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A vital contribution of the TSS pathway in sustaining cysteine levels is detected only under hemin exposure or physiological but not supraphysiological cystine supplement

In vitro stability studies show KPV maintains structural integrity in simulated gastric fluid (pH 1.2) for 24 hours and in simulated intestinal fluid (pH 6.8) for 68 hoursproperties that make oral delivery feasible without enteric coating in some formulation designs

I think vitamin C has contributed a large part to that

Using bacteriostatic water rather than sterile water extends shelf life after reconstitution due to the preservative (benzyl alcohol) that inhibits microbial growth