GHK Cu Copper Peptide Powder, CAS 49557 75 7, Purity Jamaica Ubuy 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 Understanding Peptides: BPC 157, GHK Cu & Beyond Meeting Point Health superPeptide 1% GHK Copper Peptide Serum Pure & Cimple Amazon.com: Skin Perfection Copper Peptide Serum GHK CU 1% for Face & Hair Copper Peptides for Skin, Hair, & Scalp 1% Blue Liquid for Face, Neck, Body, Scalp Multi Use Serum Booster with Peptide Therapy in Brandon & Lakeland, FL BPC 157, TB 500 & GHK Cu