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 Copper Peptide Serum 1% Black Tie Health GHK Cu Peptide Foundry Premium Research Peptides GHK Cu Copper Peptide: The Ultimate Peptide For Longevity
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