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Molecular Weight
Purity
Storage
Appearance
Solubility
01
KLOW is a four-component research blend containing BPC-157, TB-500, GHK-Cu and KPV in a single lyophilized material. It is the GLOW blend with the addition of KPV, a tripeptide from the C-terminus of α-MSH. The amount of each component is stated on the product label and certificate of analysis.
The components range from about 0.34 to 5 kDa and include a copper complex, two tripeptides, a proline-rich 15-mer and a 43-residue polypeptide. This makes KLOW one of the most demanding samples in the catalogue for multi-analyte methods and co-formulation stability work. It is supplied as a reference material for in vitro and analytical research only.
02
The four components differ widely in size and chemistry.
BPC-157
Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val (1419.5 g/mol): proline-rich and acidic, with no aromatic or sulfur-containing residues; its Asp-Asp pair is its main weak point.
TB-500
Synthetic thymosin β4, 43 residues with an acetylated N-terminus (4963.4 g/mol). Its Met6 is the most oxidation-sensitive site in the blend; its only aromatic residue is Phe12.
GHK-Cu
Gly-His-Lys bound to copper(II) (401.9 g/mol), giving the material a faint blue tint and a distinctive copper isotope pattern in MS.
KPV
Lys-Pro-Val (342.4 g/mol), the smallest and one of the most polar components; its Lys-Pro N-terminus can cyclise to a diketopiperazine.
Size range
About 342 to 4963 Da, roughly a fourteen-fold range, which shapes chromatography and MS settings.
03
Research interest in KLOW focuses on how the four components behave together.
Copper-catalysed oxidation
Any copper released from GHK-Cu can catalyse oxidation of TB-500’s Met6 (+16 Da). Comparing TB-500 oxidation in KLOW, in GLOW and alone shows how strongly this occurs.
Co-lyophilisation
Drying four peptides together can change recovery, dissolution and aggregation compared with storing them separately.
Analytical interactions
Competition for column binding sites and ion suppression in electrospray can change how each component is detected in the mixture.
KLOW versus GLOW
Comparing the two blends shows whether adding KPV changes the stability or analysis of the shared three components.
Each constituent has its own research background, described on its individual reference page. No claims are made for the combination.
04
Four-component HPLC methods
Developing gradients that separate two very polar tripeptides, a mid-sized peptide and a ~5 kDa polypeptide in one run.
System suitability
Checking that detection and ionisation work for singly charged small peptides and multiply charged larger ones in the same analysis.
Forced degradation
Heat, humidity, oxidation and light studies to rank component stability within the shared matrix and identify blend-specific degradation products.
Comparative blend studies
Paired with GLOW to isolate the effect of adding KPV.
05
Storage
Store the sealed vial at −20 °C, desiccated. The material is moisture-sensitive; let the vial reach room temperature before opening.
Choosing pH
Each component prefers slightly different conditions: GHK-Cu loses copper under acidic conditions, BPC-157’s Asp-Asp pair isomerises fastest at mildly acidic pH, and KPV forms a diketopiperazine faster at neutral to basic pH. A pH of about 6–7, kept cold, with prompt use is the practical compromise.
Oxidation
Protect from air and light, and avoid chelators such as EDTA or reducing agents, which would strip copper from GHK-Cu. Light sensitivity is low overall, since only TB-500 carries an aromatic residue (Phe12).
Reconstitution
Dissolve in water or a mild buffer with gentle swirling, not vortexing.
Solutions
Use within one session or freeze single-use aliquots in low-binding polypropylene tubes; avoid repeated freeze–thaw cycles.
06
Each component is identified and quantified separately.
HPLC
Reversed-phase C18 or wide-pore C8 with a gradient starting at very low organic content, so that KPV and GHK-Cu are retained away from the void volume; HILIC can serve as an orthogonal method for the two small peptides. Detect at about 205–214 nm.
Mass spectrometry
TB-500 gives multiply charged ions (about +4 to +7), BPC-157 mainly +2 and +3, and KPV and GHK-Cu singly charged ions. GHK-Cu shows the ⁶³Cu/⁶⁵Cu pattern (2 Da apart, about 69:31), confirming the copper complex.
Component ratio
Each peak is quantified against its own reference standard by external calibration; LC-MS with matrix-matched standards, or stable-isotope-labelled internal standards, improves accuracy where co-elution or ion suppression occurs.
Impurity profile
Check each component against its own specification, plus blend-specific products: TB-500 Met6 sulfoxide, free GHK, BPC-157 isoAsp variants and cyclo(Lys-Pro) from KPV.
07
Four: BPC-157, TB-500, GHK-Cu and KPV. It is the GLOW blend with KPV added. The amount of each is stated on the product label and certificate of analysis.
Keep the sealed vial at −20 °C, desiccated, and let it reach room temperature before opening. After reconstitution at about pH 6–7, keep it cold, use it promptly or freeze single-use aliquots, and avoid chelators and reducing agents.
Reversed-phase HPLC with a low starting organic content and detection at 205–214 nm, HILIC as an orthogonal method for KPV and GHK-Cu, and LC-MS for identity, including the copper isotope pattern for GHK-Cu.
Its components span about 342 to 4963 Da and very different polarities, so one method must retain small polar peptides and elute a large polypeptide. Components can also affect each other through co-elution, ion suppression and copper-catalysed oxidation.
Each component is quantified against its own reference standard, by HPLC peak area or by LC-MS. Matrix-matched standards or isotope-labelled internal standards correct for co-elution and ion suppression, and results are compared with the label amounts.
No. It is supplied strictly as a reference material for laboratory and analytical research and is not for human or animal use.
KLOW Blend Research Reference. (2026). Pure Peptides Labs Research Catalogue. Retrieved from https://purepeptideslabs.net/research-catalogue/proprietary-research-blends/klow-blend/
Materials listed on this platform are supported by independent testing and published documentation for laboratory research contexts.
