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GHK-Cu: Research Overview

What is GHK-Cu? GHK-Cu is the copper tripeptide glycyl-L-histidyl-L-lysine (Gly-His-Lys) complexed with a copper(II) ion. It occurs naturally in human plasma, with levels that decline with age. Researchers study it in dermal wound models, collagen and extracellular-matrix biology, and gene-expression profiling. It is sold strictly for laboratory research use.
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Read the evidence carefully

GHK-Cu is better supported than many sites suggest — a 2026 systematic review identified 20 studies including 2 randomized controlled trials, with signals in extracellular-matrix remodeling, collagen and angiogenesis. But most clinical evidence is topical / cosmetic; it should not be extrapolated to systemic use.

Systematic review: PubMed 42619529 (2026).

Technical profile

CompoundGHK-Cu (copper tripeptide-1; glycyl-L-histidyl-L-lysine copper complex)
ClassNaturally occurring tripeptide complexed with copper(II)
SequenceGly-His-Lys (glycyl-L-histidyl-L-lysine)
Molecular formulaC14H23CuN6O4+
Molecular weight402.92 g/mol
CAS number89030-95-5
PubChem CID71587328
Form suppliedLyophilized powder, sealed vial
StorageLyophilized: 2–8 °C, protected from light.
VerificationHPLC purity ≥99%, sterility, endotoxins, heavy metals — documented on the batch COA

Evidence at a glance

Research evidence is not one category. Human, animal (preclinical) and in-vitro / mechanistic data differ in strength — often sharply. VP Peptides separates them so no single line overstates the whole picture. Ratings are deliberately conservative and describe the published evidence base, not any effect in humans.

Human clinical
Limited
Animal / preclinical
Moderate
In-vitro / mechanistic
Strong
Regulatory statusNot FDA-approved as a drug (used topically in cosmetics); FDA has scheduled the Pharmacy Compounding Advisory Committee to consider GHK-Cu among additional peptides before the end of February 2027.
What remains unknown
  • Most evidence is cellular, gene-expression or topical/dermatologic — topical and in-vitro findings do not extrapolate to systemic human effects
  • Systemic or injectable use has essentially no human clinical evidence
  • Copper-loading and safety with repeated systemic exposure uncharacterized

What does the research literature cover?

GHK-Cu is one of the more extensively characterized copper peptides in the preclinical literature. Published cell-culture and animal-model studies have examined it in the context of:

A well-documented background fact drives much of the research interest: GHK-Cu occurs naturally in human plasma, and measured plasma levels decline substantially with age. This age-related decline is a descriptive observation from the literature, not a claim about supplementation or effects in humans.

Important context: the published evidence base is preclinical (cell and animal models). GHK-Cu supplied as a research chemical has no approved human use, and summaries here describe what researchers have studied — they are not claims about effects in humans.

Why purity matters for GHK-Cu research

Peptide research results are only as reliable as the material in the vial. Truncated sequences, inconsistent copper complexation, or endotoxin contamination confound experimental outcomes. Every VP Peptides GHK-Cu batch ships with a Certificate of Analysis documenting ≥99% HPLC purity plus sterility, endotoxin and heavy-metal testing from independent third-party testing.

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Frequently asked questions

Is GHK-Cu approved for human use?

No. GHK-Cu from VP Peptides is not approved by the FDA or any other regulatory agency for human use. It is supplied strictly as a research chemical for in-vitro and laboratory investigation. It is not a drug, supplement, food ingredient, or cosmetic ingredient.

What does a GHK-Cu Certificate of Analysis include?

Each batch COA documents HPLC purity (≥99% specification), sterility, endotoxin and heavy-metal screening results, along with batch number and test date.

How should GHK-Cu be stored in the lab?

Lyophilized vials should be kept at 2–8 °C and protected from light.

Why is the copper ion part of the compound name?

The tripeptide GHK has a high affinity for copper(II) and is typically studied — and naturally found in plasma — as the copper complex. The complexed form (~403.9 g/mol) is what most published dermal and matrix-biology studies characterize; the free peptide alone is ~340.4 g/mol.

Copper-peptide & extracellular-matrix biology, in context

Across the published copper-peptide literature, GHK-Cu is most often examined for how it interacts with the extracellular matrix — the scaffold of proteins and sugars that gives connective tissue its structure. In cultured fibroblasts, the tripeptide has been reported to modulate synthesis of collagen alongside selected glycosaminoglycans and the small proteoglycan decorin, while shifting the balance of matrix-remodeling enzymes and their inhibitors (Pickart et al., BioMed Res Int 2015).

A separate line of work uses genome-wide expression profiling to map how GHK exposure reshapes transcription in cultured cells, touching a broad share of the analyzed gene panel and clustering around tissue-repair, antioxidant and matrix-related pathways (Pickart & Margolina, Int J Mol Sci 2018). These are descriptive, mechanistic observations drawn from cell and animal systems — not demonstrations of an outcome in people.

The most recent synthesis is worth reading carefully. A 2026 systematic review catalogued roughly twenty studies, including two randomized controlled trials, and found the human signal concentrated in topical, dermatologic and cosmetic settings (systematic review, Aesthet Surg J 2026). That distinction matters: evidence gathered from creams applied to skin, or from cells in a dish, does not transfer to systemic use, and this page draws no such conclusion. GHK-Cu is not approved by the FDA as a drug, and the material described here is supplied solely for laboratory research. The practical value of these extracellular-matrix and gene-expression findings is that they frame testable hypotheses for further controlled study — they are not statements about safety, dosing or effect in humans.

Selected research references

Related research compounds

Research use only. All products described on this page are furnished for laboratory research purposes only and are not for human or veterinary use, not for use in food or cosmetics, and not for any diagnostic or therapeutic application. Nothing on this page is medical advice or a claim of safety or efficacy in humans. Research summaries reference publicly available preclinical literature; specific citations are listed in the references above.