Not all copper peptide serums are created equal And this is where a lot of people get confused. You'll see copper peptides on the label and expect amazing results but the 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 7% GHK CU ACCELERANT Platinum Skin Care GHK CU VIBRANCY MICRONEEDLING KIT LUX LAB