WILGO RESEARCH INDEX
GHK-Cu
GHK-Cu is the copper complex of the naturally occurring tripeptide glycyl-L-histidyl-L-lysine. Research spans fibroblast biology, collagen and glycosaminoglycan synthesis, wound-remodeling pathways, skin penetration, and topical clinical applications.
Copper-binding tripeptideDermal researchExtracellular matrixWound remodelingHuman topical evidence
EVIDENCE MAP
What kind of evidence exists?
GHK-Cu has a more varied evidence profile than many research peptides, but different evidence types still need to be kept separate.
Human evidence exists, but it is narrower than marketing language often suggests.
The literature supports real biological activity and some topical clinical study, but much of the mechanistic case comes from cultured cells, ex-vivo skin, animal models, or reviews. Combination formulations should not be treated as evidence for GHK-Cu alone.
PUBLISHED LITERATURE
Selected studies.
The studies below emphasize source quality and model clarity rather than promotional breadth.
HUMAN · RANDOMIZED CONTROLLED TRIAL
Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin
This randomized controlled trial evaluated skin-care products containing GHK-Cu after circumoral CO2 laser resurfacing. It is one of the stronger direct human clinical studies in the GHK-Cu literature because the intervention was tested prospectively in a defined post-procedure setting.
HUMAN SKIN · EX-VIVO
Human skin retention and penetration of a copper tripeptide in vitro
Using flow-through diffusion cells and human skin layers, investigators measured copper permeation and tissue retention after application of a GHK-copper complex. This study addresses delivery through human skin, not clinical effectiveness in patients.
IN-VITRO · COLLAGEN
Stimulation of collagen synthesis in fibroblast cultures by the tripeptide-copper complex GHK-Cu
In cultured fibroblasts, GHK-Cu increased collagen synthesis over a low-concentration range without an accompanying change in cell number. This is classic mechanistic evidence for extracellular-matrix effects, but it is not by itself a clinical skin-rejuvenation trial.
IN-VITRO · GLYCOSAMINOGLYCANS
Stimulation of sulfated glycosaminoglycan synthesis by GHK-Cu
Normal human fibroblasts exposed to GHK-Cu showed a dose-dependent increase in total glycosaminoglycan synthesis, with effects reported for dermatan sulfate and heparan sulfate. The work helps explain matrix-remodeling hypotheses at a cellular level.
IN-VITRO · IRRADIATED FIBROBLASTS
Effects of copper tripeptide on growth and growth-factor expression by normal and irradiated fibroblasts
Human dermal fibroblasts from irradiated and non-irradiated tissue were studied in serum-free conditions. GHK-Cu exposure accelerated fibroblast population growth and was associated with early increases in basic fibroblast growth factor and VEGF in irradiated cells.
IN-VITRO · COLLAGEN / PHOTOIRRADIATION
Copper peptide and LED photoirradiation in fibroblast collagen synthesis
Human fibroblasts were used to examine viability, type-I collagen-related measures, and basic fibroblast growth factor under LED photoirradiation with and without Cu-GHK. Because the experiment combines two interventions, it is most useful as mechanistic support rather than isolated proof of GHK-Cu efficacy.
REVIEW · TISSUE REMODELING
The human tri-peptide GHK and tissue remodeling
This review summarizes reported roles for GHK and GHK-Cu in fibroblast activity, collagen and elastin synthesis, metalloproteinases, angiogenesis, and wound remodeling. It also discusses controlled skin studies, but as a review it should not replace the underlying trial data.
REVIEW · SKIN REGENERATION
GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration
This review integrates GHK/GHK-Cu literature involving collagen, glycosaminoglycans, metalloproteinases, fibroblasts, and wound-healing pathways. Its broad claims are useful for mapping the field, but the evidentiary strength varies substantially across the studies it cites.
REVIEW · TOPICAL USE
Topically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospective
This recent review is particularly useful because it highlights an important limitation: despite widespread cosmetic use of GHK-Cu and related derivatives, published information on skin permeability, effectiveness, and physicochemical behavior remains incomplete.
CHEMISTRY
Compound identifiers.
The PubChem record is for the copper complex as represented in the database; commercial naming conventions can vary, so identity should be tied to the exact tested material.
PubChem record
PubChem CID 133697840 lists GHK-Cu with CAS 300801-03-0, molecular formula C28H48CuN12O8, and molecular weight 744.3 g/mol. The parent peptide is glycyl-L-histidyl-L-lysine (GHK), PubChem CID 73587.
REFERENCES
Primary sources.
WILGO links to PubMed, PMC, DOI records, or authoritative chemistry databases wherever practical.
PubChem. GHK-Cu, CID 133697840.Open source →
Miller TR et al. Effects of topical copper tripeptide complex on CO2 laser-resurfaced skin.PMID 16847171 · DOI 10.1001/archfaci.8.4.252 · PubMed →
Hostynek JJ et al. Human skin retention and penetration of a copper tripeptide in vitro.PMID 20703511 · PMCID PMC2945467 · DOI 10.1007/s00011-010-0214-4 · PubMed →
Maquart FX et al. Stimulation of collagen synthesis in fibroblast cultures by GHK-Cu.PMID 3169264 · DOI 10.1016/0014-5793(88)80509-X · PubMed →
Stimulation of sulfated glycosaminoglycan synthesis by GHK-Cu.PMID 1522753 · DOI 10.1016/0024-3205(92)90504-I · PubMed →
Effects of copper tripeptide on growth and growth-factor expression by normal and irradiated fibroblasts.PMID 15655171 · PubMed →
The human tri-peptide GHK and tissue remodeling.PMID 18644225 · PubMed →
GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration.PMID 26236730 · PMCID PMC4508379 · DOI 10.1155/2015/648108 · PubMed →
Topically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospective.PMID 39963574 · DOI 10.34172/bi.30071 · PubMed →
Research-use notice: This resource summarizes published scientific literature for informational and research-reference purposes. It does not provide medical advice, dosing, reconstitution, injection, therapeutic, diagnostic, or other human-use instructions. WILGO products are intended for laboratory research use only and are not presented for human or animal consumption, diagnosis, treatment, prevention, weight management, cosmetic use, or self-administration.