GHK Cu vs NAD+: Which Longevity Peptide Should You Take or Stack? Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not PSA] Finally, a Dr. explains the mechanism behind the "copper uglies" : r SkincareAddiction