Smooth. Hydrated. Radiant. Our GHK Cu Copper Peptide Face Cream adds the perfect finishing touch to your glow ritual lightweight hydration that supports your skin's natural radiance. Save 20% with GHK Estriol Tretinoin Niacinamide Regen Doctors What is GHK Cu? GHK Cu is a naturally occurring copper peptide composed of three amino acids bound to copper. It functions as a signaling molecule in the skin, helping to support repair processes, LUMINATE is a collagen stimulating peptide serum that combines three fast acting peptides (GHK Cu, Argireline, and Leuphasyl) to help reduce the appearance of wrinkles and promote firmer, healthier