Ghk cu is honestly amazing for firmer, tighter, more lifted skin!! As we age, our natural copper peptide levels drop, which slows down collagen + elastin production (aka the proteins that keep your GHK CU Copper Peptide, Face Serum, 1 oz (30 ml) GHK Cu (Copper Peptide) is a naturally occurring peptide in the body that binds with copper to support cell repair and renewal. As we age, our levels decrease and thats where supplementation or In Vitro and in Vivo Studies of pH Sensitive GHK Cu Incorporated Polyaspartic and Polyacrylic Acid Superabsorbent Polymer ACS Omega