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Clinical studies (Leyden, Pickart) also tested injectable forms 1 to 2 mg subcutaneously in wound-healing contexts

doi: 10.1016/j.molcel.2014.03.012 208 PciennikowskaAHromada-JudyckaABorzckaKKwiatkowskaK

Other mechanistic studies show that oral NAC is poorly absorbed with no renoprotective effects (53)

In research settings, GHK-Cu is associated with changes in gene-expression signaling linked to wound-healing cascades , angiogenesis , and extracellular matrix regeneration mechanisms that may contribute to improved skin texture, firmness, and overall structural support during recovery and rejuvenation-focused protocols