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 GHK Cu Peptide Before and After Results The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline 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 Ghkcu Peptide Cream Vs Injectable TikTok Smoking drinking on GHK Cu #reels #peptides #peptide #peptalk #education