In vitro observations on the influence of copper peptide aids for the LED photoirradiation of fibroblast collagen synthesis
Human fibroblasts in culture were exposed to red light and copper-GHK. The authors measured cell viability and collagen-related laboratory markers.
Study limitations
Human-derived cells in a dish are not a human trial. Combined light and peptide exposure complicates attribution, and the findings do not validate injectable use.
