GHK Cu Copper Peptide Powder, CAS 49557 75 7, Purity Vietnam Ubuy 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 7% GHK CU ACCELERANT Platinum Skin Care 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