INSTITUT ESTHEDERM INTENSIVE HYALURONIC SERUM 30ML. Hyaluronic acid is a molecule that is naturally present in the skin and it is the skin’s water reserve. Intensive Hyaluronic Serum is made from a patented complex of three different forms of hyaluronic acid that penetrate the deep layers of the epidermis in order to redensify tissue by filling it with water. KEY BENEFITS Instantly plumps the skin Fills in wrinkles and fine lines Rehydrates the surface of the skin