Skincare Routine: GHK Cu Peptide & Tretinoin There is no definitive answer as to whether retinol vs peptides are better for anti aging. However, there is a lot more research backing retinol as an effective ingredient, while peptides are still 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 Biossance Squalane + Copper Peptide Rapid Plumping Serum Custom Retinol Whitening Serum for Face Booster Skin Care Products Glass Skin GHK CU Serum Blue Copper Peptide Copper Peptides for Skin: What GHK Cu Does and How It Compares to Retinol