RHA fillers are a form of dermal filler that are created from hyaluronic acid that has been cross-linked for the absolute best and natural results. They are meant to replicate the natural HA that is already present in your skin to create a natural and volumized look.
That said, they are often used on patients to give a natural enhancement, to last for a long time, and to provide a dynamic effect, particularly in parts of the face that are in continual motion.