GHK-Cu

About This Research Material

This listing supplies GHK-Cu — the copper(II) complex of the tripeptide glycyl-L-histidyl-L-lysine — as a lyophilized reference material for in-vitro and preclinical laboratory work. Unlike a metal-free peptide, GHK-Cu is a coordinated metallopeptide: the histidine imidazole nitrogen, the terminal glycine amine, and adjacent backbone atoms form a chelation site that holds a single copper(II) ion in a stable but exchangeable configuration. That bound copper gives the solid its characteristic blue tint and defines much of the compound's chemistry, so laboratories treat it as a copper complex rather than a simple linear tripeptide when planning identity checks, solvent selection, and storage.

The material is intended for researchers characterizing copper-peptide behavior on the bench. It is used as an isolated standalone compound and, in some catalogs, as the copper-peptide component of multi-sequence research blends where matrix-model interactions are studied under controlled conditions. All descriptions below concern the research substance itself — its documented study history, its analytical fingerprint, and standard handling of freeze-dried peptide reference material — and are not statements about outcomes in humans or animals.

What Has Been Studied

GHK was first isolated from human plasma in the 1970s, and its reported age-related change in biological fluids helped establish it as a recurring subject in matrix-biology and copper-chemistry research. The evidence base is preclinical and in-vitro; the summaries below describe observations in laboratory models, not effects in people, and remain preliminary and ongoing rather than settled.

• Copper-coordination chemistry: physical studies have quantified copper-binding affinity, complex stability, and redox behavior, and have compared the GHK chelation motif to copper coordination in serum albumin.
• Copper-transport hypotheses: preclinical work has explored whether GHK acts as a carrier that shuttles copper toward copper-dependent enzymes and copper-binding proteins under experimental conditions.
• Cell-culture gene expression: fibroblast and skin-model systems have been used to examine concentration-dependent shifts in extracellular-matrix and antioxidant-response gene expression in vitro.
• Tissue-model and formulation studies: explant and animal models have historically probed tissue-repair signaling, while analytical work has characterized how the copper complex behaves across buffer systems used in benchtop assays.

Analytical Characterization

For reproducible work, identity and purity of a copper-peptide standard matter as much as the sequence. GHK-Cu is typically assessed by reversed-phase HPLC to quantify peptide purity, with mass spectrometry used to confirm molecular identity and the expected copper-complex mass. Because the coordinated copper ion alters chromatographic retention and ionization relative to the metal-free peptide, analytical methods for GHK-Cu are usually documented separately, and reviewers should confirm that a reported purity reflects the copper complex rather than the apo-peptide.

A batch-specific certificate of analysis (COA) generally reports the HPLC purity percentage and the mass-spectrometry identity confirmation, and may include water content or residual-solvent data for the lyophilized powder. Because purity, counterion, and copper stoichiometry can vary between manufacturing lots, laboratories are encouraged to review the lot-specific COA rather than a generic specification, and to retain it alongside experimental records to support traceability and reproducibility.

Laboratory Handling

The following describes conventional handling of lyophilized research peptides and is not instruction for human or animal use. Sealed GHK-Cu powder is kept protected from light, humidity, and heat. Because the complex carries a redox-active copper ion, exposure to light and oxidizing conditions is minimized, and solvent choice is documented per protocol since certain buffer components can interact with the copper center. Reconstituted and working solutions are prepared fresh where possible and handled under the temperature conditions shown in the storage specifications on this page.