Copper Peptides Serum with Hyaluronic Acid GHK Cu Peptide Serum 30ml for Face Skin Tightening, Repairing & Collagen Boosting Anti Aging Serum Shopee Philippines Copper Peptide (GHK Cu) Serum The biological signal for full body skin tightening. If you want to visibly improve skin density, elasticity, and firmness, you need the right biological messenger. Enter GHK Cu (Copper Peptide). This powerful molecule 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 Topical Serum 30ml Azur Skin 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