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 GHK Cu (Copper Peptide), Your skins secret weapon for repair, regeneration, and glow , Meet GHK Cu (Copper Peptide) one of the most powerful peptides in aesthetics and wellness., Stimulates Neurogan Health, GHK Cu Copper Peptide, Hair & Scalp Serum PSA] Albeit rare Copper peptide "uglies" are real and scary. Case report and looking for advices : r SkincareAddiction One of my patients has shared this picture with me as she felt it was odd that this peptide had this very vivid blue colour, while her other peptides had a clear