Klow Peptide: What It Is, What's In It & Where to Buy (2026)

Research Use Only. This article is for informational purposes for qualified researchers. Compounds discussed are not drugs or supplements and are not for human or veterinary use.

What is the Klow peptide?

Klow is a four-peptide research blend containing GHK-Cu, KPV, BPC-157, and TB-500 in a single lyophilized vial. In the standard 80mg presentation the split is GHK-Cu 50mg, KPV 10mg, BPC-157 10mg, and TB-500 10mg. It is supplied for laboratory research use only and is not for human or veterinary use.

Lysine-proline-valine, an α-MSH fragment

Body protection compound-157

Component	Amount per vial	Also known as
GHK-Cu	50 mg	Copper tripeptide-1
KPV	10 mg	Lysine-proline-valine, an α-MSH fragment
BPC-157	10 mg	Body protection compound-157
TB-500	10 mg	Thymosin beta-4 fragment
Total	80 mg	Single lyophilized vial

Klow Peptide Blend: 50mg/10 /10/10 (GHK-CU, KPV, BPC-157, TB-500)

What’s Inside Klow: The Four Components

This guide covers what Klow contains, how the 80mg labeling works, how Klow differs from the Glow blend, and how to verify purity before sourcing.

Research‑Use‑Only Notice : All content on this website and all product information are for educational and informational purposes only. All products referenced are for laboratory research, analytical, and in‑vitro use only. They are not medicines or drugs, have not been evaluated or approved by the FDA, and are not intended to diagnose, treat, cure, or prevent any disease. Any bodily introduction into humans or animals is strictly prohibited.

Klow is a formulation name, not a compound. It refers to a vial containing four separate research peptides that have been lyophilized together rather than sold individually. The name is an acronym drawn from its components, and it is a supplier SKU identifier rather than a designation with any regulatory or clinical meaning.

Details	Klow Blend	Glow Blend
Components	GHK-Cu, KPV, BPC-157, TB-500	GHK-Cu, BPC-157, TB-500
Number of peptides	4	3
Distinguishing component	KPV	None additional
Typical total mass	80 mg	Varies by supplier
Appearance	Blue lyophilized powder	Blue lyophilized powder
Format	Single lyophilized vial	Single lyophilized vial
Intended use	Laboratory research only	Laboratory research only

Klow Peptide Vial from OmniPept Global with Third-Party COAs.

GHK-Cu (50 mg)

The Klow peptide is a four-peptide research blend. It includes:

Blends exist for a practical reason. A laboratory studying four peptides individually has to source four vials and account for four sets of handling and documentation variables. A single-vial blend consolidates that into one lot with one certificate.

Lyophilization is freeze-drying. Removing water from the peptide solution leaves a dry powder that is far more stable in storage than a liquid, which is why nearly all research peptides ship in this form. Klow arrives as a dry cake in a sealed glass vial.

GHK-Cu 50mg Copper Peptides available online at OmniPept Global.

KPV (10 mg)

One visual detail is worth knowing before a vial arrives. Klow is blue. Most lyophilized peptides are white to off-white powders, but GHK-Cu is a copper-binding tripeptide, and the bound copper gives the finished blend a distinctly blue appearance. Certificates of Analysis for the blend record appearance as “blue lyophilized powder.” A blue vial is expected here and is not a sign of contamination or degradation.

Klow Blend has not been evaluated or approved by the FDA. It is not a drug and is not intended for human or veterinary use. Suppliers like OmniPept Global selling it for laboratory research state this clearly.

Each of the four peptides in Klow is a chemically distinct compound. They are not four versions of the same thing.

BPC-157 (10 mg)

Related single-compound reference: GHK-Cu copper peptide.

KPV is the component that distinguishes Klow from the Glow blend, covered in detail below.

Related single-compound reference: KPV 10mg.

TB-500 / Thymosin Beta-4 (10 mg)

Related single-compound reference: BPC-157.

Certificates of Analysis for Klow list this component under its full name, thymosin beta-4, rather than the TB-500 shorthand.

Related single-compound reference: TB-500 (Thymosin Beta-4).

Why Klow Is Labeled 80mg

Searches for “klow 80mg” and “klow 80” are common, and the number causes confusion.

80mg is the total peptide mass in the vial , arrived at by adding the four components together: 50 + 10 + 10 + 10. It describes fill quantity. Two vials both labeled 80mg from different suppliers can contain different ratios, so the component breakdown matters more than the headline number.

The shorthand “50/10/10/10” refers to the same thing, listing each component in order: GHK-Cu 50mg, KPV 10mg, BPC-157 10mg, TB-500 10mg. Suppliers use the two labels interchangeably.

