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 GHK Cu Peptide for Skin & Hair Facial Serum & Scalp Solution Can You Use GHK Cu Peptides with Vitamin C Serum? Expert Guide Not all copper peptide serums are formulated the same Before you buy one, make sure you're actually getting pure GHK Cu at the right concentration not just a diluted blend. We spent GHK Copper Peptide GHK Cu Tripeptide 1