The RHA Collection is a line of hyaluronic acid fillers designed to provide an exceptionally natural appearance, whether your face is at rest or in motion. RHA fillers are the only FDA-approved formulas to treat the dynamic facial wrinkles and folds that develop in response to natural facial expressions.
Hyaluronic acid (HA) is a substance naturally found in our body that holds up to 1,000 times its weight in water. When it’s used in dermal filler, it can make skin look more hydrated and plump, fill in wrinkles and folds, and improve facial contours.
RHA, or “Resilient Hyaluronic Acid,” was developed to more closely mimic natural hyaluronic acid than traditional fillers. RHA fillers feature longer chains of hyaluronic acid with less crosslinking than other filler formulas, so it’s more similar to the natural HA found in your body.
Even with facial movement, these longer, more resilient chains can appear more natural and less “stiff” than those from fillers that contain shorter hyaluronic acid chains.
Called Teosyal in Europe, the RHA Collection is made by Swiss company TEOXANE and distributed in the U.S. by Revance Therapeutics. There are five products in the full collection, though so far, only RHA 2, RHA 3, RHA 4, and RHA Redensity have been FDA approved in the U.S.
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Presently, there are four RHA fillers available in the United States, each with different degrees of crosslinking.
As with any facial filler treatment, being treated with products in the RHA Collection of fillers typically takes between 30 minutes and an hour.
You’ll see your initial results immediately after your treatment.
Most people have no downtime, though swelling and bruising post-injection is normal. It may take up to two weeks for all of your swelling to go down so you can see your final results.
How long RHA Collection filler results last will vary from person to person. Typically, hyaluronic acid filler’s longevity depends on where the filler is placed (facial areas that move more often tend to “burn through” filler faster), your metabolism, and how your body responds.
However, RHA fillers are some of the longest-lasting hyaluronic acid fillers available in the U.S.: results last up to 15 months.
Nearly all other hyaluronic acid fillers last up to a year, except for Juvéderm Voluma, which lasts up to two years.
Generally, treatment with HA fillers is very safe—especially in experienced hands.
The most common side effects to experience after treatment with RHA fillers are bruising and swelling at the injection site. You can help diminish them by avoiding alcohol and blood-thinning medications like aspirin and fish oil in the days leading up to your dermal filler appointment.
Related: Injectable Bruises? Been There. Here’s How to Handle Them Without Hiding Out
Nodules, or little bumps, are also common and can usually be resolved with massage. Ask your provider during your appointment about their stance on massaging filler.
The biggest potential complication from any filler is inadvertent injection into a blood vessel, which can cause tissue death, vision loss (particularly a risk with nonsurgical nose jobs), and even stroke if it’s not dissolved quickly.
Related: Vascular Occlusion Is the Scary Filler Complication No One Talks About
In addition to where the filler is being injected, the factor that most increases the potential for risk is an unskilled injector. That’s why it is criticalthat you seek out treatment from a trained, experienced, and licensed provider with a thorough comprehension of facial anatomy, such as a board-certifieddermatologist or plastic surgeon, or a nurse or physician’s assistant who specializes in injectables.
Remember that physicians, physician’s assistants, and nurses are the only providers who are licensed to administer filler in the United States, so steer clear of estheticians and salon owners offering injectables.
Other HA filler brands include Restylane, Juvéderm, and Belotero. Like the RHA Collection, these brands all offer multiple hyaluronic acid fillers with varying degrees of viscosity to address different aesthetic concerns.
Just keep in mind that they probably won't be as long-lasting as RHA fillers, which may also provide a more natural look as your face moves.
There are also fillers for your face that use ingredients other than hyaluronic acid, including biostimulatory fillers like Sculptra Aesthetic (made from poly-L-lactic acid) and Bellafill (bovine collagen and polymethyl methacrylate microspheres), both of which trigger your body to naturally produce collagen for long-lasting firming effects.
Another filler, Radiesse, uses calcium hydroxylapatite to help plump the skin. However, these treatments can’t be dissolved or reversed like hyaluronic acid fillers, which is important to remember if the ability to change your mind (or correct an unwanted result) is important to you.
If you’re looking for a more permanent facial rejuvenation solution than dermal fillers can offer, you could be a candidate for facial fat grafting, using your own fat.
Updated February 21, 2024