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Whether injected, oral, or intranasal GHK-Cu would replicate the gene expression changes seen in cell culture studies in living humans is unproven

They point to the also potency of lifestyle factors like exercise and caloric restriction, eating mostly non-processed foods, et cetera, as a "better alternative." I'm not necessarily saying that

European Journal of Endocrinology, 167(4), 465-471

The Critical Problem: No Human Clinical Evidence As of early 2026, not a single randomized controlled trial (RCT) has been completed and published for human musculoskeletal indications