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? GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B Ghk Cu Intra Nasal Spray 50 mg 0.34 oz. Westend Medical Supply GHK Cu, commonly known as copper peptides, are found naturally within the human body where they play a vital role in skin repair and maintenance. Copper peptides support optimal skin function by helping