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Can GHK-Cu penetrate the skin barrier to reach the hair follicle cells
Reintroduce at 2 applications per week, give it 12 weeks, and judge results from photos rather than from how the skin feels day to day
Kharas MG, Lengner CJ
ACL reconstruction (rat model): Intra-articular GHK-Cu injections at 0.3-3 mg/mL transiently improved knee laxity outcomes at 6 weeks post-surgery, though improvements were not sustained at 12 weeks (PMID 25731775)
Expecting visible changes in the first 1-2 weeks sets unrealistic expectations
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