RHA® Collection is designed to be resilient enough to adapt to your facial movement, which may provide a more natural look at rest and in motion. The RHA® Collection is made with a gentle Swiss manufacturing process. This gentle process helps preserve the natural structure of the hyaluronic acid, allowing it to more closely resemble the natural hyaluronic acid in your skin. RHA is FDA approved to last at least 18 months. Studies have show upto 24 months. There are four formulations in the RHA® Collection, your Aesthetic Injector will help you determine which one is best for your treatment plan.