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Glutathione (GSH) is known to be in high concentrations within the epithelial lining fluid (ELF) of the lower respiratory tract, which refers to the layer of cells which first come into contact with inhaled air

Provides supplementation of Vitamin B12 for up to 6 months in sheep and 3-4 months in calves

[DOI] [PubMed] [Google Scholar] 270.Tong A., Wu L., Lin Q., Quek C.L., Zhao X., Li J., Chen P., Chen L., Tang H., Huang C., et al

[DOI] [PMC free article] [PubMed] [Google Scholar] 28.Ruell J

Until recently intravenous delivery of glutathione has proven to be the most effective route for absorption, but this method is both costly and impractical