Skin Rejuvenation Bundle 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 Amazon.com: Apothecary Basics Whipped Tallow Balm with Copper Peptide (GHK Cu) & Methylene Blue Skin Texture & Firmness Support 2.5 fl oz : Beauty & Personal Care Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 7% GHK Cu Accelerant