This Skin Republic Hyaluronic Acid + Collagen Face Mask is your answer to younger-looking skin! Hyaluronic acid is a natural element of the skin, it's present throughout the body - the magic of it lies in its ability to retain a whole lot of moisture. Just one gram of Hyaluronic acid can hold a whopping six litres of water! All this added moisture means plumper, more youthful looking skin. As the skin has a four week regeneration period it's most effective when used twice a week for the first month and then topped up as required. To ensure skin compatibility, we advisable you test a small area of the skin before use. Use the mask immediately after opening to prevent essence from drying out.