RHA® - RHA®, or resilient hyaluronic acid, is a type of clear gel injectable filler to increase lost volume, soften deep folds, and reduce wrinkles. Hyaluronic acid (HA) is a naturally occurring chemical that helps keep your skin young and healthy, but over time, your skin loses its natural HA content. RHA® fillers are the first and only FDA-approved dermal filler for correction of dynamic facial wrinkles and folds, including around the cheeks, eyes, and mouth — and because RHA® more closely resembles the hyaluronic acid that naturally exists in your body, it looks perfectly natural, takes longer to break down, and lasts longer than traditional fillers.