According to WebMD, probiotics (“good” bacteria found in supplements and foods like yogurt) can change your immune system’s response to pollen.
In the future, probiotics may constitute another treatment option for the 40 million Americans who suffer from hay fever, or seasonal allergies. When ingested, probiotics join other microorganisms in the gut, where the majority of your immune system is located. Changes in intestinal bacteria have been linked to certain allergic disorders, and this prompted researchs to look at probiotics. Read more about probiotics and allergies