Copper Peptide Serum for Dull & Mature Skin VALNCIA GHK Cu Copper Peptide Serum NCell GHK Cu Copper Peptide Serum 1% Black Tie Health My steps: NIOD CAIS: Apply a few drops directly to a clean, dry face. The Ordinary Hyaluronic Acid: Pat gently onto the skin once the CAIS has absorbed. NIOD Re:Pigment: Layer this Copper Peptide Serum with 1% GHK Cu peptide, Argireline and Matrixyl 3000 NIOD Skincare New! COPPER AMINO ISOLATE SERUM 3 1:1 CAIS Review and How to Use