Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare Neurogan Health, copper peptide GHK CU, 120 mcg, 60 tablets iHerb 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, How should a 50 mg vial of GHKCu be reconstituted and how many days will it last when given at 2 mg daily for five days with a twoday break?