Hyaluronic acid (HA), naturally occurring in the skin, is a macromolecule able to retain up to 1,000 times its weight in water, which makes it the main moisturizing agent in the epidermis. It forms an imperceptible film on the skin which also prevents moisture loss. Biotechnology allows to obtain smaller hyaluronic acid molecules of lower molecular weight, able to penetrate in the epidermis to restore moisture and substance to the skin. Hyaluronic acid is one of the main ingredients in Revitalift Filler and Hydra genius.