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Copper is silenced: The copper tripeptides copper is tightly bound (stability constant log K = 16.44) and not freely available to catalyze oxidation reactions

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Denis, Effects of N-acetylcysteine, oral glutathione (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover study., Redox Biology, Volume 6, 2015, Pages 198-205, ISSN 2213-2317

The takeaway across the whole timeline is simple

5 million cells were used for the GSH assay after lysing by sonication (20 kHz, 70% amplitude, 2 10 s)
