glutathione is converted from Metabolism - an overview GLUTATHIONE SYNTHESIS - PMC
Description
Cystine appeared to be the main regulator of GSH homeostasis (among other amino acids), since cystine deprivation alone reduced intracellular GSH and it was not further aggravated by depletion of other amino acids

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Structural mechanisms of cyclophilin D-dependent control of the mitochondrial permeability transition pore

Reduced glutathione (GSH) is a tripeptide comprised of glutamic acid, cysteine, and glycine that is synthesized de novo from its constituent amino acids via two adenosine triphosphate (ATP)-dependent enzymatic reactions
