The Science and Benefits of GHK Cu Peptide: Skincare, Hair Growth, and Beyond What Makes GHK Cu Copper Peptides Blue? GHK CU Color Vitali Skincare 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 The Pretty Purple Peptide with Powerful Benefits That gorgeous blue purple solution isn't just for looksit's GHK Cu, one of the most studied peptides in regenerative medicine. Here's what it can do for