Research Overview

The GHK peptide is a naturally occurring tripeptide — glycyl-L-histidyl-L-lysine — first identified in human plasma, where its concentration is observed to decline with age. “GHK Basic” refers to the metal-free apo-peptide: the GHK sequence supplied without a bound copper ion, in contrast to the pre-formed GHK-Cu complex. In this metal-free form the peptide is studied as a research tool for examining copper coordination chemistry, gene-expression effects, and tissue-remodeling pathways under controlled laboratory conditions.

Molecular Structure and Copper Coordination

The GHK sequence (Gly-His-Lys) presents a well-characterized copper(II)-binding motif. The N-terminal glycine amino group together with the histidine imidazole nitrogen coordinate Cu²⁺ in a square-planar geometry with very high affinity (stability constant on the order of 10¹⁶). Because the apo-peptide is supplied metal-free, researchers can study copper binding from the unbound starting state — introducing defined amounts of copper in vitro to follow complex formation, or examining copper-independent activity of the peptide directly.

Research Applications

In preclinical and in vitro research, the GHK tripeptide is examined for roles in extracellular-matrix remodeling, collagen synthesis and matrix-metalloproteinase regulation, antioxidant and anti-inflammatory signaling, and gene-expression modulation. Tissue-repair investigations frequently position GHK alongside BPC-157 and TB-500, which are studied for complementary repair-related mechanisms, providing researchers a panel of small peptides for comparative work.

Relationship to GHK-Cu

The defining difference between GHK Basic and GHK-Cu is the copper ion. GHK Basic is the metal-free peptide (CAS 49557-75-7); GHK-Cu is the pre-formed peptide–copper(II) complex (CAS 89030-95-5), recognizable by its characteristic blue-green color. Supplying the apo-peptide lets a laboratory control the copper stoichiometry itself rather than receiving a fixed pre-formed complex.

Laboratory Handling

GHK Basic is supplied as a white lyophilized (freeze-dried) powder, soluble in water and standard aqueous buffers. The lyophilized format limits solution-phase degradation during storage and supports precise gravimetric preparation of research concentrations at the point of use. The powder is kept sealed, cold, and protected from light and moisture until use. Each batch is third-party tested with a Certificate of Analysis.