GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Let's take a short break from K beauty and revisit an OG skincare ingredient that has decades of research behind it: Copper peptides. One serum that highlights this ingredient beautifully is the @deciem Amazon.com: Copper Peptides Serum for Face Peptides Collagen Renewal & Anti Aging Serum GHK Cu, EGF, Hyaluronic Acid,Collagen Anti Wrinkle, Firming, Moisturizing Korean Skin Care,25mL 0.88 Fl Oz : Beauty & Personal Care We're often asked what the difference is between our two Buffet serums. Do they target different concerns? Is one for more mature skin? Is one better suited to dry skin? As we're Blueprint Haircare Stack: Product Review