GETTING YOUR SKIN TO WORK HARDER Profhilo® is the first injectable hyaluronic acid (HA) based product for treating skin laxity. HA is hydrophilic, meaning it draws and holds water from your body, so Profhilo® acts as a hydrator rather than a filler. This makes it fantastic for those with tired, dull-looking skin, transforming it into firm, luminous skin. This effect takes place within 3-5 days of treatment.