Glutathione

Glutathione is a tripeptide of glutamate, cysteine, and glycine. Its cysteine residue carries a thiol group that donates electrons to neutralize reactive oxygen species — the unstable molecules produced by normal metabolism that damage cellular structures over time. It also participates in phase II liver conjugation, the process by which the body binds compounds for elimination, and is associated with tyrosinase activity, the enzyme governing melanin production, which is the basis for its long-standing use in skin clarity protocols. GHK-Cu operates on the structural side: it is a copper-binding tripeptide associated with collagen and elastin synthesis and with tissue remodeling signaling. Antioxidant capacity and structural rebuilding are separate mechanisms, which is the rationale for running them together.

Glutathione’s role as the body’s primary intracellular antioxidant is textbook biochemistry, and its decline with age and oxidative stress is well documented. The delivery question is where the research matters most: oral glutathione has historically shown poor bioavailability because it is broken down in digestion, though some longer-term oral studies have shown modest increases in body stores. Injection bypasses that pathway and raises circulating levels directly, which is the rationale for the injectable route. The skin-clarity use comes from glutathione’s association with tyrosinase activity and the melanin pathway; the human studies here are small and mixed, and results vary considerably. GHK-Cu’s association with collagen synthesis and tissue remodeling is well characterized in cell and wound-healing research, with most human data in topical form. Injectable GHK-Cu is not an FDA-approved product.