Copper Peptide Regenerating Serum for Glowing Skin and Hair Copper Peptide Regenerating Serum for Glowing Skin and Hair GHK CU Peptide for Skin Rejuvenation Wittmer Rejuvenation Clinic NEW GHK Cu , Now Available at Carrington Medical, Healthier Skin. Thicker Hair. Real Science. , Were excited to offer GHK Cu (copper peptide) in our treatments the latest in regenerative GHK CU Peptide for Skin Rejuvenation Wittmer Rejuvenation Clinic GHK Cu Before and After: See Fine Lines and Wrinkles Fade Fast