You are wasting your peptides if you are mixing them with GHK cu., Lets not even talk about all the the blend pens being sold., Even Peptide companies are selling GHK cu Blends. They damage the other GHK Cu Peptide Benefits for Skin and Hair LIVV Natural 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 Buy GHK Cu Exceptional 99%+ Purity Third Party COA Included