Ghk Cu Intra Nasal Spray 50 mg 0.34 oz. 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 Copper Nasal Spray GHK CU (Copper Peptide Serum) NovaNAD+ Revitalize your skin with the ultimate rejuvenation ally! GHK Cu Nasal Spray by Xenogenix delivers powerful copper peptide goodness to boost collagen, smooth fine lines & give you that youthful glow.