The ISOI Moisture Doctor Longevity Moisturizing Toner is designed to enhance skin barrier strength, boost hydration, and calm the skin using natural plant extracts like tea tree ceramides and ingredients such as pentahyaluronic acid. It is a water-type toner that has been dermatologically tested to provide comprehensive care by addressing the lipid structure of the skin barrier and soothing sensitive skin with components like Houttuynia Cordata and Centella Asiatica.