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GHK-Cu reconstitution protocol
Reconstitution of GHK-Cu copper-tripeptide. Notes on preserving copper coordination, avoiding chelators, and reading the characteristic blue color as a stability indicator.
RECONSTITUTION & RESEARCH PROTOCOLS
Preclinical literature onlyResearch protocol intensities, summarized from published literature. The math is computed for the vial size you pick. Not a dosing recommendation.
Pickart's published work is mostly in-vitro and small-scale studies. No published RCTs for SC administration.
Reference research protocols from published peer-reviewed studies. Each card cites its source. This calculator is not a dosing recommendation. For research use only. Selection of any specific protocol is the responsibility of the qualified investigator under appropriate institutional oversight.
This protocol describes the reconstitution and storage of lyophilized GHK-Cu (copper tripeptide-1) in standard research workflows. GHK-Cu is a copper-bound tripeptide complex (Gly-His-Lys with a Cu²⁺ ion) — the copper coordination is functional, not incidental, and changes how the molecule should be handled compared to peptide-only compounds. Values below are derived from published handling literature; experimental design parameters are the responsibility of the qualified investigator.
At a glance
| Parameter | Value |
|---|---|
| Recommended diluent | Bacteriostatic Water (USP, 0.9% benzyl alcohol) |
| Recommended volume (50 mg vial) | 2.0 mL |
| Final concentration | 25 mg/mL |
| Stability — lyophilized | ≥24 months at -20 °C, sealed, light-protected |
| Stability — reconstituted | 30 days at 2–8 °C, light-protected (color sensitivity) |
| Solution appearance | Clear, characteristic deep blue from Cu²⁺ coordination |
Procedure
- Equilibrate the vial to room temperature.
- Sterile prep: wipe stopper with isopropyl. Use sterile syringe and needle.
- Inject diluent slowly along the inner wall. The lyophilized cake of GHK-Cu has a pale blue-violet color that intensifies on dissolution.
- Swirl gently. Do not shake — agitation can promote oxidation of the copper coordination sphere.
- Verify: reconstituted solution should be clear with a distinctive blue color — this is the spectroscopic signature of copper-tripeptide coordination and is the expected appearance. A faded or absent blue color suggests copper has dissociated; do not use.
Compound notes
The copper is what makes GHK-Cu biologically active. The bare GHK tripeptide is significantly less active than the copper-coordinated form — the Cu²⁺ ion functions as a structural and catalytic center. Two practical implications:
- Avoid strong reducing agents in any buffer system you may dilute into. Copper coordination is sensitive to redox conditions. Reducing agents (DTT, β-mercaptoethanol, ascorbate at high concentration) can dissociate the copper.
- Avoid chelators like EDTA in any dilution buffer. EDTA strips copper from the complex, inactivating it.
Standard biological buffers (PBS, saline, cell culture media) are fine. The blue color is your visual stability indicator — as long as the solution is blue, copper is bound.
Storage
Reconstituted GHK-Cu is stable for approximately 30 days at 2–8 °C in the original vial, light-protected. For longer storage, aliquot into sterile single-use tubes and freeze at -20 °C or colder. Lyophilized stability is ≥24 months at -20 °C light-protected.
Notes
This protocol describes reconstitution parameters from published peptide-handling literature. It is not a recommendation for any specific study design. For research use only. Not for human consumption.
References
- Pickart L, Margolina A. Regenerative and Protective Actions of the GHK-Cu Peptide in the Light of the New Gene Data. Int J Mol Sci 2018;19:1987. PMID: 29986520
- Pickart L. The human tripeptide GHK and tissue remodeling. J Biomater Sci Polym Ed 2008;19:969–988. PMID: 18644225
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