derma stamp ghk cu GHK-Cu Revitalizing Serum 16oz-1 Gallon | Private Label Topical GHK-CU and microneedling :

They also do not work with retinoids. The best protocol would be to alternate a vitamin-C serum or a retinoid with copper peptides every other day

Kong et al., 2025)

Evidence type: Human RCT | Observational | Animal | In vitro | Regulatory Mechanism of Action As a copper chelator, GHK-Cu modulates over 4,000 human genes, upregulating those involved in tissue remodeling (e.g., collagen I, III) and downregulating pro-inflammatory pathways like NF-B

Immunofluorescence and Structured Illumination Microscopy Cells (typically 20,000) were grown on coverslips and after the indicated treatment fixed with formalin

A common approach uses 0.25mg in the morning and 0.25mg in the evening, maintaining more consistent tissue levels throughout the day