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 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 Copper Peptide Research BioStrata Research Skin Perfection Ghk Cu Copper Peptide Powder 99.7% Pure Diy Ghk Powder to Make a Serum for Face Hair Scalp 1g If you're playing with raw GHK Cu, here's the secret that makes it actually work on your skin: mix it with hyaluronic acid. Not microneedling, not fancy devices just a clean