Evidence supporting the use of: Probiotic (unspecified)
For the health condition: Rhinitis, Allergic

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Synopsis

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

Probiotics have garnered scientific interest for their potential role in managing allergic rhinitis, also known as hay fever. Several randomized controlled trials and meta-analyses have explored the effects of various probiotic strains (such as Lactobacillus and Bifidobacterium) on allergic rhinitis symptoms. The proposed mechanism involves modulation of the immune system, particularly a shift from a Th2-dominated response (which promotes allergic reactions) toward a more balanced Th1/Th2 response, as well as enhancing regulatory T cell function. Some clinical studies have reported that probiotic supplementation can reduce nasal symptoms, decrease the need for allergy medications, and improve quality of life during pollen seasons. However, results across studies are variable, with some trials showing significant benefits and others showing little or no effect. The effectiveness appears to depend on the specific probiotic strain, dose, duration of use, and characteristics of the patient population. Systematic reviews, such as those published in Allergy (2015) and Clinical and Experimental Allergy (2016), conclude that while there is some evidence of benefit, the heterogeneity of studies and modest effect sizes warrant cautious interpretation. Overall, there is moderate scientific evidence (hence a rating of 3) supporting the use of probiotics in allergic rhinitis, but further well-designed studies are needed to clarify which strains and regimens are most effective.

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