GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? 2% GHK CU Copper Peptide Serum for Hair Growth and Scalp Care Seraphime One of my favorite peptides is GHK Cu. It has made such a dramatic impact on my skin in just one cycle I've been shocked! It supports collagen, healing, and overall skin Glow from within with GHK Cu Copper Peptide , This powerhouse peptide supports collagen production, skin repair, and hair follicle health, helping improve skin firmness, radiance, and support Hair Growth Serum Intense with Copper Peptide GHK Cu AHK Cu Copper Peptide Hair Growth Study (2007) Plain Language Summary Hairgenetix