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The human gastrointestinal tract contains significant amounts of the enzyme GGT, which recycles GSH precursors and may prevent significant intact absorption of GSH per se from oral supplementation

Southward, Ethnicity and the Mixed Marriage Crisis in Ezra, 910: An Anthropological Approach, Oxford University Press 2012 pp.103203, esp

Purified Flag-GCLC or recombinant GST-GCLC protein was incubated with a gradient concentration of succinyl-CoA in succinylation buffer, followed by western blotting analysis using an antibody against succinylated lysine (K)

If that conjures up an unpleasant image of gut materials leaking in to your bloodstream, you are not far off