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 BPC 157 TB 500 Blend (GLOW Mix) Lumin Peptides Buy GHK Cu Peptide 99%+ Purity GHK Cu for Research GHK Cu Peptide Before and After Results
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