KLOW peptide blend: what is inside, how it is analysed, sizes

KLOW is a trade name for the three-peptide GLOW blend with a K in front, for the tripeptide KPV that was added to it.

Behind the name, the object is simple. Four synthetic peptides, weighed separately, filled into one vial and freeze-dried together.

Each of the four components has its own sequence and mass:

Total: 80 mg of peptide in a single sealed glass vial. KLOW is the four-component version of GLOW, which holds the first three only (70 mg). Research use only. Not for human or veterinary use.

Open the box and you find one 3 mL borosilicate vial with a bromobutyl septum and an aluminum crimp cap. At the bottom sits a lyophilized cake. Two things about that cake tell you what it is before any instrument does.

The color. GHK-Cu is a copper(II) complex, and copper(II) is blue-violet.

Fifty of the eighty milligrams are GHK-Cu, so a KLOW cake is visibly blue-violet, the same tint as a plain GHK-Cu vial, slightly paler because the other three peptides are white.

A white "KLOW" cake means the copper tripeptide was left out, or never weighed in.

The volume. Eighty milligrams of freeze-dried peptide is far more material than the 10 mg most single-peptide vials carry.

The cake fills a visible layer at the bottom of the vial rather than a film. A KLOW vial that looks empty has not received its 80 mg.

The proportions are not equal. GHK-Cu, a three-residue peptide in industrial production for decades, is the least costly of the four per milligram, and the blend carries five times more of it.

BPC-157 (15 residues) and TB-500 (a seven-residue acetylated fragment of thymosin β4) are costlier per milligram and are present at 10 mg each, the same quantity as their single vials. KPV, a tripeptide like GHK, is at 10 mg.

Every component is a synthetic peptide, made by solid-phase synthesis, purified by preparative HPLC and isolated as an acetate salt. The label on the vial states the four names, the total quantity (80 mg) and "research use only".

Further reading: GHK-Cu copper peptide, AHK-Cu copper tripeptide and GHK-Cu vs AHK-Cu.

A blend raises a question a single-peptide vial does not: how does a laboratory confirm that four peptides are present, in the stated proportions?

Reverse-phase HPLC answers it peak by peak, and mass spectrometry can confirm each identity.

HPLC: one main peak per component

On a reverse-phase HPLC run, each peptide elutes at its own retention time. The chromatogram of a four-peptide blend therefore shows four main peaks, not one.

The laboratory identifies each peak by running the four reference standards under the same gradient, then reports a purity figure per component, calculated from the area of that component's peak against its own impurities.

A single figure printed for the whole vial averages four numbers into one.

Mass spectrometry: four expected masses

The mass spectrum of the dissolved sample may show ions at each expected mass: about 1,419.5 for BPC-157, 340.4 for GHK (the copper dissociates under the usual ionization), 889.0 for TB-500 and 342.4 for KPV.

Some laboratories offer this optional confirmation. Because GHK and KPV are close in mass (340.4 and 342.4), the spectrum has to resolve the two, which a modern instrument does without difficulty.

What the KLOW vial in the catalog carries

• 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.
• Sealed, lyophilized vial with crimp cap, research use only.
• Shipped from the EU, tracked, in 4 to 6 business days.
• 30-day returns on a sealed vial.

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

The KLOW product page sets out the composition, the vial size and the live price. How to read a certificate of analysis field by field is explained in how to read a peptide COA.

Further reading: Bacteriostatic water for research.

The two blends share three components at identical masses. KLOW adds 10 mg of KPV.

On a bench the two vials look alike: the same blue-violet cake, the same 3 mL glass.

The label tells them apart, and the HPLC trace: three main peaks for GLOW, four for KLOW. The three-component blend has its own guide: GLOW peptide blend.

The tripeptide that makes the difference is described in KPV peptide: what it is, how it is supplied.

Three trade names circulate for lyophilized mixtures built from the same short list of peptides. They are told apart by their component masses and by nothing else, so the table is the comparison.

Read the colour first.

Any vial holding the copper tripeptide is blue-violet, so a white cake sold as GLOW or KLOW is missing 50 of its milligrams before any instrument is switched on.

Read the peak count second: a certificate printing one purity figure for a mixture has averaged two, three or four numbers into one.

The two-component vial has its own guide, the Wolverine blend, and the three-component one is GLOW. The full comparison, with price per milligram and which blend ships from the EU, is in KLOW vs GLOW vs Wolverine.

KLOW comes in one size, 80 mg. There is no 40 mg or 160 mg vial, because the blend is defined by its four fixed masses; a different total would be a different product.

Three of the components are also sold on their own in the EU catalog (BPC-157 and TB-500 in 10, 20 and 30 mg; GHK-Cu in 100 mg), for a laboratory that prefers to hold each compound in its own lot.

The catalog card at the top of this page reads the live price from the catalog.

Bought separately at their smallest sizes, BPC-157, TB-500 and GHK-Cu already cost more together than the blend, and KPV is not sold alone in the EU catalog.

The blend brings the four components in one fill, under one label, in one sealed vial.

What the price includes at OXpeptides: a sealed, labeled vial and the lyophilized compound inside, named with its net quantity in mg on the label. Ships from the EU · tracked: €9.90, free from €120.

See KLOW in the catalog →

A blend is stored like its most demanding component. Of the four, GHK-Cu is the one that also asks to be kept away from oxygen (the copper complex), so the KLOW storage line follows the GHK-Cu line:

• Temperature: −20 °C for long-term storage, in the sealed vial, away from light and moisture.
• Light, moisture, oxygen: keep the vial sealed and in its box. Let a cold vial reach room temperature before it leaves its bag so no condensation forms on the glass.
• Shelf life: 24 months for a sealed lyophilized vial stored as above; the date on the label governs.

Ambient shipping over a few days does 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.

"KLOW peptide" returns clinics, guides written by resellers, marketplace listings and a few research suppliers. The listing you want answers five questions on the page itself.

1. Are the four masses stated? "KLOW 80 mg" without the breakdown (10 / 50 / 10 / 10) is a name, not a composition.
2. Is the purity stated (HPLC, in %), and does the powder come lyophilized in a sealed vial?
3. Does the shop publish independent laboratory reports you can check on the laboratory's own site? OXpeptides publishes its Janoshik reports for Retatrutide and GHK-Cu in the COA library.
4. Does the vial ship from domestic stock, tracked, in a few days? For KLOW, the catalog ships from our EU stock, tracked, to the European Union.
5. Does the page describe the reagent only (composition, purity documentation, storage), with "research use only" stated plainly? A supplier that publishes usage content is a supplier that is easy to shut down, and that risk lands on the buyer whose parcel is in transit.

The seven-point method, with what a re-used or edited certificate looks like, is in how to check a peptide supplier. The Europe-wide checklist (payment, packaging, a stopped parcel) is in where to buy research peptides in Europe.

Further reading: bacteriostatic water.