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Finally, administration of glutathione precursors such as whey protein, vitamin C, and glutamine, which are often recommended to boost glutathione levels in the body, typically does not raise the level of glutathione by a significant amount, require high doses to be effective, and cost significantly more than an equivalent amount of glutathione

World journal of hepatology , 6 (3), 144149

Contrary to expectations, the tripeptide has extremely low bioavailability through injections

Publications Citing Use of MedChemExpress (MCE) L-Glutathione reduced More Signal Transduct Target Ther

Prevents continued benefit and requires cycling to restore normal sensitivity

National Cancer Institute