If he tests positive for MTHFR could this be related
However, the expression of GPx1 has been reported to be down-regulated in thyroid cancer [44], colorectal cancer [45, 46], and gastric cancer [47], whereas GPx1 has been demonstrated to play an oncogenic role in kidney cancer [48], pancreatic cancer [49], and laryngeal squamous cell carcinoma [50]

certificate of analysis available on request Research Applications Suitable Laboratory Uses for Glutathione Intracellular GSH/GSSG ratio measurement and cellular redox status studies Oxidative stress rescue and GSH repletion assays following BSO-mediated depletion Glutathione peroxidase (GPx) and glutathione reductase (GR) enzyme activity assays Glutathione S-transferase (GST) detoxification and xenobiotic conjugation pathway studies S-glutathionylation and redox-regulated post-translational modification research Nrf2/ARE pathway research transcriptional regulation of antioxidant gene expression Mitochondrial GSH pool depletion and mitochondrial oxidative damage studies Cancer cell biology GSH-dependent drug resistance, ferroptosis (GPx4-GSH axis), prodrug activation Neurodegeneration pathway research GSH depletion in dopaminergic and neuronal cell models Immune cell function T-cell proliferation, cytokine production, and inflammatory signalling studies Lipid peroxidation pathway research GSH interactions with vitamin E, vitamin C, and peroxyl radicals Structureactivity relationship (SAR) studies across GSH analogues and mimetics Molecular analysis and controlled laboratory experiments Why Buy Glutathione in the UK from Peptides Lab UK

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Mol Microbiol (2006) 61(4):84760
TAS, total antioxidant status