Quercetin is a naturally occurring bioflavonoid with exceptional antioxidant activity. This activity supports the body’s gastrointestinal tract by preventing oxidation of lipids, which is important because these cell walls serve as part of the body’s immune system. Quercetin is also considered a phytoestrogen (i.e, a plant substance with similar functions as that of estrogen). Some phytoestrogens are believed to have anti-estrogenic effects which can help with the body’s overall immune health. Lastly, Quercetin has been shown to prevent the depletion of Glutathione from the cells of the intestinal tract. By preserving the level of glutathione, it protects metabolic activity and cellular structure of vulnerable cells in the gastrointestinal tract from free radical damage.