Reducing Redness & Inflammation with GHK Cu Copper Peptides Vitali Skincare These are the two most common acne cures as far as intense medication. That goes into your bloodstream, so here's my honest opinion on both peptides and Accutane. Why You Shouldnt Mix GHK Cu with AHA, BHA, or Retinol, If youre using a GHK Cu (Copper Peptide) in your skincare routine, layering it with strong actives like AHA, BHA, or retinol may actually Using GHK CU for Acne and Scarring Treatment These are the two most common acne cures as far as intense medication. That goes into your bloodstream, so here's my honest opinion on both peptides and Accutane.