GHK-Cu is a research compound studied for its role in cosmetics peptides research. This page covers mechanism of action, published studies, preclinical protocols, and analytical specifications.
Gly-His-Lys + Cu²⁺ (copper(II) ion chelated at histidine imidazole and lysine amino groups)
Physical Form
Lyophilized powder
Purity (QSC)
≥99%
Storage
Store lyophilized at -20°C. Reconstituted: 4°C, use within 28 days.
Reconstitution
Add 2ml bacteriostatic water or PBS per vial. Swirl gently. Solution may appear light blue due to copper complex — this is normal.
Mechanism of Action
GHK-Cu (Glycyl-L-Histidyl-L-Lysine:Copper(II)) is a naturally occurring tripeptide-copper complex found in human plasma (~200 ng/ml at age 20, declining to ~80 ng/ml by age 60), saliva, and urine. First isolated by Loren Pickart in 1973 while studying plasma factors that stimulated liver cell growth, GHK has since been identified as a pleiotropic biological signal with broad tissue remodelling activity.
Copper Ion Delivery and Enzyme Activation: GHK-Cu chelates copper(II) ions with high affinity, serving as a copper transport complex. Intracellular copper delivery activates copper-dependent enzymes including lysyl oxidase (cross-linking of collagen and elastin), cytochrome c oxidase (mitochondrial electron transport), superoxide dismutase (antioxidant defence), and dopamine-β-hydroxylase. This copper delivery mechanism underlies several of GHK-Cu’s observed biological effects.
Fibroblast Activation and Extracellular Matrix Remodelling: GHK-Cu activates dermal fibroblasts, stimulating production of collagen I, III, and IV, elastin, fibronectin, and proteoglycans (decorin, versican). Simultaneously, it modulates matrix metalloproteinase (MMP) activity — upregulating MMPs that degrade damaged/cross-linked matrix while promoting their inhibitors (TIMPs) to prevent excessive degradation. This balanced MMP/TIMP regulation is proposed to facilitate matrix remodelling rather than pure accumulation.
Antioxidant Gene Upregulation: Research has documented GHK-Cu’s ability to upregulate expression of antioxidant genes including SOD1, SOD2, and catalase through modulation of NFE2L2 (Nrf2) transcription — the master antioxidant response regulator. This gene-level effect is separate from the direct copper-SOD enzyme activation.
TGF-β and Wound Healing Signalling: GHK-Cu modulates TGF-β signalling in a context-dependent manner — promoting TGF-β in early wound healing phases (where it stimulates collagen synthesis and cell migration) while potentially dampening TGF-β in late phases (where excessive TGF-β promotes fibrosis). This dual regulation is proposed to explain GHK-Cu’s observed effects on both wound healing acceleration and anti-scarring research outcomes.
Research Applications
Dermal Wound Healing Research: GHK-Cu is extensively studied in skin wound healing models — both in vitro (fibroblast scratch assays, collagen gel contraction) and in vivo (full-thickness wound excision in rodents) for effects on re-epithelialization, collagen deposition, and wound tensile strength.
Skin Anti-Aging Mechanism Research: Age-related decline in plasma GHK levels correlates with skin aging phenotypes. Research uses GHK-Cu to examine whether restoring GHK-Cu exposure reverses aging-associated fibroblast senescence, collagen decline, and matrix degradation.
Antioxidant Gene Expression Studies: GHK-Cu’s Nrf2 pathway activation makes it a research tool for studying the gene-level antioxidant response, with applications in oxidative stress models including UV damage, pollution exposure, and inflammatory skin conditions.
Hair Follicle Research: Studies in hair follicle culture systems have examined GHK-Cu’s effects on follicle growth phase duration and dermal papilla cell proliferation — relevant to alopecia research.
Nervous System Research: Emerging research has examined GHK-Cu in neuronal models, particularly its neurotrophic factor-related gene expression effects, as GHK-Cu has been identified as a modulator of BDNF and NGF signalling in some cell models.
Key Published Research
Primary publications relevant to GHK-Cu research. Full citations available via PubMed. QSC does not endorse or make claims based on this research.
Pickart et al. (2015)
“The Human Tripeptide GHK-Cu in Prevention of Oxidative Stress and Degenerative Conditions of Aging” — Rejuvenation Research
Comprehensive review of GHK-Cu’s biological activity across wound healing, antioxidant gene regulation, and anti-aging mechanisms.
Finkley et al. (1997)
“Activation of Wound Healing Processes by GHK-Cu in Normal Human Fibroblasts” — Journal of Biomaterials Science, Polymer Edition
Characterises GHK-Cu’s fibroblast activation and collagen synthesis stimulation in a controlled in vitro wound healing model.
Pickart & Margolina (2018)
“Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data” — International Journal of Molecular Sciences
Reviews genome-wide gene expression data showing GHK-Cu’s broad upregulation of antioxidant, anti-inflammatory, and tissue remodelling genes.
24–48h; RT-qPCR for SOD1, SOD2, CAT, Nrf2 target genes
Frequently Asked Questions
What is GHK-Cu?
GHK-Cu (Glycyl-L-Histidyl-L-Lysine:Copper) is a naturally occurring tripeptide-copper complex found in human plasma. It activates fibroblasts, promotes collagen and elastin synthesis, upregulates antioxidant genes, and modulates wound healing signalling. Research has also documented its hair follicle and potential neurological applications.
Is GHK-Cu a peptide or a copper supplement?
It is both — a peptide-copper complex. The GHK tripeptide (Gly-His-Lys) chelates copper(II) ions, serving as both a biological signalling peptide and a copper delivery vehicle. The copper component is essential for its enzyme-activating effects; the peptide provides biological specificity and cellular targeting.
Why does reconstituted GHK-Cu solution appear blue?
The blue colour is from the copper(II) ion in the chelate complex — the same reason copper sulfate solutions are blue. This is normal and expected for GHK-Cu. The intensity may vary with concentration and pH.
What is the difference between GHK-Cu and AHK-Cu?
AHK-Cu (Ala-His-Lys:Cu) is a structural analog of GHK-Cu with alanine at the N-terminus instead of glycine. AHK-Cu has been studied for similar fibroblast-activating and hair follicle effects, with some research suggesting more potent hair follicle growth stimulation. Both are copper peptide complexes in the same research family.
What purity is QSC GHK-Cu?
≥99% by HPLC and mass spectrometry. COA published on product page, verifiable via Janoshik.
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