What Is GHK Cu? Peptide Research By Bluewell Peptides 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 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 Copper Peptide GHK Cu Skin Serum Nubeean Noosa GHK Cu Topical Sky Blue Cream & Royal Blue Serum Bundle Aseir Custom copper peptide ghk cu TikTok Shop