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 Cosmetics Grade Blue Copper Peptide GHK CU Powder GHK CU Copper Peptide Recovery Peptide Suppstance GHK Cu Copper Peptide 10mg Research Use Only Laboratory Supply UK THE SECRET BEAUTY STORE GHK Cu 50 mg Copper Peptide Research Grade PRG GHK Cu 1gram (Copper Peptide) (1000mg), Color : White, Purity : 100% at Rs 900 in Tiruchirappalli