GHK-Cu Dosing & Protocols — Research Reference

GHK-Cu is a copper-binding tripeptide (glycyl-L-histidyl-L-lysine) extensively studied across wound healing, hair follicle, anti-fibrotic, and cosmetic-research models. Dosing varies sharply by route of administration.

Reconstitution for Research

GHK-Cu is typically supplied as a deep-blue lyophilized powder (the copper chromophore confirms intact coordination). A 50 mg vial reconstituted with 5 mL bacteriostatic water yields 10 mg/mL. For topical research, dilution into a carrier base (often 1–3 mg per mL of vehicle) is standard. Reconstituted aqueous solution is stable refrigerated for 30+ days; topical formulations should be batched in opaque containers because GHK-Cu is light-sensitive.

Reference Dose Ranges in Published Research

| Route | Typical range | Notes | |---|---|---| | Topical (skin / scalp models) | 0.05%–0.2% (w/v) in carrier | Most-cited tier across cosmetic and follicle research | | Subcutaneous (systemic models) | 1–3 mg per dose | Used in wound, anti-fibrotic, and systemic gene-expression studies | | Intradermal (localized) | 100–500 mcg per site | Localized fibroblast and follicle studies |

Scheduling

Topical protocols use once- or twice-daily application to the model site. Subcutaneous research typically runs once daily; some wound-model studies use every-other-day dosing because GHK-Cu signalling produces durable gene-expression changes that persist beyond plasma clearance. Cycling is rarely reported because tolerance/receptor downregulation has not been described.

Copper Saturation and Identity

GHK-Cu's mechanism depends on intact copper coordination. Material that has lost the copper ion (visible as fading of the blue color) reverts to free GHK and behaves differently in published models. Mass-spec confirmation should show the copper-saturated mass (M+62 vs free GHK at 340.4 Da). UV-Vis absorbance with a peak around 525 nm is the standard confirmation of intact Cu-coordination.

Quality Verification

HPLC purity ≥98% and ICP-MS or AAS confirmation of stoichiometric copper content (1:1 mol/mol) are the most-cited acceptance criteria. Endotoxin testing applies for parenteral animal models.

Research Use Only. All content is for laboratory research and educational reference. Compounds discussed are not intended for human or veterinary consumption, prophylactic, or therapeutic use.

References

1. Pickart L, Vasquez-Soltero JM, Margolina A. GHK Peptide as a Natural Modulator of Multiple Cellular Pathways in Skin Regeneration. Biomed Res Int. 2015;2015:648108.
2. 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(7):1987.
3. Hostynek JJ, Dreher F, Maibach HI. Human stratum corneum penetration by copper: in vivo study after occlusive and semi-occlusive application of the metal as powder. Food Chem Toxicol. 2006;44(9):1539–1543.