GHK CU Copper Peptide, Face Serum, 1 oz (30 ml) Meet the ingredient your skin has been waiting for. GHK Cu, or Copper Tripeptide 1, is one of the most researched anti ageing actives in skincare. It firms. It renews. It supports collagen. And now Biossance Squalane + Copper Peptide Rapid Plumping Serum GHK Cu Peptide Serum 30 ml, Copper Peptide Serum with Hyaluronic Acid for Tightening, Collagen Boosting The Blue Revolution: Why 1% Pure GHK Cu is the New Standard for Mature Pure & Cimple