is a derivative of sodium hyaluronate produced through an acetylation reaction, which introduces acetyl groups into the sodium hyaluronate molecule. This modification imparts both hydrophilic and lipophilic properties, enhancing its biological activity and moisturizing performance. It offers multiple benefits including dual hydration, repair of the stratum corneum barrier, and improved skin elasticity, thereby optimizing the performance of sodium hyaluronate and making it widely used in personal care products.