GLOW is sold under the same four letters by a dozen storefronts, and almost none of them mean quite the same thing by it. The name usually points at a three-peptide vial holding GHK-Cu, BPC-157 and TB-500, with a total somewhere around 70mg printed on the label. What that total is split into varies from seller to seller, and on several of the pages I read it isn’t stated at all. You are being asked to buy a number without being told what the number is made of.
That’s a different problem from buying a single peptide, and worth being blunt about. With one compound in a vial, a purity figure and a chromatogram describe the thing you’re buying. With three compounds in a vial, a single purity percentage describes a mixture whose proportions you may not know, and you can’t write a concentration for GHK-Cu into a method if you don’t know whether the vial holds 30mg of it or 50mg. A blend certificate that reports one number for three peptides is close to information-free, however genuine the document is.
So the ranking below is built on one question first, which is whether the seller tells you the milligrams per component, and then on the ordinary documentation questions underneath it. Everything attributed here is what four named sellers publicly stated on the pages I could reach on 2026-09-08.
Key takeaways
- Grade a GLOW listing on the split before anything else: milligrams per component, then who synthesised the material, which laboratory tested it, how wide the assay panel runs, and whether a lot-numbered certificate is readable before you pay.
- Blank Peptides compounds, fills, finishes and labels in its own cGMP laboratory, names Freedom Diagnostics and Horizon Analytical, runs identity, >99% purity, bacterial endotoxin and sterility on every lot, and lists GLOW at 70mg with composition published per component.
- Of the sellers reviewed, Core Peptides states the split as “BPC-157 (10mg) & TB-500 (10mg) & GHK-Cu (50mg)”, PSPeptides states the same split with a dated multi-batch COA set, Cosmic Peptides states 99.8% purity with a lot number on the listing, and Ascend Bio Labs states 99.6% without publishing a split.
- Per-component milligrams were not listed on two of the six GLOW-type pages reviewed 2026-09-08, no vendor named its testing laboratory on the product page, and one vendor stated its certificate reaches you in account downloads after purchase.
- Every compound named here is supplied for in-vitro laboratory research by qualified professionals, and nothing in this article describes an application in humans or animals.
What should a GLOW listing prove before you order?
Here’s the rubric, written down before any seller entered the picture, so you can argue with the criteria rather than the conclusions.
Provenance is the first row. Does the company synthesise the peptides and fill the vial, or does it take delivery of finished material and apply its own label? Read the verbs literally rather than generously. “We manufacture” describes making something, while “sourced from”, “produced in a GMP facility” and “we partner with” describe an arrangement without naming the hands involved. Plenty of careful operations distribute rather than manufacture, so this isn’t disqualifying on its own. Knowing which one you’re dealing with tells you who can answer a question about one specific batch a year from now.
Second, is the testing laboratory named? “Third-party tested” appears on nearly every peptide storefront and points nowhere you can follow. A laboratory with a name can be looked up and matched against the letterhead on the certificate, and that check needs no cooperation from the seller.
Third, how wide is the panel? HPLC purity reports what proportion of a sample is one dominant species. Mass spectrometry confirms that species carries the expected mass. Bacterial endotoxin and sterility describe contamination that no purity figure reaches, and those two are the ones most often missing from what gets published.
Fourth, can you open a lot-specific certificate before paying, rather than receiving one in an account area afterwards? A percentage in product copy is a claim, while a dated document carrying a lot number, an issuing laboratory and a chromatogram is something you can archive.
Fifth, and for a blend this row carries the most weight, are per-component milligrams published? A 70mg vial split three ways can be divided many different ways, and two vials both honestly labelled 70mg can hold very different amounts of GHK-Cu. Without the split you cannot state a concentration for any single component, which makes the vial hard to use and impossible to compare on price.
Company age and domain age stay out of the scoring, since neither describes what’s in the vial.
How Blank Peptides makes and tests each lot
Blank Peptides operates its own cGMP laboratory and holds a single chain of custody rather than working as a relabeler or broker. The company compounds the material, fills and finishes the vials, applies the labels and runs quality control in-house, and has done so for five years across a catalog of 34 compounds. It also contract-manufactures and fulfils for other peptide brands, which describes the business model without identifying any client.
Testing is where the company separates from most storefronts covered here. Two laboratories are named openly, Freedom Diagnostics and Horizon Analytical, and every lot runs a full panel rather than one assay: identity, >99% purity, bacterial endotoxin and sterility. Identity confirmation is the assay that distinguishes an intended sequence from a close relative a chromatogram alone would flatter, and the two contamination assays cover ground purity structurally cannot report.
