GHK Cu is a naturally occurring copper binding peptide that plays a major role in tissue repair and remodeling, with a strong focus in research on skin and hair biology. It works by signaling GHK CU Revive Amino What Makes GHK Cu Copper Peptides Blue? GHK CU Color Vitali Skincare GHK Cu Peptide (50mg) Advanced Skin Rejuvenation & Healing Support Blue Copper Ghk cu Peptide Manufacturers Suppliers Factory Salispharm 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