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 Peptide (50mg) Advanced Skin Rejuvenation & Healing Support GHK Cu (Copper) For Sale (50mg) Core Peptides Buy GHK Cu Exceptional 99%+ Purity Third Party COA Included Lets talk GHK Cu , GHK Cu is a naturally occurring copper peptide that supports:, Collagen production, Tissue repair, Skin rejuvenation, Reducing Inflammation , Healthy aging, As levels What Is GHK Cu? How It Works in Research and Quality Signals