GHK-Cu is a rare grey-market peptide with genuinely strong topical evidence behind it — decades of published dermatology research and real randomized trials on skin and wound healing. The injectable, systemic anti-aging version sold today is a different claim entirely, resting on animal data and gene-expression studies that were never designed to prove what the injection ads imply.
Copper-Peptide
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GHK-Cu: The Copper Peptide and the Injectable Leap