Synopsis

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

Bifidobacterium lactis is a probiotic commonly utilized for its beneficial effects on gut health and immune modulation. There is emerging scientific interest regarding the potential of probiotics, including B. lactis, in the management of allergic rhinitis. The theoretical rationale involves the modulation of immune responses, particularly the enhancement of regulatory T cells and the balancing of Th1/Th2 responses, which are often skewed in allergic diseases like rhinitis.

Several small randomized controlled trials and meta-analyses have evaluated the effects of probiotics on allergic rhinitis symptoms, with some including B. lactis strains either alone or in combination with other probiotics. Some studies report modest improvements in nasal symptoms, quality of life, or reduction in medication use. For example, a 2016 systematic review in Allergy suggested that certain probiotic strains, including Bifidobacterium species, may provide symptomatic relief in allergic rhinitis, though study quality and strain specificity varied.

However, the overall quality of evidence is low to moderate, with significant heterogeneity in probiotic formulations, dosing, and study populations. Direct evidence supporting B. lactis as a sole agent for rhinitis is limited, and most findings come from multi-strain formulations. Thus, while there is a scientific basis for its use and some preliminary clinical evidence, the efficacy remains inconclusive and further high-quality, strain-specific research is needed.

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