Here is a complete account: Excess free copper toxicity: At supraphysiological concentrations, free copper is pro-oxidant
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First, as a precursor of glutathione (GSH), NAC transforms into GSH, which exhibits significant antioxidant effects
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This enzyme is, however, highly expressed in human liver, testes, and kidney (7)
However, the actual absorption of glutathione from food by the human body remains uncertain, with experts suspecting poor bioavailability, meaning only a small portion is absorbed and active