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 89030 95 5 GHK Cu Gly His Lys Cu Copper Tripeptide 1; Prezatide copper The GHK Cu Peptide: Benefits, Uses, and Why it's Known as the Regenerative Copper Complex New Biotinylated GHK and Related Copper(II) Complex: Antioxidant and Antiglycant Properties In Vitro against Neurodegenerative Disorders