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 A Dermatologist's Take on the Copper Peptide (GHK Cu) Trend GHK Cu Copper Peptide Serum 1% Black Tie Health Copper Peptides for Hair Serum GHK Cu for Hair PLU Labs GHK CU 100MG MOB Biotech
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