n acetylcysteine precursor to glutathione Existing and potential therapeutic uses for N-acetylcysteine: The need for conversion intracellular for antioxidant benefits N-Acetylcysteine and Its Immunomodulatory Properties

[114], in Zucker fatty versus lean rats, showed that the increased circulating concentration in BCAA that results from the reduced activity of the complex branched-chain keto acid dehydrogenase (BCKDH) in the liver [115,116] directly affects skeletal muscle amino acid metabolism following compensatory upregulation of BCKDH activity in that tissue

Studies in rat MCAO models have shown elevated lipid peroxidation levels and reduced GSH levels (Milln et al., 2021)

So the right question is never "is IV more powerful?" It is "does the gut's limit actually matter for this nutrient, in this patient, at this dose?" For a handful of scenarios the answer is clearly yes glutathione, high-dose vitamin C, and true malabsorption are the textbook examples

Rumjit, Microb