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, Hair Growth Serum Intense with Copper Peptide GHK Cu GHK Cu Peptide Benefits for Skin and Hair LIVV Natural GHK Cu Revitalizing Serum 16oz 1 Gallon Private Label Derma ProLab Melatonin Hair Growth Serum GHK cu Stem Cells Scalp Hair Growth Serum STEMBOTANY Thrive Copper Peptide Serum Skin Barrier Support & Hydration 29ml