Breaking: more people are starting to explore copper peptides over retinol, Not because retinol is bad, but because people are beginning to understand how different ingredients actually work., 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 ION BLUE's Video on X Longevity: Functional Medicine for Optimal Health and Wellness Ozark Have you heard of GHK Cu the copper peptide your body is already making? GHK Cu (Glycyl L Histidyl L Lysine Copper) is a naturally occurring tripeptide found in human plasma, saliva, and urine.