intravenous glutathione for liver Changes in Content in Diseases: An Update Benefits of Glutathione
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Comparison of retention following intramuscular injection of cyanocobalamin and hydroxocobalamin

Still, peptides can influence hormone pathways, so they should not be treated like casual supplements

Hull M, Glazener C, Kelly N, Conway D, Foster P, Hinton R, et al

Together with the fact that the intestinal lumen diameter is much greater in humans than in mice, this observation suggests that pharmacological claudin-2 channel inhibition is unlikely to cause intestinal obstruction in humans
