Because glutathione levels decline as you age, and glycine can help slow the glutathione slide, it's a good idea to keep your levels high by eating protein rich foods, like organic poultry, grass fed Glutathione Depletion and Stalwart Anticancer Activity of Metallotherapeutics Inducing Programmed Cell Death: Opening a New Window for Cancer Therapy ACS Omega Frontiers Glutathione responsive and exhausting metal nanomedicines for robust synergistic cancer therapy Glutathione in cancer progression and chemoresistance: an update in: Redox Experimental Medicine Volume 2023 Issue 1 (2023) Glutathione peroxidase 2 is a metabolic driver of the tumor immune microenvironment and immune checkpoint inhibitor response Journal for ImmunoTherapy of Cancer How Does Glutathione Affect Cancer Risk and Treatment?