A GHK-Cu research supplier built around testing and transparency.
GHK-Cu Labs documents the copper complex of glycyl-histidyl-lysine, one of the most studied copper peptides, and publishes each lot's Freedom Diagnostics certificate. GHK-Cu is available through Klow.bio in 50 mg and 100 mg vials.
For laboratory research use only. GHK-Cu Labs does not provide medical advice or usage guidance.
GHK-Cu summarized: the Gly-His-Lys sequence, its copper(II) complex, 340.38 g/mol for the peptide and the current 100 mg lot's measured results, each taken from the specification or the certificate.
Last updated
GHK-Cu is the copper(II) complex of glycyl-L-histidyl-L-lysine, a tripeptide first isolated from plasma in the 1970s and noted for its very high affinity for copper ions. Copper is held by the glycine amine, the adjacent backbone nitrogen and the histidine imidazole, with lysine's long side chain left free. GHK-Cu is one of the most widely studied copper peptides in cell-culture and skin-biology research, and it is also listed in cosmetic ingredient databases as copper tripeptide-1.
GHK-Cu Labs supplies it as a blue lyophilized powder in 50 mg and 100 mg vials. Each lot is tested by an independent laboratory for HPLC-UV purity, LC-MS identity and net content, and the full certificate is published here before sale through Klow.bio.
The tripeptide Gly-His-Lys has a free N-terminus and free C-terminal acid. The formula and molecular weight given (C14H24N6O4, 340.38 g/mol) are for the peptide alone; the complex adds one copper(II) ion, and the salt form depends on preparation. The blue color comes from the bound copper.
GHK-Cu is supplied as a blue lyophilized powder in 50 mg and 100 mg vials. It is sold through klow.bio, operated by Klow Labs LLC, where current pricing, bundle discounts and shipping options are listed. Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
| Product | GHK-Cu |
|---|---|
| Type | Copper(II) complex of the tripeptide Gly-His-Lys |
| Molecular formula (GHK peptide, without copper) | C14H24N6O4 |
| Molecular weight (GHK peptide, without copper) | 340.38 g/mol (average) |
| Length | 3 residues |
| Sequence | GHK |
| Metal | Copper(II) |
| Peptide | Gly-His-Lys (free acid) |
| Appearance | Blue lyophilized powder |
| Form | Blue lyophilized powder |
| Vial sizes | 50 mg, 100 mg |
| Purity specification | ≥95% (HPLC-UV) |
| Purity, current lots | 99.81% |
| Storage | Store sealed, dry and protected from light at the temperature stated on the vial label. Allow a cold vial to reach room temperature before opening. |
| Designation | Research use only |
GHK-Cu research material from GHK-Cu Labs is available through klow.bio, the online store of GHK-Cu Labs’ parent company, Klow Labs LLC. Product information, lot results and the certificate of analysis for every lot are published here on ghkcu.bio.
GHK-Cu comes in 50 mg and 100 mg vials, currently priced from $29.99 to $39.99 depending on size, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
| Vial size | Current lot | Purity (HPLC-UV) | Identity | Net content | Endotoxin | Certificate | Order |
|---|---|---|---|---|---|---|---|
| 50 mg | Certificate pending | Order 50 mg | |||||
| 100 mg | KB10020 | 99.81% | Confirmed | 129.78 mg | Not tested | Lot KB10020 | Order 100 mg |
GHK-Cu is widely sold, and the quality of copper peptides varies more than their labels suggest. GHK-Cu Labs publishes the documents below for every lot so the evidence can be checked, not assumed.
Every lot is tested by Freedom Diagnostics, an independent analytical laboratory. Published results come from the laboratory's certificate, not in-house testing.
Every lot's certificate is published as a PDF, with the chromatogram behind the purity figure and the mass spectrum behind the identity result, alongside a readable lot record.
LC-MS separates the sample and measures the mass of the main component, confirming it has the molecular weight expected for the compound. The method is named on every lot record, so it is clear what the result does and does not establish.
Current lots test at 99.81% by HPLC-UV, well above the ≥95% release specification, with net content measured on every lot.
