Common Food Allergy Causes, Symptoms And Hidden Triggers Onions, peppers, berries, and parsley all have quercetin. Elson Haas, MD, who practices integrative drugs, says quercetin is a pure plant chemical. According to Haas, this chemical may cut back “histamine reactions.” Histamines are a part of the allergic response. Prednisone https://shintaroa443zqi3.blogmazing.com/profile