KLOW Blend (BPC-157 / TB-500 / GHK-Cu / KPV) — wholesale 10-vial kits

Research context

"KLOW" is the market name for a four-peptide blend: BPC-157, TB-500, the copper tripeptide GHK-Cu and KPV. It is the GLOW blend — BPC-157, TB-500 and GHK-Cu — with KPV added as a fourth component. No pharmacopeia or regulator defines KLOW as a standard formulation; it is a trade label, so component amounts and ratios differ between suppliers, which is the first thing to pin down from the label and the certificate. This product is supplied at 80 mg total per vial, and the per-component content is stated on the lot COA rather than printed as a fixed split here, because the split is not independently confirmed.

The four are grouped because their published mechanisms sit at different points of the same tissue-remodeling models. GHK-Cu has the longest record: the tripeptide glycyl-L-histidyl-L-lysine was first reported in 1973 in Biochemical and Biophysical Research Communications as a factor increasing survival of cultured normal liver cells, and a 2008 review in the Journal of Biomaterials Science collects its matrix-remodeling literature. BPC-157 is studied mainly in angiogenesis and fibroblast-migration assays, and TB-500 is the N-terminally acetylated 17–23 fragment of thymosin beta-4, the actin-binding motif implicated in cell migration. KPV is the C-terminal tripeptide of α-MSH, Lys-Pro-Val, studied for signaling that suppresses NF-κB and pro-inflammatory cytokine output in epithelial and immune cell lines, an activity that sets it apart from the three repair-associated peptides in GLOW. Comparative and combination designs in cell and tissue models are how a four-component set is normally used, with each single compound run alongside as a comparator.

Pre-blended material has three practical advantages. The ratio is fixed at manufacture, so every vial is the same. A four-component study needs one reconstitution per vial instead of four. And one lot COA documents all four molecules: LC-MS identity is confirmed for each component, and RP-HPLC purity is reported for each component, under one lot code.

What to check on the certificate, component by component. For GHK-Cu: that identity is reported for the copper(II) complex rather than the free apo-GHK peptide — the copper adduct and the metal-free peptide differ in mass and in UV–visible absorbance, and copper stoichiometry is the usual point of confusion. For TB-500: the mass against the acetylated thymosin beta-4 17–23 fragment, not the full-length 43-residue protein, since the acetyl group adds 42 Da and full-length material is a known mislabeling. For BPC-157: the mass against the 15-residue sequence. For KPV: the mass against the Lys-Pro-Val tripeptide, small enough that counter-ion mass is a large fraction of the total. For all four: individual per-peak RP-HPLC purity rather than a blend total, counter-ion and net peptide content for each, and the stated amounts against the label.

Regulatory position, stated factually: none of the four components is an FDA-approved drug, and this blend is not a drug product. FDA's compounding tables list GHK-Cu, BPC-157, the thymosin beta-4 17–23 fragment and KPV among nominated bulk drug substances, with several nominations withdrawn by the nominators, and the HHS interim enforcement-discretion notice published in the Federal Register on October 30, 2026 addresses certain peptide bulk substances in 503A compounding pending rulemaking — it is addressed to licensed compounders and is not an approval. Per-component amounts are stated on the lot COA. WholesalePeptide.us supplies this blend as a research reference material for in-vitro, analytical and preclinical laboratory research.

GHK-Cu gives the lyophilized cake and the reconstituted solution a blue tint, which is normal and comes from the copper complex. For a custom ratio, for the three-component set without KPV, or for each peptide alone as a comparator, order GLOW or the single-compound kits (BPC-157, TB-500, GHK-Cu, KPV) and combine them in your lab.

Research areas

• tissue-remodeling models using paired and grouped peptides
• angiogenesis and cell-migration assays
• NF-κB and cytokine signaling in epithelial cell models
• copper-peptide coordination chemistry
• multi-component LC-MS identity testing
• per-component counter-ion and net-peptide-content checks

Handling and storage

• Store lyophilized vials at −20 °C, sealed, protected from light and moisture.
• Let the vial equilibrate to room temperature before opening to limit condensation.
• Reconstitute in an appropriate sterile buffer or solvent according to your laboratory SOP.
• The blue tint comes from the GHK-Cu copper complex. Reconstitute the whole vial once; all four components are then in solution together. Aliquot and avoid repeated freeze–thaw.