GHK Cu is a copper peptide known for supporting skin repair, collagen production, and overall tissue healing., Traditionally, its taken as an injection but that can come with irritation, bruising, or Skin Health & Renewal Programs beyondMD GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? Copper Peptide Serum Aromafem GHK Cu Copper Peptide Supplement, Promotes Skin Repair, Reduces Wrinkles eBay