A living research greenhouse / Copper Tripeptide-1
GHK-Cu is a copper peptide studied for skin, hair, and wound-healing research across five decades.
A bright, cited digest of what the published literature has actually grown — the collagen dose-response, the gene-expression signature, the angiogenesis data, and the honest gaps — with every quantitative claim sourced.
What the GHK-Cu literature describes
GHK-Cu is a copper-binding tripeptide that, in study models, makes aged tissue behave more like young tissue. It stimulates dermal fibroblasts to synthesize collagen, elastin, and glycosaminoglycans [1][6], drives VEGF- and FGF-2-mediated angiogenesis during wound repair [6][7], supports hair-follicle activity [4], and shifts roughly 31% of human genes toward DNA-repair, antioxidant, and tissue-remodeling programs [2]. It was first isolated from human plasma by Loren Pickart in 1973 as the factor that caused aged liver tissue to make proteins like younger tissue.
The molecule is glycyl-L-histidyl-L-lysine chelated 1:1 to a copper(II) ion. Its molecular weight is 402.92 Da; its CAS number is 89030-95-5; its cosmetic-ingredient name is Copper Tripeptide-1. The GHK sequence is not foreign chemistry — it occurs naturally inside the alpha-2(I) chain of type I collagen and in the matrix protein SPARC, and it circulates in human plasma, saliva, and urine. Plasma GHK declines with age, from about 200 ng/mL at 20 years to about 80 ng/mL by 60 [3].
This site reads that record plainly. The strongest evidence is preclinical and topical-cosmetic; the controlled human data are thinner, and we name where they stop. What follows is organized by what the studies measured: how GHK-Cu works, the copper peptide skin research, the copper peptide hair growth evidence, and the GHK-Cu wound-healing research that anchors much of the mechanism.
What a Copper Peptide Is
A copper peptide is a short chain of amino acids bound to a copper(II) ion, where the copper is not incidental but central to the molecule's documented activity. GHK-Cu is the archetype: three amino acids (glycine, histidine, lysine) coordinate a single copper atom through the histidine imidazole, the glycine amino nitrogen, and a deprotonated amide nitrogen, leaving the lysine side chain free.
The copper does real work. It enables lysyl-oxidase-dependent cross-linking of collagen and elastin, contributes superoxide-dismutase-like antioxidant activity, and is delivered into tissue as a controlled payload rather than free, pro-oxidant copper [6]. The chelate's stability constant is very high (log K around 16.4), which is why the bound copper stays bound and does not behave like loose copper salt.
GHK Copper Peptide: What the Research Describes
The GHK copper peptide sits at the intersection of two research lineages: dermatology, where topical Copper Tripeptide-1 has decades of cosmetic use and small placebo-controlled trials, and tissue engineering, where GHK-functionalized biomaterials are tested as wound dressings and scaffolds. Across both, the recurring finding is matrix synthesis. In human fibroblast cultures, GHK-Cu stimulated collagen production at picomolar-to-nanomolar concentrations, independent of any change in cell number — a specific metabolic signal, not a growth artifact [1].
The pleiotropic profile is documented in a foundational tissue-remodeling review: GHK-Cu increases collagen, elastin, metalloproteinases and their inhibitors, VEGF, FGF-2, and nerve growth factor, while suppressing free radicals, TGF-beta-1, and TNF-alpha, and chemoattracting the macrophages and capillary cells that rebuild tissue [6]. That breadth is the reason the same molecule appears in skin, hair, and wound literatures at once.
Researched Effects of Copper Peptides
The benefits attributed to copper peptides in the literature are best read as study outcomes, not promises. In skin, GHK-Cu stimulates synthesis of collagen, dermatan and chondroitin sulfate, and decorin, with topical formulations improving density, firmness, fine lines, and wrinkle depth in small placebo-controlled trials [3]. One comparison reported topical GHK-Cu increased procollagen synthesis in about 70% of subjects, versus 50% for vitamin C and 40% for retinoic acid [3][14].
In wound models, GHK-Cu accelerates closure and angiogenesis: a 2025 food-derived GHK-Cu self-healing hydrogel reached over 95% infected-wound closure by day 12 in mice, versus about 65% in controls, while reducing IL-6 and TNF-alpha [15]. In hair research, a six-month trial of a GHK-containing topical produced significant hair-count gains over placebo [4]. Each of these is a measured endpoint in a specific model, cited and bounded.