GHK CU Research Peptide Alpha Carbon Labs Does GHK Cu actually mess with other peptides or is it more about how things are formulated? From what I've been learning, most of the issues people talk about come down to GHK Cu (50 MG) Sigma Compounds 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