1 00:00:00,000 --> 00:00:04,250 One letter changes, and the evidence changes with it. 2 00:00:04,250 --> 00:00:08,917 GHK-Cu and AHK-Cu are related copper-binding peptides, not interchangeable treatments. 3 00:00:08,917 --> 00:00:15,167 GHK-Cu has laboratory work on collagen production in fibroblasts, cells involved in connective tissue. 4 00:00:15,167 --> 00:00:19,417 That finding is a starting point for skin research. 5 00:00:19,417 --> 00:00:25,667 A frequently cited AHK-Cu study tested isolated human hair follicles and cultured follicle cells. 6 00:00:25,667 --> 00:00:31,542 Hair growth outside the body is not a clinical trial for hair loss. 7 00:00:31,542 --> 00:00:35,792 Neither study shows which peptide is better in people. 8 00:00:35,792 --> 00:00:42,042 Formulation and delivery matter, and topical cosmetic evidence cannot be carried over to injections. 9 00:00:42,042 --> 00:00:46,708 Compare the actual study, not the similarity of the names.