Home First Choice Credit Union THE BEST 10 Banks & Credit Unions in WEST PALM BEACH, FL Updated 2026 Hours Yelp 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 Peptide GHK CU Cream Concierge MD Whitening GHK CU Copper Peptide Serum for All Skin Types 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