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 C2 Peptides GHK CU for Sale Tripeptide 1 3rd Party Tested US Made GHK Copper Peptide GHK Cu Tripeptide 1
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