Powerock Pharma GHK CU 50mg Copper Peptide Body Wash Anti Aging, Skin Firming & Hydration Pept Peptide Labz Multi Peptide + Copper Peptides 1% for Wrinkles and Skin Elasticity Thoughts on the colour of this GHK CU 50mg (still in powder form) : r PeptidePathways 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