GHK Cu A naturally occurring copper peptide known for supporting skin renewal, collagen production, and overall tissue health. Amaira is where science meets longevity focused care. 246 NE 6th Ave Suite 100, Locations and Hours Gold Coast Federal Credit Union 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 GHK Cu Peptide Hormone Replacement Therapy Los Angeles