Hyaluronic acid (HA) is a naturally occurring substance that is already found in your body but as you get older less is present. HA helps keep skin plump, hydrated and can add supportive volume to the face. HA fillers are typically soft and come in a gel-like consistency. The results are temporary, lasting 9 to 12 months or longer before the body gradually and naturally absorbs the HA particles. Hyaluronic acid fillers can produce results that help to add volume to the skin to give a more youthful and soft appearance when done correctly.