What is the Glow Stack? Composition, ratio and certificate
The short answer. Glow is a three peptide blend supplied as a single lyophilised vial, containing GHK-Cu, BPC-157 and TB-500. In the June 2026 batch an independent laboratory measured the contents at GHK-Cu 58.44 mg, TB-500 12.65 mg and BPC-157 12.46 mg, for a total peptide content of 83.55 mg. Those are measured figures from an assay rather than label claims, and the report can be checked on the laboratory's own website.
For research purposes only. Not for human consumption. 18+. UK only. This article describes the composition and laboratory testing of research materials. It does not describe effects, uses, dosing or administration, and nothing here is a claim about what any compound does.
What Glow is
Glow is a supply format, not a scientific category. Three peptides are lyophilised together into one vial rather than supplied as three separate vials. The compounds are unchanged by being blended together.
The name is an initialism of its contents. It is also the base that a second, more widely searched blend is built from: add KPV to Glow and the result is Klow. Anyone comparing the two is really comparing the presence or absence of one peptide.
The blend format changes practical things. One vial instead of three, one reconstitution instead of three, and a single certificate covering the combination. It also changes what a laboratory is able to report about the vial, which is set out below.
Measured composition, June 2026 batch
Figures returned by Janoshik Analytical for the batch assayed on 23 June 2026. The report number links to the laboratory's own verification page.
| Peptide | Measured content | Share of vial |
|---|---|---|
| GHK-Cu | 58.44 mg | 69.9% |
| TB-500 | 12.65 mg | 15.1% |
| BPC-157 | 12.46 mg | 14.9% |
| Total peptide content | 83.55 mg | 100% |
Report: #168677, Janoshik Analytical, 23 June 2026.
GHK-Cu is close to 70% of the vial by mass. This is the most useful fact about Glow's composition and it is rarely stated. BPC-157 and TB-500 sit close together at roughly 12.5 mg each. A headline figure such as "80 mg" is not three equal portions.
This follows from the compounds rather than from any supplier's choice. GHK-Cu is conventionally supplied in much larger quantities than BPC-157 or TB-500, so any blend containing it is dominated by it.
Glow compared with Klow
Both assayed from the same June 2026 batch run.
| Glow | Klow | |
|---|---|---|
| Peptides in the vial | 3 | 4 |
| GHK-Cu | 58.44 mg | 54.66 mg |
| TB-500 | 12.65 mg | 11.80 mg |
| BPC-157 | 12.46 mg | 11.18 mg |
| KPV | not included | 10.95 mg |
| Total | 83.55 mg | 88.59 mg |
| Report | #168677 | #168699 |
The three shared peptides are measured slightly higher in Glow than in Klow. The Wolverine Stack is the simpler two peptide blend of BPC-157 and TB-500, measured at 25.12 mg total in the same run. All three are compared in what is in a peptide stack.
What the three peptides are
Brief factual descriptions, each linking to a fuller reference page. None are statements about effects.
GHK-Cu is a copper binding tripeptide, glycyl histidyl lysine, complexed with copper. It is supplied here in by far the largest quantity. Reference page: GHK-Cu.
TB-500 is a synthetic fragment of Thymosin Beta-4, a naturally occurring 43 amino acid protein first described in the 1980s. Reference page: TB-500.
BPC-157 is a 15 amino acid peptide, sequence GEPPPGKPADDAGLV, described in the literature as a partial sequence derived from a protein found in gastric juice. Reference page: BPC-157.
BPC-157 and TB-500 are the two most frequently confused with one another. A neutral comparison is at BPC-157 vs TB-500.
Why a blend has no single purity percentage
This is worth understanding before comparing suppliers.
A single peptide vial can be tested two ways at once. Mass spectrometry confirms identity, that the vial contains the compound named on the label. High performance liquid chromatography reports purity, the proportion of the sample that is the target compound rather than impurities. That is where a figure such as 99% comes from.
A vial containing three intended peptides has no single target compound. Chromatography separates three things that are all meant to be present, so there is no basis for expressing the rest as a proportion of one of them.
A blend assay instead confirms identity for each peptide and measures content by mass for each. That is what the table above is.
So for Glow:
- You can verify which three peptides are in the vial.
- You can verify how much of each, in milligrams.
- You cannot obtain a single HPLC purity percentage, and any supplier quoting one for a multi peptide vial is quoting a figure that does not exist.
That is a quick test to apply to any supplier selling blends.
How to check this yourself
None of the figures need to be taken on trust, which is why the report numbers are published.
Each links to Janoshik's own verification page. The number is entered there and the laboratory returns the result directly. Where a supplier publishes a certificate as an image with no verifiable report number, there is nothing to check.
A walkthrough of the fields on a report is at how to read a Certificate of Analysis, and the verification process is at verify a certificate. Every report is listed at published lab reports.
Common questions
What does Glow stand for? It is an initialism of its three components: GHK-Cu, BPC-157 and TB-500.
What is the difference between Glow and Klow? Klow is Glow with a fourth peptide, KPV, added, measured at 10.95 mg in the June 2026 batch. Measured totals were 83.55 mg for Glow and 88.59 mg for Klow.
What is the ratio of peptides in the Glow Stack? In the June 2026 batch, roughly 70% GHK-Cu, 15% TB-500 and 15% BPC-157 by mass.
Does the Glow Stack have a Certificate of Analysis? Yes. The June 2026 batch is Janoshik report #168677, verifiable on the laboratory's own site.
Why is there no purity percentage for Glow? Purity by HPLC is the proportion of a sample that is one target compound. A vial with three intended peptides has no single target, so the figure has no meaning for a blend.
Is a blend the same as buying the peptides separately? As supplied it is one vial containing three lyophilised peptides rather than three vials. The compounds are the same compounds.
What is used to reconstitute it? The same as any lyophilised research material. Bacteriostatic water is used where a vial will be drawn from more than once. Reference page: bacteriostatic water.
Where to look next
About the author
Sebastian Reuters is a science and health writer working with BioHack London on research-orientation content. He covers analytical methodology, regulatory landscape, and supplier-evaluation topics for the UK research community.