GHK Cu Copper Peptide: The Ultimate Peptide For Longevity PSA] Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r SkincareAddiction Say hello to your skin's new BFF GHK Cu is a powerful peptide that supports collagen production, speeds healing, improves hair growth, and helps fight visible signs of aging. This tiny molecule The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline