Best Copper Peptide Serum The top 4 options of 2026 Blue Copper Peptide Ghk Cu 99% Care Ghk Cu 50mg 100mg vials Cosmetic Ingredient GHK GHK CU and blue copper Thoughts on the colour of this GHK CU 50mg (still in powder form) : r PeptidePathways Glow Peptide Protocol GHK Cu, BPC 157, TB 500 Neurogan Health 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