is 8 grams of intravenous glutathione Full article: Development and characterization glutathione-conjugated albumin nanoparticles for improved brain delivery of hydrophilic fluorescent marker Glutathione Injection: Benefits, Safety, & – Intravenous glutathione should not be

Overall, propylene glycol is a well-studied ingredient that most people can tolerate without issue

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2013 Mar;49(5):1058-64

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Anderson JM, Van Itallie CM (1995) Tight junctions and the molecular basis for regulation of paracellular permeability