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 100mg Copper Peptide Helix Research 7% GHK Cu Cosmetic Ingredient Accelerant Skin Biology 15 ml MorNatural GHK Cu as gift : r PeptidePathways
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