Copper tripeptide GHK Cu and Regenerative Aesthetics PRIME Journal Does the use of Glycine Histidine Lysine (GHK) improve with Retin A ( tretinoin)? Retinol Vs Peptides Which Is Better? Science Becomes Her Copper peptides better than tretinoin? #dermreacts #tretinoin #copperpeptide 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