Frontiers Copper toxicity and deficiency: the vicious cycle at the core of protein aggregation in ALS The GHK Cu pen works. But needles at home were never the answer. We took the same clinically backed copper peptide complex and put it into a serum you can use in 30 seconds, Copper Peptide (GHK Cu): Clinical Uses, Stability & Compounding Tips Advancing diabetic wound care: The role of copper containing hydrogels: Heliyon