Retinoids vs Peptides (Matrixyl CP): what to pick + how to pair, Effectiveness: Retinoids (retinol tretinoin) have the strongest clinical data for photoaging (wrinkles, texture, tone). Peptides GHK Cu Peptide Rescues Aging Cognition but Splits Molecular Pathways in the Brain News Rapamycin Longevity News Copper peptides better than tretinoin? #dermreacts #tretinoin #copperpeptide Collagen Trois: Tretinoin + Copper + Estriol Trio UluRx 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 Collagen Trois: Tretinoin + Copper + Estriol Trio UluRx