Glow

Glow is a blend rather than a single compound: GHK-Cu, BPC-157 and TB-500 supplied together in one vial. It is the same set as KLOW without the KPV. Because it is a mixture it has no single CAS number, molecular formula or molecular weight, and any listing that gives it one is describing something else.

The three components are chemically unlike one another. GHK-Cu is a copper(II) coordination complex of the tripeptide glycyl-L-histidyl-L-lysine, with the metal held by three nitrogen donors and a fourth, labile equatorial site. BPC-157 is a fifteen-residue free-acid peptide. TB-500 is a seven-residue N-terminally acetylated fragment of thymosin beta-4. A single analytical run has to resolve a metal complex against two peptides of very different size, which is why identity work on blends of this type is done by a separation method rather than by a single spectroscopic reading.

None of the three carries a cysteine, methionine or tryptophan, so the vial contains no oxidation-prone side chain and no aromatic chromophore, and absorbance at 280 nm will not report concentration for any component. The copper centre, by contrast, is redox-active and gives the blend a genuine chemical sensitivity that the peptides alone would not have: it should be kept cold, dry and near neutral pH.

No published study characterises the three-component mixture as an entity. The citations shown on this page are papers about the individual components, and the site marks them as such, because publishing component literature under a combination product without that label is one of the specific failures this catalogue is built to avoid.

As with the other blends, the vial label states a combined mass rather than a mass per component, so a per-milligram figure would not mean what a reader comparing it against a single compound would assume, and none is published.