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 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 Unlocking the Secrets of GHK Cu: The Revolutionary Peptide for Youthfu GHK Cu Hyaluronic Acid Gel Wells Pharmacy Network