GHK Cu Peptide Therapy Connecticut Skin Rejuvenation Benefits Two Weeks on GHK CU by Rory Uphold The Ladies Room GHK Cu Research Overview Copper Peptide Studies Essential GHK Cu Serum: What It Is, How It Works, and Why It Matters f Bacteriostaticwater.com GHK Cu Facial Serum Empower Pharmacy 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