After entering the cell, cystine is oxidized to cysteine, which is ultimately synthesized into glutathione (GSH) by glutathione synthetase and glutamate-cysteine ligase
In this study, motor capacity enhanced from 44 to 71% in average (98)
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Beyond sleep, glycine also modulates glutamate, helping to balance excitatory and inhibitory neurotransmission, a core mechanism in anxiety and mood regulation: Animal studies suggest thatit reduces corticosterone, a key stress hormone
"The role of glutathione in photosynthetic organisms: emerging functions for glutaredoxins and glutathionylation" (PDF)