Chemical identity
| Component | CAS number | Molecular formula | Molecular weight | Sequence |
|---|---|---|---|---|
| GHK-Cu | 89030-95-5 | C14H23CuN6O4+ | 402.92 g/mol | GHK + Cu(II) |
| BPC-157 | 137525-51-0 | C62H98N16O22 | 1419.5 g/mol | GEPPPGKPADDAGLV |
| TB-500 | 885340-08-9 | C38H68N10O14 | 889.0 g/mol | Ac-LKKTETQ |
| KPV | 67727-97-3 | C16H30N4O4 | 342.43 g/mol | KPV (α-MSH 11–13) |
| Cartridge strength | 160 mg total peptide per cartridge |
|---|---|
| Concentration | 53.33 mg/ml total peptide |
| Presentation | Pre-mixed solution, sealed 3 ml cartridge |
| Storage | 2–8 °C, protect from light, do not freeze |
A blend has no single CAS number, formula or molecular weight — it is four distinct molecules in one solution, so each is listed separately. The 160 mg total is GHK-Cu 100 mg plus BPC-157, TB-500 and KPV at 20 mg each, which is 33.33 mg/ml GHK-Cu and 6.67 mg/ml of each of the other three — the same per-component concentrations as the corresponding single-compound pens.
Identifiers verified against PubChem in both directions — name to compound record, then each CAS number back again — and, where the sequence is of standard residues, cross-checked by recomputing the molecular weight from the sequence. No purity, HPLC or certificate-of-analysis figure is stated, because no supplier data supports one.
What KLOW is
KLOW is a trade name for a four-peptide combination, and the name is an acronym of its components' initials. It is the Glow set — GHK-Cu, BPC-157 and TB-500 — with the tripeptide KPV added.
As with Glow, there is no molecule called KLOW and the name carries no specification of its own. Blend names in this market are not standardised: another supplier's KLOW may hold a different ratio, or substitute a component, and there is no definition against which either would be wrong. The component list and the total mass are the specification.
Peptide Global's KLOW Peptide Pen 160 mg holds 160 mg of total peptide across the four components in a sealed 3 ml cartridge — 53.33 mg/ml of total peptide, the highest total-peptide concentration in the catalogue.
What KPV adds
KPV is a tripeptide: lysine, proline, valine. It is the carboxyl-terminal tripeptide of α-melanocyte-stimulating hormone — the same parent hormone that Melanotan II is derived from, though from the opposite end of the sequence and by a completely different route.
That shared parentage is a coincidence of provenance rather than of pharmacology. Melanotan II is a cyclised analogue built to activate melanocortin receptors; KPV is a short linear fragment studied predominantly for anti-inflammatory properties, and it is generally reported as not acting through the melanocortin receptors that mediate α-MSH's pigmentary effects. Two fragments of one hormone, doing unrelated things — which is the same lesson the ACTH fragment in Semax teaches: a fragment is a distinct molecule, not a portion of the parent's activity.
KPV is the smallest peptide anywhere in this catalogue at three residues, tying with GHK. In in-vitro work it appears mainly in inflammation models — cytokine production in stimulated cell cultures, and epithelial barrier models where inflammatory signalling is the readout. Peptide Global does not supply KPV on its own; it appears only as a component of this cartridge.
Four components, one solution
The 160 mg is GHK-Cu 100 mg plus BPC-157, TB-500 and KPV at 20 mg each, and that split is stated on the product page. In the 3 ml cartridge that is 33.33 mg/ml of GHK-Cu and 6.67 mg/ml of each of the other three — again the same per-component concentrations as the corresponding single-compound pens.
The product page's own dial figure confirms the arithmetic: six clicks delivers GHK-Cu 2 mg and 0.4 mg of each of the other three, which is exactly what a 0.01 ml increment gives at those concentrations. So a per-component concentration here is a published, checkable figure, not an unknown — and that is unusual in this market, where most blend listings state only a total.
What is fixed is the ratio. GHK-Cu is five parts to every one of the others, set at manufacture, so the four concentrations cannot be chosen independently of each other. And within a single experiment an observation still cannot be attributed to one component — four peptides were present, and two of the four, BPC-157 and KPV, have no consensus receptor to point at even in isolation. That is an argument for separate controls, not against the format.
None of that makes the format wrong. Combination effects are a legitimate object of study, and the whole point of a fixed-ratio cartridge is that the ratio is the same every time it is used, which makes results within a series comparable to each other even when they cannot be attributed to a component. It does mean the format answers a narrower question than a single compound does. When each is the right choice is set out in blends versus single compounds.
Handling
A blend inherits the strictest requirement of any component rather than an average, and here that is again set by GHK-Cu — a copper coordination complex, sensitive to pH and competing chelators, with a redox-active metal at its centre. Light protection and refrigeration apply to the whole cartridge.
Stated conditions are 2–8 °C, protected from light, not frozen, for as long as the cartridge is held and not merely in transit. Orders leave cold-packed in plain outer packaging, so the cartridge should go into refrigerated storage on arrival. See how to store research peptides and storage and handling.
Common questions
What does KLOW stand for?
It is an acronym of its components' initials. The blend is the Glow set — GHK-Cu, BPC-157 and TB-500 — with the tripeptide KPV added, giving four peptides in one cartridge.
What is KPV?
A tripeptide of lysine, proline and valine: the carboxyl-terminal tripeptide of α-melanocyte-stimulating hormone. It is studied predominantly for anti-inflammatory properties and is generally reported as not acting through the melanocortin receptors that mediate α-MSH's pigmentary effects.
What is the difference between KLOW and Glow?
KLOW adds KPV to Glow's three components and holds 160 mg of total peptide against Glow's 140 mg. Both are sealed 3 ml cartridges supplied pre-mixed.
How much of each peptide is in the KLOW pen?
GHK-Cu 100 mg, plus BPC-157, TB-500 and KPV at 20 mg each — 160 mg in total. That is 33.33 mg/ml of GHK-Cu and 6.67 mg/ml of each of the others in the 3 ml cartridge, and the product page's dial figure of six clicks to GHK-Cu 2 mg / 0.4 mg each confirms it. The ratio is fixed at manufacture; the split itself is published.
Can I buy KPV on its own?
Not from Peptide Global. KPV appears only as a component of the KLOW pen. GHK-Cu is the only one of the four components available here as a single-compound cartridge.
Is KLOW peptide legal in the UK?
None of the four components holds a UK marketing authorisation and no licensed UK medicine contains any of them. The blend is supplied for in-vitro laboratory research, which sits outside the medicines framework rather than being prohibited by it. BPC-157 and TB-500 additionally sit on the World Anti-Doping Agency's prohibited list. Purchasers remain responsible for their own compliance and their institution's rules; nothing here is legal advice.
Products described in this guide
Supplied for laboratory research use only. UK delivery is free on every order, tracked as standard.
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Research use only
Every compound named on this page is supplied by Peptide Global strictly for laboratory research use only. Nothing here is for human or veterinary use. These are not foods, supplements or cosmetics, and they are not intended to diagnose, treat, cure or prevent any disease. Nothing on this page is medical, veterinary or legal advice, and no part of it describes administration to a person or an animal.
Purchasers are responsible for their own compliance with applicable law and with the requirements of their institution or ethics committee. At checkout, purchasers confirm they are a qualified researcher aged 18 or over and that they accept the Research-Use-Only Policy and Terms & Conditions.
