GHK-Cu Reconstitution & Dosage Protocol
Glycyl-Histidyl-Lysine-Copper Complex — Complete laboratory preparation guide
Ares Research Lab Team
Analytical Chemistry Division
READ TIME
6 MIN READ
Laboratory reconstitution protocol for GHK-Cu tripeptide-copper complex. Includes pH considerations, sterile water preparation, and research dosage ranges for skin regeneration and wound healing studies.
CAS NUMBER
89030-95-5
MOLECULAR FORMULA
C14H24N6O4 · Cu
MOLECULAR WEIGHT
403.9 g/mol
PURITY
≥ 99.0% (HPLC)
SEQUENCE
Gly-His-Lys (GHK) complexed with Cu²⁺
RECONSTITUTION PROCEDURE
GHK-Cu is highly water-soluble and reconstitutes rapidly. However, the copper complex is sensitive to oxidation and pH changes. Always verify pH after reconstitution for pH-sensitive applications.
Sanitize and Inspect
Wipe the vial septum with 70% isopropyl alcohol. Inspect the lyophilized cake for uniform blue-green color (GHK-Cu characteristic). Discoloration may indicate oxidation.
Draw Sterile Water
Use bacteriostatic water or pH-balanced sterile water (pH 6.5–7.5). Draw 3.0ml for standard 50mg vials or 5.0ml for 100mg vials.
Inject and Dissolve
Inject slowly down the vial wall. GHK-Cu dissolves almost instantly — swirl for 15–30 seconds only. Over-swirling may oxidize the copper complex.
Verify Clarity
The solution should be clear with a faint blue-green tint. If cloudy, brown, or precipitated, discard — this indicates oxidation or contamination.
GHK-Cu is exceptionally stable in its lyophilized form but degrades faster than linear peptides once reconstituted. Use within 7 days refrigerated or aliquot and freeze at -20°C within 24 hours.
CONCENTRATION & DOSAGE REFERENCE
RESEARCH DOSAGE RANGES
- →Fibroblast proliferation assays: 1–10 nM (0.4–4 mcg/ml) in complete media, 24–72 hour observation
- →Collagen synthesis studies: 10–100 nM in fibroblast cultures, assessed by hydroxyproline assay
- →Wound healing ex-vivo: 0.1–1.0 mcg/ml in explant media, refreshed daily
- →Anti-inflammatory assays: 1–100 nM in LPS-stimulated macrophage models, IL-6/TNF-α ELISA readout
pH & COPPER STABILITY
The GHK-Cu complex is most stable between pH 6.5 and 7.5. Outside this range, copper may dissociate or the peptide may hydrolyze.
- →Target pH: 6.5–7.5 (use pH-balanced water if available)
- →Do not expose to acidic buffers (pH < 5.0) — copper dissociates rapidly
- →Do not mix with reducing agents (ascorbic acid, glutathione) — reduces Cu²⁺ to Cu⁺
- →Avoid EDTA or other metal chelators — they strip the copper ion from the complex
- →Use amber or foil-wrapped vials to prevent photodegradation of the copper center
ANALYTICAL SPECIFICATIONS
REFERENCES & CITATIONS
1. Pickart, L. (2008). The human tripeptide GHK and tissue repair. Journal of Biomaterials Science, Polymer Edition, 19(8), 969–988.
2. Pickart, L. & Margolina, A. (2018). Regenerative and protective actions of the GHK-Cu peptide. International Journal of Molecular Sciences, 19(7), 1987.
3. Pickart, L. et al. (2015). GHK peptide as a natural modulator of multiple cellular pathways. Skin Pharmacology and Physiology, 28(3), 147–158.
4. Siméon, A. et al. (2000). Copper-GHK increases extracellular matrix synthesis. Life Sciences, 67(18), 2257–2265.
RESEARCH DISCLAIMER
All protocols are intended solely for qualified laboratory research professionals. Not for human use or consumption. For in-vitro and laboratory research only.
— QUICK SPECS
— RELATED PROTOCOLS
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BPC-157
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TB-500
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— FREQUENTLY ASKED QUESTIONS
Q: Why is GHK-Cu blue-green in color?
The blue-green color is characteristic of the GHK-Cu²⁺ complex. The copper ion bound to the Gly-His-Lys sequence creates a distinctive chromophore. If your reconstituted solution is brown, colorless, or yellow, the complex may have degraded.
Q: Can GHK-Cu be mixed with other peptides in the same vial?
Not recommended. GHK-Cu can chelate with other metal ions and may interact with peptides containing histidine or cysteine residues. Reconstitute separately and combine only at the point of application.
Q: What happens if the pH is too low or too high?
At pH < 5, the copper ion dissociates from the GHK peptide. At pH > 8.5, the copper may precipitate as copper hydroxide. Always verify pH is within 6.5–7.5 for maximum complex stability.
Q: How do I measure nanomolar concentrations for cell culture?
GHK-Cu MW = 403.9 g/mol. A 1 nM solution = 0.404 mcg/ml. For a 10 nM working solution: dissolve 4.04 mcg in 1.0ml media. Use serial dilutions from a 10 mcg/ml stock for accuracy.
Q: Why is GHK-Cu less stable after reconstitution than BPC-157?
The copper center is redox-active and susceptible to oxidation/reduction reactions in solution. The Cu²⁺/Cu⁺ redox cycle can generate reactive oxygen species that degrade the peptide backbone over time.
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