Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3 Dr. Brenner Labs Organic Copper Peptide Serum Firming & Smoothing Lightly scented with essential oils 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 GHK CU Copper Peptide Face Serum Robyn's Tack Room ROBYN'S TACK ROOM Copper Peptide Duo GHK Cu Anti Aging Serum & Moisturizer 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