Your production of glutathione is low when conditions are normal
Notably, in these studies, the upregulation of GPx4 has been achieved by using exogenous agents (like NVP-AUY922, Bafilomycin A1, PD151746, GsMTx4, epigallocatechin-3-gallate, total flavonoids of Engelhardia roxburghiana leaves, Lycium barbarum polysaccharide-glycoprotein, perillaldehyde, melotonin, ferulic acid, and sphingosine-1-phosphate) which either inhibit the degradation of GPx4 or increase its transcription by activating the Nrf2 [67]
THE LANDMARK TRIAL PENN STATE, 6 MONTHS, PEER-REVIEWED: A 6-month randomized, double-blind, placebo-controlled human trial of 54 adults at Penn State University (Richie et al., European Journal of Nutrition, 2015) found that oral Setria L-Glutathione at 250 mg/day produced significant increases in whole-blood glutathione levels at 1, 3, and 6 months versus baseline establishing for the first time that oral glutathione is bioavailable in humans
10.3892/ol.2012.931 Oncol Lett