Klow vs Glow: A Klow Peptide Vial and Glow Peptide Vial side by side.

Klow vs Glow: What’s the Difference?

Because the components are present at different masses, the vial should not be read as a single uniform 80mg unit; the per-component figures on the batch-specific Certificate of Analysis are the reference values.

This is the most common comparison question in the category, and the answer is short: Glow contains three peptides, Klow contains four. The difference is KPV.

GHK-Cu, KPV, BPC-157, TB-500

Klow Peptide Blend COA from OmniPept Global

How Klow Blend Is Tested

Both blends share the same three-peptide components of GHK-Cu, BPC-157, and TB-500. Klow adds KPV, the α-MSH fragment.

Both blends appear blue for the same reason, since both contain GHK-Cu.

Compare specifications directly: Klow Blend and Glow Blend.

How Long Do Peptides Last in Powder Form?

What to check on any Klow certificate

A blend introduces a verification problem that single compounds do not have. With four peptides in one vial, a purity figure alone says nothing about whether all four are present at the stated masses. A meaningful Certificate of Analysis for a blend has to confirm identity for each component, report purity, and verify net content per peptide.

The most recent Klow Blend Certificate of Analysis published by OmniPept Global from independent third-party testing, covering lot PH-KO80-0309, illustrates what that looks like in practice.

Laboratory and method. The analysis above was performed by Independent third-party analytical laboratory, an independent US laboratory named on the certificate and signed by the analyst who ran it. Purity was measured by HPLC with UV detection coupled to mass spectrometry, and bacterial endotoxin was tested using a Limulus Amebocyte Lysate assay under validated conditions.

GHK copper peptides chemistry profile featuring a OmniPept GHK-Cu 50 mg vial and third-party certificate of analysis showing 99.84% purity.

Where to Source Klow Blend in the US

Purity. Two vials from the lot were assayed independently rather than as a single composite sample, returning 99.81% and 99.84% by HPLC area percent for a reported average of 99.83%.

Identity. Mass identification confirmed all four components: GHK-Cu, KPV, BPC-157, and thymosin beta-4. This is the check that matters most for a blend, because it confirms the vial contains what the label claims rather than a subset.

Net peptide content. Publishing per-component content is the only way to confirm a blend is not underfilled on its smaller constituents. Because measured content varies by lot, the batch-specific Certificate of Analysis rather than the label mass is the authoritative record of per-component content.

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Klow Peptide Blend FAQs

Endotoxin. Two replicates, both passing. Endotoxin matters because bacterial contamination can confound laboratory assay results independently of the material being tested.

Appearance. Recorded as blue lyophilized powder, consistent with the copper content of GHK-Cu.

Batch history. Three independent tests are on file for this product, showing 99.83% for lot PH-KO80-0309 reported May 2026, 99.597% for lot cs-k0801012 reported February 2026, and 99.68% for a lot reported November 2025. Retained batch history matters because it lets a laboratory trace material purchased months earlier rather than seeing only the current lot.

What Does RUO Mean? Research Use Only Peptides Explained

What is the Klow peptide?

Regardless of supplier, the following separate a useful certificate from a decorative one:

Background reading: what a peptide Certificate of Analysis actually shows. Every published OmniPept result is searchable in the COA library and can also be viewed in the test results archive.

Klow is sold by research peptide suppliers, so sourcing decisions come down to what a supplier will document.

Peptide research guide on cloudiness and gelled issues

What is in Klow blend?

The practical checks are the same ones covered above. Does the supplier publish a per-lot certificate rather than a catalog-wide claim? Is the testing laboratory named? Can the certificate be read before purchase, or is it not publicly available? Does the certificate confirm identity for all four components and report net content per peptide? Is there retained batch history, or only the current lot?

OmniPept Global supplies the Klow Blend in an 80mg vial at GHK-Cu 50mg, KPV 10mg, BPC-157 10mg, TB-500 10mg, with certificates published openly. Testing is performed by Independent third-party analytical laboratory across HPLC-UV purity, LC-MS identity, and endotoxin analysis, with results published per lot.

The full catalog of research compounds is available in the OmniPept Global peptide shop, and every published result across all products is in the COA archive.

Where to buy CJC-1295 and Ipamorelin blend in 2026, ten research peptide suppliers compared by purity testing and cost per mg

What is the difference between Glow peptides and Klow?

View the latest Klow Blend COA published at OmniPept Global. Browse our catalog to procure research peptides with transparent specs and testing.

Klow is a four-peptide research blend containing GHK-Cu, KPV, BPC-157, and TB-500 in a single lyophilized vial. In the standard 80mg presentation the split is GHK-Cu 50mg, KPV 10mg, BPC-157 10mg, and TB-500 10mg. It is a supplier formulation name rather than a single compound, and it is supplied for laboratory research use only. See the Klow Blend product page for chemical details.

