KLOW vs GLOW vs Wolverine: the three peptide blends compared

The three names circulate on forums, marketplace listings and supplier catalogs as if they were three different products. They are better read as one family built by addition. Start from two peptides, add a third, add a fourth:

• Wolverine = BPC-157 + TB-500. Two components, usually 10 mg of each in one vial.
• GLOW = Wolverine + GHK-Cu. The copper tripeptide is added at 50 mg, so the vial reaches 70 mg.
• KLOW = GLOW + KPV. The tripeptide Lys-Pro-Val is added at 10 mg, so the vial reaches 80 mg. The K of the name is the K of KPV.

None of the three names is a molecule. Each is a composition: a list of synthetic peptides, each weighed separately, filled into one glass vial and freeze-dried together.

The comparison therefore comes down to four questions that have measurable answers: which peptides are in the vial, how many milligrams of each, what the cake looks like, and what an HPLC trace of the dissolved sample shows.

The names are not protected and nothing obliges a seller to respect the usual masses.

A listing that says "KLOW" without the four figures (10 / 50 / 10 / 10) gives a name, not a composition.

The figures in this comparison are the ones printed on the label of the vial in the OXpeptides catalog and the ones most suppliers use.

The four building blocks are all short synthetic peptides, made by solid-phase synthesis, purified by preparative HPLC and isolated as acetate salts. Their identity is a sequence and a mass, nothing more:

BPC-157 is a 15-residue peptide first described as a fragment of a gastric protein; it is the longest chain of the four.

TB-500 is the seven-residue acetylated segment LKKTETQ of thymosin β4, the actin-binding region of that protein.

GHK-Cu is the tripeptide glycyl-histidyl-lysine bound to a copper(II) ion, isolated in 1973. KPV is the C-terminal tripeptide of α-MSH.

The KLOW guide gives the masses in detail and the references of the reviews most cited for each component.

Two facts stand out in the table.

The proportions are not equal: GHK-Cu, the least costly of the four per milligram, is present at five times the mass of the others.

And BPC-157 and TB-500 sit at the same 10 mg in all three blends, so moving from Wolverine to GLOW to KLOW never changes those two; it only adds.

The step from Wolverine to GLOW is the largest in mass. GLOW keeps BPC-157 and TB-500 at 10 mg each and adds 50 mg of GHK-Cu, which more than triples the content of the vial (20 mg to 70 mg).

That addition changes what the vial looks like. GHK-Cu is a copper(II) complex, and copper(II) is blue-violet. A Wolverine cake is white, like most lyophilized peptides.

A GLOW cake is visibly blue-violet, a shade paler than a vial of pure GHK-Cu because the other two components are white.

The colour is the first check anyone can make without an instrument: a white cake sold as GLOW is missing its largest component.

It also changes storage.

Copper complexes ask to be kept away from oxygen as well as light and moisture, so a blend that contains GHK-Cu follows the GHK-Cu storage line rather than the simpler line of BPC-157 and TB-500. The rules are set out below.

Wolverine has its own guide, the Wolverine blend: what the vial holds, and so does GLOW: GLOW peptide blend.

The step from GLOW to KLOW is the smallest. KLOW holds exactly the GLOW composition, at identical masses, and adds 10 mg of KPV. The vial goes from 70 mg to 80 mg.

KPV is white, so on a bench the two vials look the same: the same blue-violet cake, the same 3 mL glass, a slightly larger layer of powder in the KLOW vial.

Only the label and an analysis tell them apart.

On a reverse-phase HPLC trace, KLOW shows a fourth main peak; on a mass spectrum, an ion near 342.4 sits right next to the GHK ion at 340.4, which a modern instrument resolves without difficulty.

KPV itself is described in KPV peptide: what it is, how it is supplied. In the OXpeptides EU catalog it is not sold as a single vial: KLOW is the way the catalog supplies KPV in Europe, alongside the three GLOW components.

Three checks, from the cheapest to the most precise:

1. The colour of the cake. White means no GHK-Cu: Wolverine, or a GLOW or KLOW missing its copper tripeptide. Blue-violet means GHK-Cu is there: GLOW or KLOW.
2. The amount of powder. 20 mg of lyophilized peptide is a thin layer; 70 or 80 mg fills a visible cake at the bottom of the vial. A "KLOW" vial that looks almost empty has not received its 80 mg.
3. The HPLC trace. Each peptide elutes at its own retention time, so the number of main peaks counts the components: 2 for Wolverine, 3 for GLOW, 4 for KLOW. A laboratory identifies each peak against its reference standard and reports a purity per component. A single purity figure printed for a whole blend averages two, three or four numbers into one.

Mass spectrometry, which some laboratories offer as an option, adds the expected masses: about 1,419.5 for BPC-157, 889.0 for TB-500, 340.4 for GHK (the copper dissociates under the usual ionization) and 342.4 for KPV.

A missing mass is a missing component. How to read a laboratory certificate field by field is explained in how to read a peptide COA.

A blend is one fill, one label and one sealed vial for several peptides. Bought separately, the same components cost more and arrive as several vials to store. In the OXpeptides EU catalog, prices read live from the catalog:

The separate route gives more GHK-Cu (the catalog sells it in 100 mg only) but no KPV, which the EU catalog does not sell alone.

For a laboratory that wants the four-peptide composition in Europe, KLOW is the only option in the catalog; for one that wants each compound in its own lot, the three single vials are there.

GLOW and Wolverine as such are not offered for delivery in the EU at the moment.

Every order ships from EU stock, tracked, in 4 to 6 business days, with no customs inside the Union, and a sealed vial can be returned within 30 days.

All three blends travel and store as sealed, lyophilized vials. The rule is to follow the most demanding component:

• Wolverine (BPC-157 + TB-500): −20 °C for long-term storage, sealed, away from light and moisture.
• GLOW and KLOW (with GHK-Cu): the same, and also kept away from oxygen, because of the copper complex. Keep the vial sealed in its box and let a cold vial reach room temperature before it leaves its bag, so no condensation forms on the glass.

A sealed lyophilized vial stored this way keeps for 24 months; the date on the label governs.

A few days of ambient shipping do not degrade the sealed powder, which is why research peptides travel without cold packs. The rules compound by compound are in lyophilized peptides: storage and shelf life.

The KLOW vial sold by OXpeptides is the four-peptide composition above, in its usual masses:

• Supplier specification: HPLC purity above 99 %.
• Composition on the label: BPC-157 10 mg, GHK-Cu 50 mg, TB-500 10 mg, KPV 10 mg, 80 mg in total, "research use only".
• Sealed, lyophilized vial: 3 mL borosilicate glass, bromobutyl septum, aluminium crimp cap.
• Shipped from the EU, tracked, in 4 to 6 business days, to the 27 EU countries.
• 30-day returns on a sealed vial.

The shop publishes its Janoshik Analytical reports for Retatrutide 10, 20 and 30 mg and for GHK-Cu 100 mg, each verifiable on the laboratory's site with its task number and key: they are in the COA library.

The KLOW product page sets out the composition, the vial size and the live price.

See KLOW 80 mg in the catalog →