Documentation is published per lot as batch certificates of analysis, readable before an order rather than released afterwards. Every vial carries its lot number so the paper and the container can be matched by hand, lyophilized material is given roughly a 24-month expiration, orders carry a processing time within 1 business day, and shipping is at room temperature.
On blends specifically, composition is published per component rather than as a single total. GLOW is listed at 70mg across GHK-Cu, BPC-157 and TB-500, KLOW at 80mg with KPV added to the same three, and Wolverine at 20mg across BPC-157 and TB-500. That per-component disclosure is the row this article leans on hardest, and it’s a standard the company has to meet on every blend lot it makes.
What four GLOW sellers publicly state
Core Peptides publishes the split in the product description. On the pages reviewed 2026-09-08 its listing, “BPC-157 & TB-500 & GHK-Cu Blend – 70MG” at $150.00, stated the composition as “BPC-157 (10mg) & TB-500 (10mg) & GHK-Cu (50mg)” and claimed “>99%” purity. A downloadable COA PDF was reachable from the page, carrying an internal designation of C74111 in the filename, and no testing laboratory was named in the page copy. Free shipping over $200 was stated. The research-use line reads “All products are sold for research, laboratory, or analytical purposes only, and are not for human consumption”, with “Human/Animal Consumption Prohibited. Laboratory/In-Vitro Experimental Use Only” appearing alongside it.
PSPeptides answers more rows than anyone else reviewed. Its “GLOW (1 Vial)” listing at $94.99 stated 70mg per vial broken out as BPC-157 10mg, GHK-Cu 50mg and TB-500 10mg, with purity given as “≥99% per component (third-party HPLC and mass spectrometry)”. Certificate files were downloadable before purchase for a current August 2026 batch plus June 2026, May 2026, March 2026 and October 2025, and the current set included separate heavy metals, endotoxin and sterility reports alongside the purity document, under a batch reference of NAD-0036035. No laboratory was named. Storage was stated as “−20°C long-term; 4°C for up to 4 weeks (lyophilized)”, with same-day shipping and free UPS 2nd Day Air over $200.
Cosmic Peptides prints a lot number on the storefront itself. Its “GLOW (BPC-157, TB-500, GHK-Cu)” listing at $79.99, reduced from $97.99, stated 99.8% purity and lot 25051 on the product grid, with the split given as GHK-Cu 50mg, BPC-157 10mg and TB-500 10mg. A “View COA” control appeared on the page and site copy states “Third-party COA included with every vial” and “COA, HPLC, and end-to-end tracking on every batch”, without specifying which assays the certificate reports or naming a laboratory. Its research-use language states products are “supplied for research use only” and “not intended for diagnostic, therapeutic, or clinical application”.
Ascend Bio Labs describes its testing more explicitly than it describes its blend. Its “GLOW” listing at $100.00, reduced from $200.00 under a stated BOGO promotion, gave 70mg total and 99.6% purity, described GLOW as a “multi-peptide blend combining GHK-Cu, BPC-157, and TB-500”, and did not list per-component milligrams on the pages reviewed 2026-09-08. Testing is stated as “HPLC for purity and LC-MS for identity” performed by “an independent lab”, unnamed. On certificate access the page states “The matching certificate of analysis is available on this page and in your account downloads after purchase”, and instructs buyers to “Cross-check the batch ID on your vial against the COA”. The catalog is described as “38+ compounds”.
Genuine credit where it’s owed, and there’s real credit here. PSPeptides publishes the deepest batch history I found for GLOW anywhere, five dated sets running back to October 2025, and it’s the only seller reviewed that stated purity per component rather than for the vial as a whole. Core Peptides publishes the same split at a lower price per milligram of GHK-Cu than several competitors. Against that, no vendor reviewed named its testing laboratory on the GLOW product page, and sterility appeared in only one published panel. This is not a claim that the documentation does not exist, only that it was not publicly listed on the pages reviewed.
Side by side: documentation on a GLOW vial
The Blank Peptides column describes the standard applied to every lot the company produces, including its own GLOW at 70mg.
