Matrixyl is a trademarked peptide composition developed by Sederma in France. This highly-effective composition has been shown to reduce the look of static & dynamic wrinkles. This formula contains two generations of Matrixyl Matrixyl 3000 & Matrixyl Synthe'6 at a combined concentration of 10% by weight in a specialized Hyaluronic Acid delivery system. The peptide in Matrixyl 3000 is palmitoyl tetrapeptide-7 & the peptide in Matrixyl Synthe'6 is palmitoyl tripeptide-38. (Matrixyl is a trademark of Sederma. Neither DECIEM nor The Ordinary is affiliated with Sederma.) Note: We are deeply grateful to our devoted customers for loving us & our products so much. Our lab has & continues to devote countless hours to share the newest innovations with our broader world. The Ordinary now offers a wide range of products under the Vitamin C Peptide & Direct Acid categories & to help our ever-growing loving family of users build functional & effective routines incorporating these products we have developed an introductory guideline into the br&. Previously we did not have a contraindication listed for the use of direct acids/ Vitamin C with any of our peptides. However we now have a huge arsenal of these products & some of the formulations are more susceptible to hydrolysis with certain types of Vitamin C or acids. Instead of developing a complex guide listing the compatibility of each of our peptides with each acid & Vitamin C we have adapted the following approach to maximize efficacy for the maximum number of people: It is best to not use Peptides in the same routine as the following products: Direct acids LAA (L-Ascorbic Acid) & ELAA (Ethylated Ascorbic Acid). In addition we would recommend avoiding the use of products containing copper peptides in the same routine as strong antioxidants as well as direct acids/LAA/ELAA.