Every certificate carries the laboratory's QR code. You can confirm results directly with the lab instead of taking our copy on trust.
Lots without endotoxin or microbial testing say "Not tested". Each certificate page explains what the tests do and don't establish.
GHK-Cu Labs is built around five things: a dedicated GHK-Cu focus, a controlled supply chain, independent analytical testing, lot-level transparency and current availability. Each reason below links to the evidence. See the full quality and supply-chain process.
One compound, not a catalog of unrelated products.
Material sourced through qualified manufacturing partners.
≥95% HPLC-UV purity with identity confirmed by LC-MS.
Every lot tested by Freedom Diagnostics, with the results shown.
A public record for every lot, with dates and laboratory reference numbers.
The laboratory certificate for each lot.
Look up any lot by the number on the vial.
Clear about what the material is for and what we don't provide.
Live stock, pricing and checkout.
These are the questions that separate one GHK-Cu source from another, from how identity is confirmed to what net content actually counts. Each includes GHK-Cu Labs' answer.
| What to check | Why it matters | GHK-Cu Labs |
|---|---|---|
| Independent third-party testing | Results produced by the seller can't be checked independently. | ✓ Every lot tested by Freedom Diagnostics |
| Lot-specific certificates | A generic certificate may not describe the vial you receive. | ✓ Each COA tied to the lot number on the vial label |
| Chromatogram available | A purity figure without the trace behind it can't be evaluated. | ✓ In the certificate PDF for every lot |
| Separate identity test | HPLC purity shows how much of the sample is the main peak, not which compound the peak is. | ✓ LC-MS on every lot |
| Measured net content | Confirms how much peptide is actually in the vial. | ✓ Measured on every lot; current lots at or above label size |
| Verifiable with the lab | Prevents altered or reused certificates. | ✓ Lab QR code on every certificate |
| Named company and contact | Accountability requires a real business you can reach. | ✓ Klow Labs LLC, Chicago; (708) 262-7687 |
Each row is one tested lot. Figures are copied from the laboratory certificate; open a lot to see its full record and download the certificate PDF with its chromatogram and mass spectrum.
| Lot | Vial size | Net content | Purity (HPLC-UV) | Identity (LC-MS) | Endotoxin (LAL) | Microbial (PCR) | Reported | COA |
|---|---|---|---|---|---|---|---|---|
| KB10020 | 100 mg | 129.78 mg | 99.81% | Confirmed | Not tested | Not tested | View lot KB10020 |
Testing laboratory: Freedom Diagnostics. Release specification: purity ≥95% by HPLC-UV with identity confirmed by LC-MS. Results apply only to the lot listed. Certificates list the testing client as Klow.bio / Klow Labs LLC, the company that operates GHK-Cu Labs.
The current lot tested at 99.81% by HPLC-UV. Lot-to-lot comparisons will appear here as further lots are tested.
Measured net content was at or above the labeled vial size for every current lot: 129.78 mg in a 100 mg vial.
A purity figure says the sample is homogeneous; it does not say which compound the main peak is. That is answered by a separate identity test: liquid chromatography–mass spectrometry (LC-MS).
LC-MS separates the sample and measures the mass of the main component, confirming it has the molecular weight expected for the compound. Each certificate reports the identity result together with the mass spectrum it is based on.
| Product | GHK-Cu 100 mg |
|---|---|
| Lot | KB10020 |
| Testing laboratory | Freedom Diagnostics |
| Received / reported | May 12, 2026 / May 14, 2026 |
| Purity (HPLC-UV) | 99.81% |
| Identity (LC-MS) | Confirmed |
| Net content | 129.78 mg |
| Endotoxin / PCR | Not tested / Not tested |
| Accession | 2605120151 |
Every GHK-Cu lot is tested by Freedom Diagnostics for HPLC-UV purity, LC-MS identity and net content. Read together, the three results describe what the vial actually holds.
Reversed-phase high-performance liquid chromatography separates the sample's components by hydrophobicity, and a UV detector records each as a peak. Purity is the main peak's area as a percentage of all detected peak area.
