Though it is found in every cell, glutathione cannot penetrate cell walls, thus it cannot be externally supplemented, and it must be biosynthesized inside the cell
PMID: 40278267 Int J Mol Sci MTX-211 Inhibits GSH Synthesis through Keap1/NRF2/GCLM Axis and Exerts Antitumor Effects in Bladder Cancer
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