Four peptides. GHK-Cu at 50mg, a copper-binding tripeptide. KPV at 10mg, a tripeptide fragment of α-MSH. BPC-157 at 10mg, a gastric-derived pentadecapeptide. And TB-500 at 10mg, a peptide related to thymosin beta-4. Certificates of Analysis from OmniPept Global confirm identity for each of the four separately, and per-component net content is reported on lot PH-KO80-0309.

OmniPept Global research product illustration

Why is Klow blend blue?

Klow contains four peptides and Glow contains three. Both share GHK-Cu, BPC-157, and TB-500. Klow adds KPV, an α-MSH fragment. That single component is the entire difference between the two formulations. Neither name is standardized across the industry, so component ratios can vary between suppliers under the same blend name.

GHK-Cu binds copper, and the bound copper gives the finished powder a blue color. Certificates of Analysis for Klow record appearance as blue lyophilized powder. Most research peptides are white to off-white, so a blue vial is specific to copper-containing formulations and is expected rather than a defect.

It is the total peptide mass in the vial, calculated by adding the four components: 50 + 10 + 10 + 10. It describes fill quantity. The same total can be reached with different ratios, so the component breakdown carries more information than the headline number. The shorthand “50/10/10/10” describes the identical specification.

What does 80mg mean on a Klow vial?

At OmniPept Global, purity is measured by HPLC with UV detection, identity is confirmed by mass spectrometry for each of the four components, and bacterial endotoxin is tested using a Limulus Amebocyte Lysate assay. On the most recent published lot, two vials were assayed independently, returning 99.81% and 99.84% for an average of 99.83%, with net peptide content reported separately for each of the four components.

From research peptide suppliers like OmniPept Global that publish per-lot documentation. The checks worth applying are whether the certificate names its testing laboratory, whether it can be read before purchase, whether it confirms identity for all four components rather than reporting purity alone, and whether batch history is retained.

Disclaimer: Products sold by OmniPept Global are for laboratory research purposes only and are not intended for human consumption, medical use, or veterinary use. The information provided in this article is for in-vitro laboratory research only and is not intended for human or veterinary use. Nothing in this article is medical advice. Researchers must comply with all applicable federal, state, local, and institutional regulations and must obtain all necessary approvals prior to any experimental work.

How is Klow blend tested?

The OmniPept Global Analytical Team is an editorial and analytical group at OmniPept Global. The team reviews preclinical research literature, interprets Certificates of Analysis (COAs), and writes about analytical quality standards, with the goal of making purity verification and third-party testing data accessible to qualified research personnel and institutions. The team's work is editorial and analytical, focused on chemistry, sequence data, and COA documentation; nothing it publishes constitutes medical, veterinary, or clinical guidance.

Freeze-dried peptides stay stable for 2 to 5 years frozen at -20 °C (-4 °F) and 12 to 24 months in a fridge. At room temperature, expect weeks to a few months. Transit heat is rarely the problem: one to two weeks of ambient shipping causes no meaningful loss, and seven months at 45 °C…

Where can Klow blend be sourced in the US?

GHK-Cu is the copper(II) complex of glycyl-L-histidyl-L-lysine, a naturally occurring tripeptide first identified in human plasma in 1973. Most searches for GHK copper peptides point to this single molecule: a three-amino-acid sequence with an unusually strong affinity for copper ions, a distinctive blue color, and one of the longest research histories of any compound sold…

Where to buy MOTS-c in 2026 comes down to a question most suppliers would rather not answer: who tested this specific vial, and will they show the paperwork. Nearly every supplier in this category advertises MOTS-c at roughly 99% purity, so the advertised figure separates almost nobody. What separates them is whether that figure is…

Disclaimer

RUO stands for Research Use Only. It is an intended-use designation applied to materials sold for laboratory research, and it appears on most research peptides. RUO describes what a product is intended for, not how pure it is. It is not a safety certification, not a quality grade, and not an approval for human use….

References

Overview Newly reconstituted peptides occasionally appear cloudy, gelatinous, or particulate in aqueous buffer. Labs and qualified researchers unfamiliar with peptide chemistry sometimes interpret this as a quality defect on the lyophilized starting material. In most cases, the appearance reflects normal aggregation behavior of peptides rich in hydrophobic amino acid residues when those peptides are introduced…

Historical supplier pricing or fulfilment details from the source article were removed because they are not current OmniPept Global catalog data. Buyers should request a current quotation and destination-specific freight information.

Klow Peptide: What It Is, What’s In It, and Where to Source It

What is the Klow peptide?