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 Nasal HyTydes KPV GHK Cu (10 50 MG) Sigma Compounds Nasal Spray GHK CU Splendor Beauty Emporium MELAO 2 PACKS GHK CU Copper Peptide Hair Growth Essence Spray Activates Hair Follicles, Promotes Hair Growth, Strengthens Hair Roots, and Prevents Hair Loss; Suitable for Both Men and Women 50ml*2 Best