GLOW peptide blend: the three components, how it is analysed, the 70 mg vial

GLOW is not offered for delivery in the EU at the moment. KLOW 80 mg holds the same three components at the same masses, plus 10 mg of KPV; the three blends are compared in KLOW vs GLOW vs Wolverine.

GLOW is a trade name for a fixed mixture of three synthetic peptides, weighed separately and freeze-dried together in one vial. The name says nothing about the contents; the label and the certificate do. The three components are:

Total: 70 mg in one sealed 3 mL glass vial. Each of the three is a peptide the catalog also sells on its own, with the same sequence and the same acetate salt form. Research use only. Not for human or veterinary use.

Search engines return the name next to cosmetic brands, marketplace listings and forum threads. None of that describes the object a laboratory receives. What follows does.

Seventy milligrams of freeze-dried peptide is a substantial cake, seven times the fill of a standard 10 mg vial. In the vial it forms a visible blue-violet layer, and the color is the first check.

Why blue-violet. Fifty of the seventy milligrams are GHK-Cu, the copper(II) complex of the tripeptide glycyl-histidyl-lysine.

Copper(II) in that coordination is blue-violet; the two other peptides are white. The cake therefore shows the GHK-Cu tint, slightly diluted. A white "GLOW" cake did not receive its copper tripeptide.

Why 50 / 10 / 10. The three masses are the same quantities the components are sold at on their own, or a multiple of them: 10 mg is the base vial of BPC-157 and of TB-500, and 50 mg is half the base 100 mg vial of GHK-Cu.

The proportions were set by what each single vial holds, which keeps the blend comparable with three separate purchases.

What "BPC-157" and "TB-500" mean here. BPC-157 is a defined 15-residue sequence (Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val) and there is no ambiguity about it.

"TB-500" is a trade name that covers more than one object on the market: the catalog's TB-500 is the acetylated heptapeptide Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln (residues 17 to 23 of thymosin β4, 889.0 g/mol), while some vendors sell full-length thymosin β4 (43 residues, about 4,963 Da) under the same name.

The mass on the certificate tells you which one went into the vial. The full data sheet is in TB-500 peptide: sequence, mass, CAS.

Further reading: AHK-Cu copper tripeptide and KPV peptide data sheet.

A single-peptide COA names one compound, gives its quantity in mg and its purity in %. A GLOW certificate does the same for three, and the reading takes a minute longer.

Three peaks on the chromatogram

On a reverse-phase HPLC run, BPC-157, GHK-Cu and TB-500 elute at three different retention times. Some laboratories print the trace that shows three main peaks.

The laboratory assigns each peak by running the reference standard of each peptide under the same gradient, then computes a purity figure for each component from the area of its own peak.

Look for three purity figures, one per component. A single averaged percentage for the whole vial is a shortcut that can hide a weak component behind two strong ones.

Three expected masses on the spectrum

The certificate should name the three components found, BPC-157, GHK-Cu and TB-500, with a quantity for each.

Some laboratories add a mass spectrum as an option; it would show ions at about 1,419.5 (BPC-157), 340.4 (GHK, the copper dissociating under ionization) and 889.0 (TB-500).

A fourth mass, 342.4, would mean KPV, which belongs to KLOW, not GLOW.

The fields that never change

• A named independent laboratory and a verifiable test number (Janoshik Analytical is the reference in this market; its reports can be looked up on the lab's site).
• The lot number, with the task number and verification key the laboratory confirms.
• The test date and a photograph of the tested vial wearing the supplier's own label.

The OXpeptides Janoshik reports (Retatrutide and GHK-Cu) are in the COA library; the GLOW product page sets out the composition, the vial sizes and the live price.

How each field is read, and what an edited certificate looks like, is in how to read a peptide COA.

Two questions come up on every GLOW listing: how it differs from KLOW, and whether the blend is the same thing as buying the three peptides separately.

GLOW vs KLOW. KLOW is GLOW plus 10 mg of the tripeptide KPV (Lys-Pro-Val), 80 mg in total. The two cakes look identical; only the label, the fourth peak and the fourth mass tell them apart.

The four-component blend has its own guide, KLOW peptide blend, and its own product page. GLOW is not available for delivery at the moment; KLOW ships from EU stock to the European Union.

