Source Naturals Aller-Response 90 Tabs Dietary supplement. Quercetin, Ginkgo & Synephrine. Aller-Response is a seasonal formula featuring quercetin. Human cell culture studies with quercetin demonstrated its capability to inhibit the release of histamines. Ginkgolide B, in human cell culture studies, was found to be a potent inhibitor of platelet-activating factor, a substance that stimulates the release of histamine from immune cells. Vitamin A and Vitamin C, along with the mineral zinc, help support the immune system. (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease.) Contains no yeast, dairy, egg, preservatives, or artificial color, flavor or fragrance. Features: Source Naturals Source Naturals Aller-Response 90 Tabs Product Details: Product Dimensions: 2.4 x 2.4 x 4.4 inches ; 6.6 ounces Shipping Weight: 4.8 ounces UPC: 021078010951 Item model number: 021078010951