What is KLOW Blend?
KLOW is the three-component GLOW composition with the tripeptide KPV added. KPV is H-Lys-Pro-Val-OH, CAS 67727-97-3, formula C16H30N4O4, molecular weight 342.44, corresponding to residues 11 to 13 of alpha-melanocyte-stimulating hormone. GHK-Cu is the copper(II) complex of glycyl-L-histidyl-L-lysine, molecular weight 403.92. BPC-157 is the 15-residue H-Gly-Glu-Pro-Pro-Pro-Gly-Lys-Pro-Ala-Asp-Asp-Ala-Gly-Leu-Val-OH at 1419.53. TB-500 is the acetylated seven-residue thymosin beta-4 fragment Ac-Leu-Lys-Lys-Thr-Glu-Thr-Gln-OH at 889.02.44. The mass range across the components spans roughly four fold, from a 342 dalton tripeptide to a 1419 dalton pentadecapeptide, which matters for chromatography and for how the vial behaves in solution. In the literature KPV is examined in epithelial and macrophage models for effects on inflammatory transcription, GHK-Cu in matrix-protein expression work, BPC-157 in rodent tissue-injury models and TB-500 in actin-binding assays.
The central question a blend invites remains open. No peer-reviewed study compares this four-component ratio against its individual constituents under matched conditions, so any claim that the combination exceeds four separate reagents is unsupported. Each component also carries open questions, including the absence of a confirmed receptor for BPC-157.
Reconstitution & handling
The cake is dissolved in bacteriostatic or sterile water introduced slowly down the inside wall of the vial, and a clear solution is expected within a minute of gentle swirling. Total concentration is the labeled 80 mg divided by the diluent volume, with components following the 10:50:10:10 ratio. Avoid vortexing, since the TB-500 chain foams and foaming drives surface denaturation.
Storage & stability
Unopened vials are held at -20 degrees Celsius, shielded from light and from moisture ingress, with the cake firm and dry to the touch. Reconstituted material is stored at 2 to 8 degrees Celsius, split into single-use aliquots at preparation, and kept out of repeated freeze-thaw cycles. The copper center is light sensitive, so amber glass suits anything beyond immediate use, and the methionine in TB-500 is oxidation prone, favoring minimal headspace.
How it's tested
Reverse-phase HPLC at 214 and 220 nanometres resolves four separate peaks, and the acceptance criterion is relative peak area against the declared 10:50:10:10 mass ratio rather than one combined purity number. Mass spectrometry confirms each component against theoretical mass, with the copper isotope envelope distinguishing complexed GHK-Cu from free tripeptide. Net peptide content is determined so the 80 mg figure reflects peptide rather than salt and water.