In a recently published article in the May issue of the Journal of Allergy and Clinical Immunology, Hortensia Moreno-Macias reports that her review of published studies indicates that there is no clear evidence of a relationship between the use of antioxidant supplements and other dietary supplements and a decrease in allergies or asthma.
Oxidative stress stimulates the inflammatory responses that can lead to allergic diseases such as asthma, allergic rhinitis, atopic dermatitis, 
and food allergies. The conventional wisdom holds that antioxidants would relieve this oxidative stress. However, a review of the published studies does not show this to be the case. So much for conventional wisdom!
In short, while there was no compelling evidence that the use of fish oil, vitamin C, vitamin E, and other antioxidant supplements for asthma had a positive impact on allergies or asthma they found out that it didn’t harm either. The researcher recommends that in certain situations where antioxidants might not be available in the diet that supplements for asthma might be appropriate.
So, if you feel your diet is not complete and you want to take an antioxidant go ahead, just don’t expect it to help your allergies or asthma any more than eating a well-balanced diet.
Wishing you the best of health
Mike
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