For GHK-Cu, the best-supported claims come from topical and wound-related evidence, while injectable and systemic claims need more rigorous human data [2], [3], [8]
Injections raise levels more effectively than most oral forms, under medical supervision
The real decision comes down to absorption quality, your timeline for results, and the specific health outcomes you want achieved
10.2147/DDDT.S332847 84 HeY.FangD.LiangT.PangH.NongY.TangL.et al (2021b)
[5] The peptide was observed to induce greater results than the control group exposed to a solution of Vitamin C and Retinoic Acid
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