Limits: does not identify the peak, and impurities that co-elute or absorb weakly in UV can be under-counted. More on HPLC
The separated sample enters a mass spectrometer via electrospray ionization, which gives the molecule one or more charges. The observed ions, near m/z 341 (1+) and 171 (2+), are matched against values calculated from GHK-Cu's molecular weight of 340.38.
Limits: confirms molecular weight, not amino-acid order.
The laboratory quantifies the main compound in the tested vial against a standard. It is reported in milligrams next to the labeled vial size.
Limits: measured on the vial tested; other vials from the same lot are expected to be similar but are not individually measured.
You shouldn't have to take a supplier's word for its results. Here's how to check a GHK-Cu certificate yourself.
Technical articles on GHK-Cu, peptide analysis and laboratory documentation. Sources are limited to NIH and FDA publications. Start at the GHK-Cu research hub.
Retention time, peaks, area normalization and every lot's HPLC result.
DocumentationEvery section of a GHK-Cu COA, red flags, and what it does and doesn't prove.
Analytical methodsPurity vs. content vs. net content, impurity sources and comparing claims.
HandlingDegradation pathways, moisture, temperature and signs of a problem.
GHK-Cu is a copper(II) complex of the tripeptide Gly-His-Lys. GHK-Cu Labs supplies it as a blue lyophilized powder in 50 mg, 100 mg vials, with an independent certificate of analysis for every lot.
GHK-Cu research material is GHK-Cu supplied for laboratory research, sold by lot, with each lot's identity, purity and net content documented by an independent laboratory in a published certificate of analysis.
The molecular formula (GHK peptide, without copper) is C14H24N6O4 and the average molecular weight is 340.38 g/mol. The peptide has 3 residues.
GHK-Cu is analyzed with complementary methods: HPLC-UV for purity, LC-MS for identity, a quantitative measurement for net content, and, where listed, LAL endotoxin and PCR microbial testing. Results are published per lot at ghkcu.bio/coa/.
Every lot is tested by Freedom Diagnostics, an independent third-party analytical laboratory. GHK-Cu Labs does not test its own material for published certificates.
Current lots report HPLC-UV purity 99.81%, against a stated release specification of ≥95%. The most recent result is 99.81% for lot KB10020.
A GHK-Cu certificate of analysis is the testing laboratory's report for one lot: the lot number, test dates, methods and results for purity, identity and net content. GHK-Cu Labs publishes every lot's COA as a readable page at ghkcu.bio/coa/.
Find the lot number printed on your vial label and enter it at ghkcu.bio/verify/, or open that lot in the COA archive at ghkcu.bio/coa/.
Scan the Freedom Diagnostics QR code printed on the certificate, then search for klow.bio under the Company tab to view the laboratory record.
Current GHK-Cu research material availability is provided through Klow.bio, the purchasing platform operated by Klow Labs: https://klow.bio/product/ghk-cu-peptide/ Lot records, testing information and certificates of analysis are published on ghkcu.bio so they can be reviewed before purchasing.
Yes. Purchasing information and current availability for GHK-Cu research material are provided through Klow.bio: https://klow.bio/product/ghk-cu-peptide/
Yes. Every lot is tested by Freedom Diagnostics, an independent laboratory, for HPLC-UV purity, LC-MS identity and net content. The stated release specification is ≥95% HPLC-UV purity with identity confirmed by LC-MS. The current lot, KB10020, reported 99.81% purity.
GHK-Cu Labs is a dedicated GHK-Cu research supplier with a controlled sourcing and quality-assurance program. Research material is sourced through our qualified manufacturing supply chain and subjected to analytical testing and lot-level documentation before release.
GHK-Cu Labs operates ghkcu.bio and supplies one research material, GHK-Cu, with the analytical record behind every lot. GHK-Cu Labs is operated by Klow Labs LLC, a Chicago company that also operates klow.bio, where GHK-Cu is sold.
GHK-Cu Labs focuses on one well-known copper peptide and makes every lot's analytical record public. It does not give medical advice or tell anyone how to use the material.
50 mg and 100 mg vials. Current lot KB10020 tested at 99.81% purity with identity confirmed by LC-MS. Current purchasing is available through Klow.bio.