NL GHK Cu (TETRAPEPTIDE + CU) Synthagen Synthagen PL GHK Cu Peptides Serum TryDeloura 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 NEW GHK cu A refined addition to your skincare routine. Now part of the DoNotAge range, this formula has been developed to support the overall appearance and quality of the skin Why You Shouldn't Mix GHK Cu with AHA, BHA, or Retinol If you're using a GHK Cu (Copper Peptide) in your skincare routine, layering it with strong actives like AHA, BHA, or retinol may