What is the optimal dosing regimen of GHKCu for topical skincare and woundhealing applications? Best Copper Peptide Serum The top 4 options of 2026 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 GHK Cu 10 g (10% Concentrate, 100,000 ppm) Lrak Technologies 7% GHK Cu Cosmetic Ingredient Accelerant Skin Biology 15 ml Helloskin GHK Cu 1% Triple Peptide Regenerative Serum