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Similarly, xanthine oxidase, an enzyme involved in purine metabolism, can generate superoxide and hydrogen peroxide as by-products, particularly under conditions of oxidative stress or tissue damage [48]

However, the preceding sections of this paper establish that GSH is not merely a passive antioxidant, but an immune regulator and modulator with actions dependent upon the pathophysiologic context (Ghezzi, 2011) GSH acts to regulate the thresholds necessary for immunologic activation through redox-sensitive signal transduction pathways, influences antigen presentation and the development/differentiation of immune cells, and modulates the production of cytokines

In: RubinRHYoungLSVan FurthR, editors

Liposomal Glutathione Benefits & Uses: Liposomes protect glutathione from degradation by stomach acid allowing greater amounts to enter the bloodstream