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, GHK Cu (100 MG) Sigma Compounds GLOW Nasal Spray Polar Peptides GHK Cu + NAC Copper Peptide Nasal Spray , GHK Cu + NAC Copper Peptide Nasal Spray is designed to support cellular regeneration and overall wellness. This nasal spray delivers GHK Cu directly into Ghk Cu Intra Nasal Spray 50 mg 0.34 oz. GHK CU Peptide Nasal Spray Muse Beauty