GHK Cu (75mg) Alpha BioMed Topical GHK cu with Hyaluronic acid : r DIYaesthetics Multi Peptide + Copper Peptides 1% for Wrinkles and Skin Elasticity AHK Cu (Copper Tripeptide 3) Ingredient Guide Nubeean Noosa 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 Thoughts on the colour of this GHK CU 50mg (still in powder form) : r PeptidePathways