Hyaluronic acid makes up the main part of the connective tissue and the fills in the gaps between the individual skin cells. The substance acts as a gel cushion by padding the skin from within. In this way, the skin is given volume and looks much tighter. Hyaluronic acid is a fantastic moisturiser that regulates the skin’s moisture content and is capable of binding one to four thousand times its weight in moisture. The skin remains plump and soft.