GHK Cu: The Midlife Peptide Your Skin Has Been Missing (and Why It's Not Just About Wrinkles) Relished Food Holistic Nutrition GHKCu Copper Peptide Therapy Skin & Healing Regeneration 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 Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum