One of the questions we often receive about our products is: Why is the GHK Cu Repairing Serum stored in two part packaging? GHK Cu is an unstable ingredient that can slowly lose its effectiveness A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu: The Elegant Copper Peptide for Skin and Scalp Renewal Renew Vitality GHK CU aka the beauty peptide. I've got the reconstitute and dose chart at the end for reference. Where I purchase mine from Elite Peptides Australia Discount code WISHY10 (because who doesn't love