Allergy Research Quercetin 300 formulation incorporates the highest potency Quercetin available. It is derived from a non-citrus, hypoallergenic plant source and stabilised with additional antioxidants so as not to auto-oxidise (degrade spontaneously). Quercetin has been shown to support the integrity of mast cells, which play a key role in controlling the release of histamine. In addition, Quercetin has been shown to reduce the production of prostaglandins and leukotrines.Suggested Use:As a dietary supplement, 1 or 2 capsules one to three times daily with meals, or as directed by a health practitioner.Ingredients: Vitamin C (as Calcium Ascorbate); 75 mg Vitamin E (as DL-alpha-Tocopheryl Acetate); 70 IU Quercetin; 300 mg Other ingredients: Hydroxypropyl methylcellulose, cellulose, L-leucine.These nutrients are of the highest quality and purity obtainable, free of all common allergens (antigens), and do not contain preservatives, diluents, or artificial additives.