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Description
Prolonged exposure to tobacco smoke, air pollution, pathogens and/or other risk factors submits lungs to a pro-oxidative environment, correlates with a functional decline of the lung epithelium 2,3,4 and can actively contribute to neoplastic transformation

2013 Aug;72(2):30514

Vitamin B12 deficiency associated with metformin use is thought to be multifactorial

[PubMed] [Google Scholar] 44.Iavazzo C., Athanasiou S., Pitsouni E., Falagas M.E

This means the cell never receives glutathione itself
