Kiehl's Ultra Pure High-Potency Serum features 1.5% hyaluronic acid in a simple, seven-ingredient formula designed to deeply hydrate and visibly replenish dry skin. This fast-absorbing serum helps boost skin’s moisture, leaving it plump, healthy, and refreshed. For best results, apply 2 to 3 drops morning and night on clean, dry skin, and layer with other serums as desired. Experience concentrated hydration that transforms your skin’s appearance with this pure and effective serum.