easily absorbed by the body. Clinical studies in both adults and children have demonstrated that supplementation with Bifidobacterium species, including B. breve, may improve lactose digestion and reduce symptoms like bloating, gas, and diarrhea. For example, a randomized controlled trial published in 2012 found that a mixture of probiotics including B. breve reduced hydrogen breath test values and improved symptoms in lactose-intolerant individuals.

However, the evidence is not overwhelmingly strong. Most studies use combinations of probiotic strains rather than B. breve alone, making it difficult to attribute effects solely to this species. Moreover, the degree of benefit appears to vary among individuals, and not all studies show significant improvements. B. breve is not traditionally used for lactose intolerance, and its use in this context is based on recent scientific investigations rather than longstanding medical or cultural practice. Overall, while there is some scientific evidence supporting the use of B. breve to help with lactose intolerance, the effect size and consistency are moderate, justifying a rating of 2 on the evidence scale.

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