GHK Cu Copper Peptide: Dosage, Before and After Results, and How It Works Perfect B 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 FDA Unbans 14 Peptides for Legal US Compounding! : r Biohackers How to Ensure the Stability and Efficacy of GHK Cu in Skincare Products? Knowledge Bioway Organic