Biossance Squalane + Copper Peptide Rapid Plumping Serum Ghk Cu Intra Nasal Spray 50 mg 0.34 oz. Westend Medical Supply 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 Peptide Labz Copper Peptide 12% GHK CU Serum, Hyaluronic Acid, Anti Aging, 1 fl oz Walmart.com Am+Pm 5% B5+GHK Cu Hydrating Serum