Intensive Moisturizing Serum with Organic Blue Tea Infusion and Molecular Hyaluronic Acid. Hyaluronic acid is a naturally occurring substance in the skin that can retain up to 1000 times its weight in water. This serum, rich and silky, contains the optimal concentration of hyaluronic acid at low, medium and high molecular weight to instantly moisturize all layers of the epidermis. Used regularly, it leaves the face compact and rejuvenated, while wrinkles are progressively smoothed.