GHK CU 50 mg LIVV GHK Cu 100mg "RX required" Let's G Gluta Philippines GHK Cu 100 mg High Purity Copper Peptide Proliven Labs GHK Cu Elive Health & Wellness 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