GHK Cu Hair & Scalp Serum 2400mg 4% Less Shedding Neurogan Neurogan Health Pptido de cobre GHK GHK Cu Tripptido 1 Wrinkle Twinkler: DIY Peptide Serum 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 GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack?