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 200mg Peptides World GHK Cu 100mg BleauGenics Research Peptides The Copper Topical (GHK Cu BPC 157) Simon's Compounding
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