A recent study suggests that probiotics could help to reduce seasonal allergy symptoms. Published through the International Forum of Allergy & Rhinology and led by Dr. Justin Turner of Vanderbilt University Medical Center, the study reviewed the results of 23 previous trials in which more than 1,900 people consuming probiotics were compared to those taking placebos.
17 of these trials found that subjects who took probiotic supplements or consumed probiotic-rich foods experienced reduced allergy symptoms or improved quality of life. Six of the trials did not yield results suggesting probiotics are effective in this regard.
Scientists theorize that probiotics may help to prevent the immune system from triggering an allergy attack by "chang[ing] the balance of bacteria in the intestines."
Although the results of this study are promising, Dr. Turner stresses that scientists still do not completely understand how probiotics interact with the immune system, mentioning that the 23 studies "used different strains of live bacteria, different dosages, and different probiotic supplement formulations over different periods of time." He says that further research is needed before doctors will know if and how they should recommend probiotics to allergy sufferers. Turner also believes that even if probiotics can be used to treat allergies, patients will probably still need to take traditional allergy medications like antihistamines.
Probiotics, or "good bacteria," are believed "to help maintain a healthy gut" and improve mental health. They are found in foods like kefir, yogurt and sauerkraut, and can also be taken as supplements.
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