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Great sources for reading  https://www.hindawi.com/journals/bmri/2015/648108/ https://www.hindawi.com/journals/bmri/2014/151479/. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6073405/ http://www.skinbiology.com/Articles/AntiAgingActivityofGHK_JARCPFinal.pdf https://www.semanticscholar.org/paper/GHK-–-Copper-Peptide-in-Skin-Remodeling-and-!-in-Pickart/56992fa05930e1f6a22c3d84f80ff8ac6774f72b?p2df https://pubmed.ncbi.nlm.nih.gov/28370978/ https://www.walshmedicalmedia.com/open-access/effects-of-ghkcu-on-mmp-and-timp-expression-collagen-and-elastin-production-and-facial-wrinkle-parameters-2329-8847-1000166.pdf https://pubmed.ncbi.nlm.nih.gov/27517151/ https://www.mdpi.com/2079-9284/2/3/236/htm https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4556990/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4508379/