The RHA Collection of hyaluronic acid fillers are the only FDA-approved hyaluronic acid fillers for dynamic wrinkles and folds. Like other HA dermal fillers, RHA is made from hyaluronic acid—but RHA is different, because it’s made differently. RHA uses a gentle manufacturing process. This process helps preserve the natural structure of the HA, helping it mimic the natural HA found in your skin. RHA is the latest advancement in HA filler technology, purposely designed to perform in the most dynamic areas of the face without looking stiff or unnatural.