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Where to purchase GHK-Cu copper peptides Topical GHK-Cu can be found in a multitude of over-the-counter cosmetic products, both brick-and-mortar and online

When a destructive free radical threatens a cell, reduced glutathione directly donates a reducing equivalent (an electron or hydrogen atom) to neutralize the threat

Candidate pathways Enzyme-independent oxidation Because GSH oxidation is strongly dependent on deprotonation to the thiolate form (GS), electron transfer is pH-dependent

A 2025 study published in Frontiers in Pharmacology examined GHK-Cu's effects in a colitis model, finding that it modulated SIRT1 and STAT3 signaling in colon tissue a reminder that this peptide's research footprint extends well past skin and hair into broader inflammatory and metabolic pathways