What is GHK-Cu? Matrix models and COA

Research-use notice: This article is laboratory and educational information only. It is not medical or legal advice, and it does not include how-to-use instructions. BlueNex Labs materials are research use only and are not intended for human or veterinary use. Research-use-only labelling is not a Health Canada authorization.

Publication status: Prepared for the BlueNex Labs Research Knowledge Centre. Literature and library notes checked September 24, 2026. Primary papers and the public COA library can change; verify the lot report in hand before an assay.

GHK-Cu is glycyl-L-histidyl-L-lysine coordinated to copper(II). The peptide portion is three residues. The complex is what laboratories mean when they specify the copper-binding tripeptide rather than a copper salt or the metal-free tripeptide. Pickart isolated the activity from human plasma in the early 1970s; later analytical work assigned the sequence. This page is the mechanism note. Vial size and Canada fulfilment sit on GHK-Cu 50 mg.

Copper occupancy is part of the identity

Copper is a cofactor for enzymes such as lysyl oxidase, which cross-links collagen and elastin, and superoxide dismutase, which handles superoxide in redox assays. Those facts explain why a copper-binding tripeptide is interesting in matrix models. They do not make GHK-Cu a dietary copper supplement, and they do not make every "copper peptide" trademark the same molecule. Sequence and metal occupancy belong on the Certificate of Analysis. The published GHK-Cu lot, including mass, purity, and endotoxin links, is in the GHK-Cu library section.

Uncomplexed GHK and GHK-Cu can be separated analytically. A purchasing note that says only "copper peptide" is incomplete. Record the complex, the milligram fill, and the lot number. The broader cofactor context is in copper and GHK-Cu in published physiology literature.

Plasma figures reported in a 2015 review

A 2015 review by Pickart and colleagues in BioMed Research International (PMID 26236730) reports plasma GHK at about 200 nanograms per millilitre near age 20 and about 80 nanograms per millilitre near age 60. Those are figures cited from earlier analytical work, reprinted in that review. A decline with age in a review is an observation about a circulating tripeptide. It is not a reason to describe a lyophilized vial as an age-related product, and this catalogue does not sell the solid that way.

The same review discusses fibroblast and matrix-component assays: collagen, elastin, and glycosaminoglycan readouts, and metalloproteinase activity measured in defined culture systems. Read those as model endpoints. The review title uses consumer-facing language about visible change. This note does not adopt that language. Cosmetic-ingredient rules and drug rules in Canada turn on intended use and advertising. BlueNex Labs intended use for the 50 mg SKU is laboratory work.

Gene-expression datasets, kept at their actual scope

Pickart and Margolina, writing in the International Journal of Molecular Sciences in 2018 (PMC6073405, PMID 29986520), connect the tripeptide to the Broad Institute Connectivity Map, a public library of transcriptional responses. At a cutoff of at least 50 percent change in expression, the authors report that GHK was associated with changes in 31.2 percent of the human genes they queried, with increases in some transcripts and decreases in others. That number is their analysis of a microarray resource. It is not a count of clinical outcomes, and it is not a specification printed on a vial.

A transcriptional correlation can suggest which pathways a laboratory might measure next: matrix genes, stress-response transcripts, or metalloproteinase-related messages. It cannot tell you that a 50 mg cake will produce the same fold-change in a different cell type, medium, or concentration. Put the concentration in the method section of the assay you are running. Do not take it from a supplier article.

What this note is not

It is not a finished-cream page and it is not a clinic protocol. Palmitoyl cosmetic sequences discussed elsewhere in the skin literature are different molecules. They are not implied SKUs. If a secondary article lists firmness or wrinkle scores from a topical study, those endpoints belong to that formulation. They are not Health Canada drug claims and they are not repeated here as product promises.

