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The key distinction: the drug must be FDA-approved for something

Oral glutathione is largely degraded in the gastrointestinal tract before it reaches systemic circulation

[DOI] [PubMed] [Google Scholar] Van Schooten FJ, Besaratinia A, De Flora S, DAgostini F, Izzotti A, Camoirano A, Balm AJ, Dallinga JW, Bast A, Haenen GR, Vant Veer L, Baas P, Sakai H, Van Zandwijk N

In addition, Pefabloc TH benzamidine is specific for thrombin, and Pefabloc FXa is specific to factor Xa
