Quercetin 300 60 caps from NutriCologyQuercetin 300 This formulation incorporates the highest potency quercetin available, derived from a non citrus, hypoallergenic plant source, and stabilized with additional antioxidants so as not to auto oxidize (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