GLOW vs separate vials. The peptides are the same.

What differs is the lot discipline: one vial means one lot and one storage line, against three lots and three storage lines.

A laboratory that wants to hold each compound on its own keeps the three separate; one that wants a fixed, pre-weighed mixture takes the blend.

The catalog also lists a two-peptide vial, BPC-157 + TB-500, for the pair without the copper tripeptide; the two are compared in BPC-157 and TB-500.

GLOW comes in one size, 70 mg, because the blend is defined by its three fixed masses. The catalog card at the top of this page reads the live price.

Compared with the smallest single vials of the three components (10 mg BPC-157, 100 mg GHK-Cu, 10 mg TB-500), the blend costs less than the sum, since one fill and one label replace three of each; it also holds half the GHK-Cu of that sum.

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 GLOW in the catalog →

The blend is stored to the standard of its most demanding component, the copper complex, which also asks to be kept from oxygen:

• Temperature: −20 °C for long-term storage, in the sealed vial.
• Light, moisture, oxygen: vial sealed, in its box. A cold vial reaches room temperature inside its bag, so condensation forms on the bag and not on the glass.
• Shelf life: 24 months sealed, stored as above; the printed date governs.

A few days of ambient shipping do not degrade a sealed lyophilized cake. The general rules are in lyophilized peptides: storage and shelf life.

Because the name is short and the search volume is large, "GLOW" appears on listings that have nothing to do with a lyophilized peptide vial. Four checks separate a reagent from a name:

1. The three masses are stated (10 / 50 / 10 mg). "GLOW 70 mg" alone is a name.
2. The COA shows three peaks, three masses and three purity figures, from a named laboratory, and can be verified on that laboratory's site.
3. The tested vial in the COA photo wears the supplier's label, and the report carries a task number and verification key the laboratory confirms.
4. The page describes the reagent only. Composition, purity documentation, storage, and "research use only" in plain sight. A page that describes anything else is a page that can disappear with an order in transit.

The complete method, one check at a time, is in how to check a peptide supplier.

Of the 70 mg in a GLOW vial, 50 mg are GHK-Cu: about 71 % of the peptide mass. The other two components, BPC-157 and TB-500, weigh 10 mg each. This ratio decides how the vial looks and how its certificate reads.

• The colour. GHK-Cu is a copper(II) complex, blue as a powder. Pure BPC-157 and TB-500 are white. Mixed and freeze-dried together at a 5 to 1 to 1 ratio, the cake comes out blue, lighter or darker depending on how it dried. A GLOW vial with a white cake does not contain 50 mg of copper complex.
• The masses. GHK-Cu is a small molecule (403.9 g/mol for the complex, 340.4 g/mol for the GHK tripeptide alone). By number of molecules, it outnumbers BPC-157 (about 1,419 g/mol) by more than 15 to 1 in the vial.
• The certificate. A purity figure for "the blend" as a whole would be dominated by the GHK-Cu peak. That is why a GLOW certificate has to list each component on its own line.

The same 50 mg of GHK-Cu is what gives KLOW its blue-violet colour; KLOW adds 10 mg of KPV, a white tripeptide, to the same three.

Reversed-phase HPLC sorts molecules by how strongly they stick to the column.

Small, very polar molecules come off first; longer, more hydrophobic chains stay longer. In a GLOW vial the three components are different enough to give three separate peaks:

1. GHK, a charged tripeptide, elutes early. The acidic mobile phase used by most methods can release the copper, which is why a report may name the GHK mass (340.4 g/mol) rather than the complex.
2. TB-500 (Ac-LKKTETQ, 889.0 g/mol), seven residues and two lysines, comes next.
3. BPC-157 (GEPPPGKP­ADDAGLV), fifteen residues with a hydrophobic Leu-Val end, is retained longest of the three.

The exact order depends on the column and the gradient, so a certificate identifies each peak by mass spectrometry rather than by position.

What matters for the buyer is simple: three peaks, three identities confirmed, a purity stated for each. A trace with one peak and a single percentage cannot describe three compounds.

The general method behind these figures is explained in what 99 % HPLC purity means. Research use only. Not for human or veterinary use.