Comparison · 2026-09-24
Scientific lead: Alice Kay, Ph.D.
GHK-Cu vs GLOW and KLOW: Research Comparison
Research-use notice: This page compares sequences, receptor classes, and catalog records. It is not medical or veterinary advice, and it does not rank materials for personal use. BlueNex Labs materials are research-use only. Research-use-only labeling is not a Health Canada authorization and it does not create a Drug Identification Number.
GHK-Cu is one copper-binding tripeptide. GLOW and KLOW are multi-peptide inventory fills that include that complex among other sequences. Indexing the blends from the copper-peptide class is a purchasing convenience. It is not a shared certificate, and it is not a shared molecular weight. This page compares the single complex with the two blend records. The class note is copper peptides. The sequence note is What is GHK-Cu?. The glossary lines are GHK-Cu and copper peptide.
The tripeptide complex
Pickart and Thaler, in Nature New Biology in 1973, isolated the tripeptide glycyl-L-histidyl-L-lysine from human plasma. Coordination of that tripeptide to copper(II) is what this catalog means by GHK-Cu. Three residues plus the metal are the identity. A bottle of a copper salt does not satisfy a method that names the complex, and a chromatogram of a longer peptide does not satisfy it either. The physiology-adjacent literature map is copper and GHK-Cu. Read it as a literature map. Matrix and gene-expression assays are the experimental frame used on this site. A result in one culture system stays in that system.
The single-complex listing is GHK-Cu 50 mg. The library row reviewed with mass, purity, and endotoxin links is certificates#ghk-cu-50mg. Endotoxin on that row does not extend to a blend. A tripeptide-copper complex can show a mass that includes the metal. Believe the report's stated form, not a guessed metal-free mass.
What each blend record actually names
GLOW 70 mg is a multi-peptide fill. The product record names three components: GHK-Cu, TB-500, and BPC-157. It states a 70 mg total fill. It does not print a per-peptide milligram split on that record. This page does not invent one. The lot report, when you open certificates#glow70, is the composition evidence for the lot named on that PDF. A GHK-Cu 50 mg certificate does not supply the missing split, because it is a different SKU.
KLOW 80 mg does print a split. The product record lists GHK-Cu 50 mg, BPC-157 10 mg, TB-500 10 mg, and KPV 10 mg. Those four numbers are catalog text for that SKU. They are not a specification for GLOW, and they are not a specification for the GHK-Cu 50 mg vial, even though one component mass matches the single-complex fill size. Matching a number is not matching a lot. KPV, Lys-Pro-Val, is the component that GLOW's record does not name. The KPV note is KPV. BPC-157's note is What is BPC-157?. TB-500 remains a thymosin beta-4 fragment, compared with BPC-157 on another page.
| Record | GHK-Cu | GLOW | KLOW |
|---|---|---|---|
| Sequence or length | Glycyl-histidyl-lysine, 3 residues, coordinated to copper(II) | Three named sequences in one fill: GHK-Cu, TB-500, and BPC-157 | Four named sequences: GHK-Cu, BPC-157, TB-500, and KPV |
| Molecular class | Single copper-tripeptide complex | Multi-peptide research fill | Multi-peptide research fill |
| Receptor or target class | Discussed in matrix and gene-expression models; not a GPCR ligand class | Mixed classes inside one vial; the certificate has to cover the fill, not one class | Mixed classes, including the KPV tripeptide that GLOW's record does not name |
| Catalog size | 50 mg | 70 mg total. No per-peptide split is printed on the product record. | 80 mg total: 50 mg / 10 mg / 10 mg / 10 mg as printed on the product record. |
| COA | certificates#ghk-cu-50mg | certificates#glow70 | certificates#klow-80mg |
Three library rows
On the September 20, 2026 review, all three SKUs have their own anchors. That is helpful, and it is also a trap if the anchors are swapped. The GHK-Cu row can include an endotoxin link for that complex. Copying the unit onto a blend, or dropping the denominator, makes a number that the blend file did not report. KLOW's row includes mass and endotoxin links of its own. GLOW's row is a separate Janoshik file. How to read a peptide COA applies to each file separately. A blend chromatogram may show more than one peptide-related peak. Do not assign every peak to GHK-Cu because that name is familiar.
Component single-peptide vials remain available for BPC-157 and TB-500, and for KPV. Ordering those vials is not the same purchase as ordering the blend, and their certificates do not document GLOW or KLOW. If the study file needs only the copper complex, the 50 mg SKU is the record that matches. If the study file needs the blend, name GLOW or KLOW and do not stop at GHK-Cu, because the other sequences are part of what arrived.
Category route and fulfilment
These cards sit on the cellular category hub beside thymosin fragments and melanocortin ligands. A copper tripeptide is none of those. Melanocortin sequences have their own mechanism page. Do not stretch a GHK-Cu certificate across that receptor class. Payment is Interac e-Transfer. Parcels move on Canada Post Xpresspost inside Canada. The operational page is Canada laboratory procurement. Research-use only. Not for human or veterinary use.
Frequently asked questions
- Does the GHK-Cu certificate document GLOW or KLOW?
- No. GHK-Cu 50 mg, GLOW 70 mg, and KLOW 80 mg are separate SKUs. Each has its own library row on the September 20, 2026 review. A component PDF does not document a blend lot, and a blend PDF does not document the single-complex vial.
- Do GLOW and KLOW print the same component list?
- No. The GLOW product record names GHK-Cu, TB-500, and BPC-157 in a 70 mg fill and does not print a per-peptide milligram split. The KLOW record names GHK-Cu 50 mg, BPC-157 10 mg, TB-500 10 mg, and KPV 10 mg.
- Is a copper salt the same material as GHK-Cu?
- No. GHK-Cu means the glycyl-histidyl-lysine tripeptide coordinated to copper(II). A copper salt is not that complex, and the blend vials are not that complex alone.
Research-use only. BlueNex Labs does not provide medical or veterinary advice. Confirm your institution’s policies before purchase.