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Molecular Weight
Purity
Storage
Appearance
Solubility
01
GLOW is a three-component research blend containing BPC-157, TB-500 and GHK-Cu in a single lyophilized material. The amount of each component is stated on the product label and certificate of analysis.
The three peptides are very different: a 15-residue proline-rich peptide, a 43-residue acetylated polypeptide and a copper-bound tripeptide. This makes GLOW a demanding sample for multi-analyte analytical methods and a useful model for studying how peptides behave when formulated together, particularly with a metal-containing component present. KLOW is the related four-component blend that adds KPV. GLOW is supplied as a reference material for in vitro and analytical research only.
02
The three components span very different sizes and chemistries.
BPC-157
Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val (1419.5 g/mol): linear, proline-rich and acidic, with no aromatic or sulfur-containing residues. Its Asp-Asp pair is its main chemical weak point.
TB-500
Synthetic thymosin β4, 43 residues with an acetylated N-terminus (4963.4 g/mol). Highly charged, with a single methionine (Met6) that can oxidise.
GHK-Cu
The tripeptide Gly-His-Lys bound to copper(II) (401.9 g/mol). Copper is held by the N-terminal amine, a deprotonated backbone nitrogen and the histidine imidazole; the complex gives the material a blue tint.
Size range
From about 0.4 to 5 kDa, a more than tenfold range, which shapes chromatography and MS settings.
03
Research interest in GLOW focuses on how its components behave together.
Copper and oxidation
Copper ions can catalyse oxidation of susceptible residues. In GLOW, the most relevant target is Met6 of TB-500, especially if some copper is released from GHK-Cu. Tracking TB-500 oxidation in the blend versus TB-500 alone shows whether this occurs.
Copper retention
Whether GHK-Cu keeps its copper after drying and reconstitution affects both its own integrity and the stability of the other components.
Reconstitution behaviour
Co-formulation can change dissolution speed, recovery and aggregation compared with single components, particularly for the larger TB-500.
Component research
Each constituent has its own research background, described on its individual reference page. No claims are made for the combination.
04
Multi-analyte HPLC and LC-MS
A demanding sample requiring separation of a very polar metallopeptide, a mid-sized peptide and a ~5 kDa polypeptide in one run.
System suitability
Checks that detection and ionisation work across a wide mass and polarity range.
Co-formulation stability
Forced-degradation studies (heat, humidity, light, oxidation) comparing degradation of each component in the blend and alone.
GLOW versus KLOW comparisons
Comparison with the four-component KLOW shows whether adding KPV changes the stability of the shared components.
05
Storage
Store the sealed vial at −20 °C, desiccated and protected from light. The material is hygroscopic; let the vial reach room temperature before opening.
Reconstitution
Dissolve in water or a mild aqueous buffer with gentle swirling, not vortexing, to limit foaming and loss of TB-500.
Choosing pH
Near-neutral pH (around 6.5–7.5) is the best compromise: GHK-Cu loses copper under acidic conditions, while BPC-157’s Asp-Asp pair isomerises fastest at mildly acidic pH, and strongly basic conditions promote copper release.
Oxidation
Protect from light and air, and avoid reducing agents and chelators such as EDTA, which would strip copper from GHK-Cu.
Solutions
Use promptly 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 C8 (wide-pore helps TB-500) with a broad acetonitrile gradient starting at low organic content so that GHK-Cu is retained away from the solvent front. Detect at 214 nm for all components. In acidic TFA mobile phases, part of the GHK-Cu may dissociate, so free GHK can also appear.
Mass spectrometry
TB-500 gives multiply charged ions (around +4 to +7), BPC-157 mainly +2 and +3, and GHK-Cu a singly charged ion with the characteristic ⁶³Cu/⁶⁵Cu pattern (peaks 2 Da apart, about 69:31), which confirms the copper complex.
Component ratio
Peak areas calibrated against individual reference standards confirm the amount of each component against the label.
Impurity profile
Check each component against its own specification, plus blend-specific products such as TB-500 Met6 sulfoxide, free GHK and BPC-157 isoAsp variants.
07
GLOW contains three peptides: BPC-157, TB-500 and GHK-Cu. KLOW contains the same three plus KPV (Lys-Pro-Val). Component amounts for each product are given on its label and certificate of analysis.
Use water or a mild buffer at near-neutral pH (about 6.5–7.5), swirl gently rather than vortexing, and avoid chelators or reducing agents, which would affect GHK-Cu. Use the solution promptly or freeze single-use aliquots.
Reversed-phase HPLC on a C18 or wide-pore C8 column with a broad acetonitrile gradient starting at low organic content, detected at 214 nm, combined with LC-MS for identity. Each component is quantified against its own reference standard.
Compare each component’s response in the blend with its response when injected alone at the same concentration, or use post-column infusion to see where in the gradient suppression occurs. Matrix-matched calibration or standard addition then corrects for any suppression found.
Copper ions can catalyse oxidation of TB-500’s Met6. If any copper is released from GHK-Cu, the methionine sulfoxide (+16 Da) can increase, so it is worth monitoring in blend stability studies.
No. It is supplied strictly as a reference material for laboratory and analytical research and is not for human or animal use.
GLOW Blend Research Reference. (2026). Pure Peptides Labs Research Catalogue. Retrieved from https://purepeptideslabs.net/research-catalogue/proprietary-research-blends/glow-blend/
Materials listed on this platform are supported by independent testing and published documentation for laboratory research contexts.
