GHK-Cu from GHK-Cu Labs is a copper(II) complex of the tripeptide Gly-His-Lys, supplied as a blue lyophilized powder in 50 mg and 100 mg vials. Every lot is independently tested, and its results are published as a lot record with the certificate PDF.
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Specifications and current testing status in one place.
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.
complete GHK-Cu specifications.
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. Lyophilized material absorbs moisture from the air, and absorbed moisture restarts the reactions that drying slows, so keep vials sealed until needed. Storage and stability guide.
| 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 |
Each vial size is listed with its current tested lot. Price: from $29.99 to $39.99 depending on size, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Current prices are always on klow.bio.
| 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 |
Ordering and shipping. GHK-Cu is sold through klow.bio, operated by Klow Labs LLC. Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout. See shipping and returns.
All testing is performed by Freedom Diagnostics, an independent laboratory, on every lot.
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.
Identity by LC-MS, with the laboratory’s reference numbers.
| 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 |
HPLC-UV purity for each current lot.
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.
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.
The copper(II) complex of the tripeptide glycyl-histidyl-lysine (GHK), also called copper tripeptide-1.
50 mg and 100 mg vials through Klow.bio. The current published lot is a 100 mg vial that measured 129.78 mg.
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.
Enter the lot number from your vial label at ghkcu.bio/verify/ to see that lot's results. To confirm with the laboratory directly: Scan the Freedom Diagnostics QR code printed on the certificate, then search for klow.bio under the Company tab to view the laboratory record.
The current price is from $29.99 to $39.99 depending on size, with bundle pricing (2 vials save 5%; 3 or more vials save 10%). Current pricing is always listed on Klow.bio.
Orders ship the next business day. Same-day cutoff is 4:00 PM CT, with overnight and 2-day options at checkout.
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.
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.