GHK Copper Peptide GHK Cu Tripeptide 1 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 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 am+pm 5% B5+GHK Cu Hydrating Serum NARKO