Blends that include the tripeptide are separate lots. GLOW 70 mg is described on its product page as a GHK-Cu, TB-500, and BPC-157 fill. KLOW 80 mg adds KPV to that set. A GHK-Cu certificate does not document either blend. Open the blend URL when the purchase is the blend, and open that blend's own library row when a report is published.

Analytical data before the assay

Identity for a tripeptide-copper complex is still an analytical question: observed mass, chromatographic purity, and any endotoxin result the lot actually reports. Task 212675, analysis conducted 13 August 2026, reports GHK-Cu 53.26 mg (GHK content 44.94 mg, copper 8.32 mg) and purity 99.659% for batch HF1F6C9. The endotoxin link on that library row is a separate published test and is not part of task 212675. How to read a peptide COA walks through HPLC versus mass spectrometry in more detail than this mechanism note should.

Legal framing stays on Are research peptides legal in Canada?. Research-use-only labelling is not an authorization. For receiving practice after the Canada Post scan, use peptide storage for Canadian laboratories.

Canada fulfilment, stated once

The 50 mg fill ships inside Canada only, after Interac e-Transfer checkout. The desk is in Burnaby. Xpresspost labels use a Port Moody PO Box. Sold-out status is inventory, not a wait-list. Category pages such as cellular and biological peptides group pathways. They do not merge certificates.

What a matrix notebook should record

If a laboratory uses GHK-Cu in a fibroblast or keratinocyte system, the method section needs the passage range, the medium, the serum conditions, the complex concentration, and the clock time of the readout. Matrix-component assays in the published reviews measure collagen, elastin, or glycosaminoglycan output, or they measure metalloproteinase activity and the inhibitors that sit next to those enzymes. Those numbers move when the medium changes. Copying a fold-change from a 2015 or 2018 review into a purchasing justification skips that dependency.

Record whether the well contained the copper complex, the metal-free tripeptide, or a copper salt control. The biochemistry that makes the complex interesting, lysyl oxidase and superoxide dismutase cofactor chemistry, is also the reason a salt control is not optional if the question is "does the tripeptide matter, or only the metal?" This page cannot answer that question for your cell line. It can only insist that the lot mass matches glycyl-L-histidyl-L-lysine plus copper before the well is plated.

Gene-expression follow-up belongs in the same notebook discipline. If you query a Connectivity Map-style signature, write down the cutoff you used and the cell background of the reference dataset. The 31.2 percent figure above is the authors' cutoff, not a universal constant. A later microarray or RNA-seq experiment on a different line is a new dataset.

Frequently asked questions

What is GHK-Cu in laboratory terms?

GHK-Cu is the tripeptide glycyl-L-histidyl-L-lysine coordinated to copper(II). Laboratories use the complex as a defined ligand in matrix and gene-expression assays. It is not a synonym for dietary copper and it is not a finished cosmetic.

Does the GHK-Cu Certificate of Analysis cover GLOW or KLOW?

No. The GHK-Cu 50 mg library entry, including its mass, purity, and endotoxin links, documents that lot only. GLOW 70 mg and KLOW 80 mg are separate SKUs. Open each blend's own certificate when one is published.

What does research use only mean for this copper tripeptide?

It means the vial is supplied for laboratory work. Research-use-only wording does not authorize human or veterinary use and does not replace a Health Canada drug authorization.

Where are GHK-Cu orders fulfilled?

Inside Canada only, after Interac e-Transfer checkout. Canada Post Xpresspost labels use a Port Moody PO Box, and the desk is in Burnaby. Sold-out vials stay listed and cannot be added to the cart.

Catalogue cross-reference

For the buy-intent URL for the 50 mg complex, see GHK-Cu 50 mg. Use that certificate anchor for the single-peptide lot. Do not reuse it on GLOW or KLOW.

Orders ship inside Canada only after Interac e-Transfer checkout. Sold-out SKUs remain listed and cannot be added to the cart. Match each vial to its own Certificate of Analysis when a lot is published. Research use only. Not for human or veterinary use.