Alternating tretinoin and GHK Cu (copper peptides) nightly maximizes anti aging benefits while minimizing irritation. , Both are potent but DIFFERENT actives. Tretinoin speeds up cell turnover and EllieVate Skin review with prescription strength tretinoin 12 weeks in, and my skin has NEVER looked better! GHK peptides are doing their thing. Alright, I need to give you an updateit's been 12 weeks since I started using GHK Copper peptides better than tretinoin? #dermreacts #tretinoin #copperpeptide GHK Cu: The Peptide That Transforms Skin and Tissue Health Calibrate Hydration