Probiotics could help with hay fever symptoms

A large number of studies have shown that probiotics reduce the severity of hay fever. Scientists now suspect that a lack of beneficial bacteria in the gut can lead to a variety of allergies. They think that if these bacteria are lacking, the immune system can be sent into overdrive by allergens such as pollen, dust mites and animal hair.

http://news.vanderbilt.edu/2015/05/study-shows-probiotics-may-help-ease-allergies