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Glutathione regulates metabolism of vitamins D, E, and C, earning its designation as the master antioxidant. Age-related GSH decline occurs commonly in advanced age, with defective renal glutathione metabolism marking renal aging

While glutathione is naturally produced by your body and oral supplements are broadly safe, certain groups should either avoid supplementation entirely or use it only under medical supervision: 1

Purity, identity, peptide content, water, counter-ions, and residual solvents are separate quality items and should not be treated as one number

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Chemico-Biol Interact 231:98107 Niki E (2009) Lipid peroxidation: physiological levels and dual biological effects