n-acetyl cysteine replenishes glutathione The Central Nervous System Modulatory Activities of N-Acetylcysteine: A Synthesis of Two Decades of Evidence The Yack on NAC (N-Acetyl-Cysteine)
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And hes correct, there is not a direct study to substantiate every single drug I listed because Im thinking several metabolic steps ahead of the actual depletion

Cell Death Dis (2018) 9(8):841

We then synthesized more than 3,000 TM-7 analogs in parallel and screened each crude product for degradation of HiBiTENL (Fig

[PubMed] [Google Scholar] Pawlowska E, Szczepanska J, Blasiak J
(preprint)
