Not all Copper Peptides are created equal If you've tried copper peptides before and saw no change, here is why: Concentration and Stability. Most serums use a diluted solution that barely scratches 99% GHK Cu Peptide Powder Cosmetic Grade Copper Tripeptide 1 (GHK Cu) Blue Copper Peptide GHK Copper Lyophilized Pure Powder GHK Cu (Copper) For Sale (50mg) Core Peptides GHK CU for Sale Tripeptide 1 3rd Party Tested US Made GHK Cu Topical Cream GHK CU 50mg Vial Copper Peptide Pure Bio Labs