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 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 Purity Peptide GHK Cu research peptides are produced with strict quality standards and verified purity for dependable research performance. Shop research peptides at www.puritypep.com #PurityPeptide #GHKCu #ResearchPeptides #LabTested #PeptideScience Ghkcu Peptide Cream Vs Injectable TikTok