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doi: 10.1016/j.fct.2010.10.006

An article in the "Journal of Hepatology" describes how glutathione supplementation can protect against toxin-induced liver damage and improve liver function in patients with chronic liver disease

GHK-Cu is more studied for skin applications (collagen, anti-aging)

10.3390/ijms22147582 48 HackettP

The other is to actively utilize the hypoxic microenvironment to design prodrugs that selectively intensify local oxidative pressure [487]

This article covers the pharmacology of both compounds, what glutathione actually does in the body versus what it's marketed to do, and the specific scenarios where combining them might make clinical sense