To ensure the highest standards of quality and transparency, our GHK-Cu 19315 has been independently tested by Janoshik, one of the most respected names in peptide analysis. The Certificate of Analysis (COA) for batch 19315 confirms an exceptional purity of 99.974%, with a total content of 130mg in a 100mg-labelled vial—demonstrating a very high peurity. This certificate applies to both batch 19315 (100mg). We’ve made the COA available directly on this page to give you complete peace of mind regarding the integrity and reliability of our product.