Mistakes Mixing GHK CU Peptides with Hyaluronic Acid Topical GHK cu with Hyaluronic acid : r DIYaesthetics 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 Skin Perfection Ghk Cu Copper Peptide Powder 99.7% Djibouti Ubuy Amazon.com: GHK Cu Copper Peptide Powder 99.7%+ Pure Cosmetic Grade Ingredient for DIY Serums, Creams & Scalp Tonics Supports Collagen & Fuller Hair (1g) : Beauty & Personal Care GHK Copper Peptide GHK Cu Tripeptide 1