A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend 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 Frontiers Morning vs. evening growth hormone injections and their impact on sleep wake patterns and daytime alertness Copper peptides explained what are the differences between copper peptides and GHK CU peptides? What they actually do for the skin in terms of repair and collagen, and what you can and cant mix