Hyaluronic Acid (HA) fillers are the most popular fillers as they are reversible, safe and they make natural-looking results. Hyaluronic acid (HA) is our skin’s natural moisturizer; you might have come across it in your day and night creams. In your body, hyaluronic acid (HA) fills the spaces between cells, protecting them by retaining water, and serving as a cushion. HA can hold up to 1,000 times its own weight in water, maintaining the smoothness (moisturizing effect) and plumpness (volumizing effect) of our skin. HA fillers are typically soft and gel-like. The results are temporary, lasting 6 to 12 months or longer before the body gradually and naturally absorbs the particles.