A lot of that confusion clears up when you understand what's happening at the cellular level
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127,128,129,130 The resulting glutathione persulphide is a substrate for either persulphide dioxygenase, which oxidises the sulphane sulphur yielding sulphite and glutathione, or rhodanese, which generates thiosulphate
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Strikingly, the study revealed that the immune cells of these patients act as an "energy sink." In a desperate attempt to survive the overwhelming oxidative stress, the immune cells upregulate their own intracellular glutathione production
Cysteine is the most limiting building block: those who eat little protein, or follow a diet poor in cysteine sources such as eggs, meat and legumes, give the body less raw material to work with