GHK Cu Peptides Level Up Your Look Bundle Aseir Custom Copper Peptides: GHK Cu is your skin's built in botox Fatskn GHK Cu Injectable Team Wellcore BLUE PEPTIDE SPRAY Young Goose A GHK Cu face serum appears blue because the active ingredient, GHK Cu (copper peptide), is naturally a blue colored powder, meaning its inherent color transfers to the serum when mixed in; this blue hue