GHK-Cu (Copper Tripeptide-1) vs GLOW Stack (GHK-Cu + TB-500 + BPC-157)

GHK-Cu (Copper Tripeptide-1)

GHK-Cu is the copper(II) complex of glycyl-L-histidyl-L-lysine, a tripeptide first isolated from human plasma. The free peptide binds copper with high affinity, and the complex is also known by the ingredient name copper tripeptide-1. Published work falls into three groups: cell-culture studies with fibroblasts and other skin-derived cells, wound and tissue models in animals, and a smaller number of studies of topical preparations in human volunteers. The human studies are mostly small and come from cosmetic research rather than controlled clinical trials. Reports that it alters the expression of large numbers of genes rest largely on reanalysis of gene-expression data from cultured cell lines, which shows association rather than a demonstrated effect in tissue.

GLOW Stack (GHK-Cu + TB-500 + BPC-157)

This product is a blend of three research peptides, GHK-Cu, TB-500 and BPC-157, supplied together in a single preparation. GHK-Cu is the copper(II) complex of the tripeptide glycyl-histidyl-lysine, first isolated from human plasma. TB-500 is the synthetic seven-residue fragment Ac-LKKTETQ, copied from the actin-binding region of thymosin β4. BPC-157 is a synthetic 15-residue peptide whose sequence was taken from a protein described in gastric juice. Each has its own literature, mostly in cell culture and animal models, but no published study has tested the three together, and there are no data on their stability or behaviour as a mixture.

How GHK-Cu (Copper Tripeptide-1) acts

GHK holds copper(II) through the amino nitrogen of glycine, a deprotonated backbone nitrogen and the imidazole ring of histidine, giving a complex that is stable at neutral pH. One proposed role is as a carrier that moves copper between plasma proteins and cells. Copper is a cofactor for lysyl oxidase, the enzyme that cross-links collagen and elastin, and fibroblast culture studies have reported changes in collagen and glycosaminoglycan synthesis on exposure to the complex. Animal wound studies have also looked at blood-vessel formation and inflammatory markers. How much of the reported activity belongs to the peptide and how much to the copper it carries has not been settled.

How GLOW Stack (GHK-Cu + TB-500 + BPC-157) acts

No mechanism has been described for the blend itself, so only the components can be discussed, each on its own evidence. GHK binds copper(II) with high affinity, and the complex has been examined in fibroblast cultures for changes in collagen and glycosaminoglycan synthesis. Thymosin β4 binds monomeric actin and regulates how much is available for filament assembly; TB-500 copies LKKTETQ, the short sequence at the centre of that binding region, and how far the fragment shares the binding is not well established. The mode of action of BPC-157 is unsettled, with rodent and cell studies examining nitric oxide signalling and VEGF receptor pathways. Whether the three interact with one another has not been investigated.

The records side by side

• Type: GHK-Cu (Copper Tripeptide-1), Copper tripeptide complex; GLOW Stack (GHK-Cu + TB-500 + BPC-157), Three-peptide blend
• Length: GHK-Cu (Copper Tripeptide-1), 3 amino acids; GLOW Stack (GHK-Cu + TB-500 + BPC-157), not recorded
• Molecular weight: GHK-Cu (Copper Tripeptide-1), 400.90 g/mol; GLOW Stack (GHK-Cu + TB-500 + BPC-157), not recorded
• Molecular formula: GHK-Cu (Copper Tripeptide-1), C14H21CuN6O4-; GLOW Stack (GHK-Cu + TB-500 + BPC-157), not recorded

Reading a comparison

A comparison places two records side by side; it does not merge them. Each description above is drawn from that compound's own record, and the two were not necessarily characterised by the same methods, at the same time, or to the same level of detail. Before comparing any attribute, it is worth establishing that both records describe the substance you think they describe — names are not identifiers, and two entries sharing a name can differ in salt form, stereochemistry or the convention used to state a mass. Where a figure carries no method beside it, the comparison is between two reported numbers rather than between two measurements.