The optimal stability range for these formulations is pH 6.07.5 , with maximum methionine oxidation rates for the parent protein occurring at pH 6-7
References 1 AbdullahiW.TripathiD.RonaldsonP
These two forms are continuously interconverted in the body, driving metabolic processes
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NIH, National Library of Medicine, PubMed - Glutathione and its antiaging and antimelanogenic effects 5