Int J Sport Nutr Exerc Metab 2011;21:55-64.CloseHay FeverDose: Refer to label instructionsIn a double-blind trial, supplementation with a specific probiotic strain (Bifidobacterium longum strain BB536) during the pollen season significantly decreased symptoms such as sneezing, runny nose, nasal blockage, compared with a placebo.1References1.