Allergic reactions are caused by inflammatory responses against harmless environmental substances.
According to several animal studies, kefir could eliminate these anti-inflammatory responses and therefore improve allergy and asthma symptoms.
However, human studies still need to be conducted to determine whether the effects of kefir on allergy and asthma are the same.
References:
1. https://www.ncbi.nlm.nih.gov/pubmed/21535502
2. https://www.ncbi.nlm.nih.gov/pubmed/22242953