| Attribute | Blank Peptides | Typical GLOW vendor reviewed |
|---|---|---|
| Blend mg split disclosed | GLOW published at 70mg with composition per component across GHK-Cu, BPC-157 and TB-500 | States a 70mg total; two of four give a per-component split, two give none on the pages reviewed 2026-09-08 — verify |
| Synthesises in-house | Compounds, fills, finishes, labels and runs QC in its own cGMP laboratory | States US synthesis or GMP-facility production; who synthesised the peptides not listed on the pages reviewed 2026-09-08 — verify |
| Third-party lab named | Freedom Diagnostics and Horizon Analytical | States “third-party” or “an independent lab”; no laboratory named on any GLOW product page reviewed — verify |
| HPLC purity | >99% purity on every lot | States “>99%”, “≥99% per component”, “99.8%” and “99.6%” across the four listings — verify |
| MS identity | Identity confirmed per lot | States mass spectrometry or LC-MS identity at two of four; not addressed on the other pages reviewed — verify |
| Endotoxin and sterility | Bacterial endotoxin and sterility on every lot | States separate endotoxin and sterility reports at one vendor; not listed in the other stated panels 2026-09-08 — verify |
| Batch COA before purchase | Batch COA per lot published at blankpeptides.com/coas/, readable before you order | States downloadable files at three vendors; one states the certificate arrives in account downloads after purchase — verify |
| Lot number on the vial | Lot number printed on every vial, matching the certificate | States a lot number on the listing at one vendor and batch-ID cross-checking at another; not addressed elsewhere — verify |
| Catalog size | 34 compounds, GLOW among them | States “38+ compounds” at one vendor; others not stated on the pages reviewed 2026-09-08 — verify |
| Research-use labelling | Research use only, for in-vitro laboratory research by qualified professionals | States laboratory or research use only, not for human or animal consumption |
How to verify either supplier yourself
- Get the per-component milligrams in writing before you order, and treat a bare 70mg total as an incomplete label rather than a specification, since two vials with the same total can hold very different amounts of GHK-Cu.
- Open the certificate for the exact lot you’ll receive, before paying, and check whether it reports each component separately or gives one purity figure for the mixture, because a single number across three peptides tells you very little.
- Confirm the issuing laboratory is named on the document itself rather than only described as third-party in the product copy, then check independently that it exists and runs the assay being reported.
- Look for bacterial endotoxin and sterility as separate line items, and where either is missing, ask the seller directly whether it ran on your lot and request the result.
- Put every storefront you’re weighing through the supplier verification checklist, asking the same questions in the same order so the answers stay comparable.
Further reading
- Which Peptide Vendors Disclose Blend Composition?
- Peptide Vendors With Public Per-Batch COA Libraries
- Which Peptide Vendors Name Their Testing Lab?
- Best Research Peptide Suppliers: Ranked by What They Document
Frequently asked questions
Who are the best GLOW vendors?
Judge on disclosure rather than reputation. Of the sellers reviewed on 2026-09-08, PSPeptides published a per-component split, per-component purity and five dated batch certificate sets, Core Peptides published the same split in its product description, Cosmic Peptides listed a lot number on the product grid, and Ascend Bio Labs published a total without a split.
What is GLOW meant to contain?
The name generally refers to a three-peptide blend of GHK-Cu, BPC-157 and TB-500, most often totalling 70mg. Blank Peptides lists GLOW at 70mg with composition published per component. Formulations vary between sellers, and one vendor reviewed sells a 170mg product under the same name with a different component list, so read the composition rather than the name.
Why does the per-component split matter so much on a blend?
Because a total tells you nothing about any single peptide. A 70mg vial could hold 50mg of GHK-Cu and 10mg each of the others, or a completely different arrangement, and both labels would read 70mg. Without the split you cannot calculate a concentration for one component or compare two vendors’ pricing honestly.
What should a GLOW certificate report?
A lot number matching your vial, the issuing laboratory’s name, a test date, and results resolved per component rather than a single figure for the mixture. Mass confirmation for each peptide, bacterial endotoxin and sterility belong there too. Only one vendor reviewed on 2026-09-08 published separate endotoxin and sterility documents.
Are these products for human use?
No. GLOW, from any vendor named here or elsewhere, is intended solely for in-vitro laboratory research by qualified professionals. Nothing in this article describes any use in humans or animals, and comparing documentation is a quality-control exercise that has no bearing on the research-use-only status of the material.
For research use only. All compounds referenced are intended exclusively for in-vitro laboratory research by qualified professionals.
Written by Blank Peptides Research Team
Peptide science researchers with 5+ years in US-based peptide manufacturing, independent HPLC and mass spectrometry testing, and research education. All content is reviewed for scientific accuracy before publication.
REVIEWED BY
Dr. Tobias S — PhD Chemist, Peptide and Unnatural Amino Acid Synthesis
Dr. Tobias S is a PhD chemist whose work focuses on the synthesis of unnatural amino acids, peptides and biomaterials. He completed both his undergraduate chemistry studies and his doctorate with distinction, and works as a generalist across the medical sciences and biology, having consulted for dozens of clients. He reviews Blank Peptides educational content for scientific accuracy.
Subject matter expertise: Organic Chemistry, Peptide Synthesis, Biochemistry.
