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In this study we investigate the safety of copper complex of glycyl-L-histidyl-L-lysine (GHK-Cu), copper chloride (CuCl 2 ) and copper acetate (Cu(OAc) 2 ) by using in vitro skin irritation tests
Know precise wait times between layers, whether morning or evening application works better for your schedule, and how to troubleshoot pilling or irritation
The evidence is uneven: topical skin research is more developed than injectable GHK-Cu or broad systemic regeneration claims
however, it is recommended that individuals with sensitive skin or scalp should perform a patch test prior to regular application
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