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 AHK Cu (Copper Tripeptide 3) Ingredient Guide Nubeean Noosa What is Glutathione? Benefits, Dosages, and Side Effects Buy GHK Cu Blue Copper Peptide CAS 49557 75 7 Cosmetic Use High Purity Cosmetics Grade from Hebei Runxuchen trading Co., LTD ECHEMI Dr. Su Gluta Glow Supplement with L Glutathione & Vitamin C Do you know what this little blue injection is? It's called GHK Cu aka the Glow Peptide I've always believed in peptides for skincare, but honestly I never thought about