Your skin?s daily dose of strength. Vichy Min?ral 89 Hyaluronic Acid Booster is designed to rehydrate and protect the delicate skin barrier. A hydrating serum enriched with Vichy?s highest concentration of 89% Vichy Thermal Mineralizing Water with Hyaluronic Acid, the gel serum plumps skin and strengthens the skin barrier to protect from the impact of daily aggressors such as pollution. The perfect first step in every skin care routine for up to 24-hour hydration.