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 Pptido de cobre GHK GHK Cu Tripptido 1 Bellahut COPPER (GHK Cu) With Copper Tripeptide 1 (1% Solution ) GHK Cu Dosage and Protocol: A Medical Provider's Guide to the 30 Day Cycle Perfect B GHK CU Pure Pharma Australia Mistakes Mixing GHK CU Peptides with Hyaluronic Acid