How Does XERF Work? Radiofrequency and Collagen Remodeling
Oct 02, 2026
How Does XERF Work? Radiofrequency and Collagen Remodeling
XERF uses non-invasive monopolar radiofrequency to deliver high frequency electrical energy through tissue, where resistance converts that energy into controlled heat.
The objective is not to burn the skin. It is to create a controlled thermal response within targeted tissues that can produce immediate changes in some collagen structures followed by a gradual biological remodeling response.
XERF uses two frequencies, 6.78 MHz and 2 MHz, to create different patterns of thermal distribution.
What is radiofrequency?
Medical radiofrequency is not a laser.
Laser devices use light at specific wavelengths, while RF devices use alternating high frequency electrical current.
As the current passes through tissue and encounters impedance, electrical energy is converted into heat through resistive or Joule heating.
This controlled heating forms the basis of RF tissue tightening technologies.
What does monopolar RF mean?
With monopolar RF, electrical current travels from the active treatment electrode through the patient's tissues toward a return electrode positioned elsewhere on the body.
This differs from bipolar RF, where the active and return electrodes are generally positioned close to each other within the treatment handpiece.
The electrical configuration influences how energy is distributed through tissue.
Why does XERF use two frequencies?
Different RF frequencies interact differently with tissue.
Computational and preclinical evidence suggests that the lower 2 MHz frequency can create broader and deeper thermal distribution, while 6.78 MHz produces more localized heating within relatively more superficial and intermediate tissues and fibrous structures.
XERF uses the frequencies sequentially during treatment.
However, it would be an oversimplification to claim that each frequency always reaches one exact depth in every patient.
Thermal distribution is influenced by tissue thickness, fat, fibrous anatomy and treatment parameters.
What happens to collagen when tissue is heated?
Collagen is an important structural protein within skin and connective tissue.
When an appropriate therapeutic thermal range is reached, heat can alter the molecular structure of some collagen fibers and produce initial thermal contraction.
A subsequent healing and remodeling response can then influence the extracellular matrix over time.
This helps explain why some thermal treatment effects may be noticed early while other changes develop gradually over the following weeks and months.
Does XERF stimulate new collagen?
Histological evidence supports collagen remodeling following dual frequency monopolar RF.
A recent animal study demonstrated changes in collagen and elastin across the dermis and fibrous septa following treatment, with remodeling changes becoming more apparent at later assessment points.
These findings support the proposed biological mechanism.
They do not, however, allow clinicians to state exactly how much new collagen an individual patient will produce or guarantee a fixed percentage of clinical improvement.
What happens to elastin?
Recent histological research also demonstrated changes involving elastic fibers after dual frequency RF treatment.
Both collagen and elastin contribute to the mechanical properties of skin and connective tissue, so remodeling of these structures may contribute to gradual changes in tissue firmness.
Larger human studies are still needed to determine how these histological findings translate into long term clinical tightening.
Does XERF reach deeper tissue layers?
Computational and preclinical studies suggest that 2 MHz RF can produce broader and deeper thermal distribution than 6.78 MHz.
However, there is an important distinction between demonstrating heat distribution in computational or animal models and proving treatment of a specific anatomical structure in living human patients.
The recent prospective clinical study itself noted that direct tissue level confirmation involving specific deep structures such as the SMAS was not assessed in its human participants.
Claims that XERF definitively "tightens the SMAS" in every patient should therefore be interpreted cautiously.
Does heating fat mean destroying fat?
No.
A recent histological study found that 2 MHz produced deeper thermal effects within adipose tissue, but there was no evidence of adipocyte apoptosis in the studied animal model.
Thermal exposure of subcutaneous tissue is therefore not equivalent to proven fat cell destruction.
How is the skin surface protected?
RF systems must balance tissue heating with protection of the epidermis.
XERF incorporates Integrated Cryogen Delivery to cool the skin surface during treatment.
The system also monitors treatment tip surface temperature and incorporates energy control features.
These technologies can support thermal control, but they do not eliminate the importance of appropriate settings and technique.
What do Shallow, Middle and Deep settings mean?
XERF provides settings designed to modify energy delivery according to the intended tissue target.
The recent multicenter study used Shallow, Middle and Deep settings according to facial area and treatment objective.
These terms should not be interpreted as three identical anatomical lines in every patient.
Tissue thickness and anatomy vary considerably between facial areas and between individuals.
Why do results develop gradually?
Tissue remodeling is a biological process.
Some collagen structures may respond immediately to controlled heating, but extracellular matrix remodeling and structural reorganization require time.
Clinical studies have reported continued changes when patients were assessed one and three months after treatment.
Does higher energy produce better results?
Not necessarily.
Thermal treatment has a therapeutic window.
Insufficient energy may fail to create the intended tissue effect, while excessive heating can increase the risk of thermal injury or burns.
The objective is therefore appropriate thermal delivery to the target tissues rather than simply using the highest possible energy.
Should the same settings be used across the entire face?
Not necessarily.
Tissue thickness differs between the cheek, jawline, submental area and neck.
Clinical objectives also vary between patients.
Treatment parameters should therefore be adapted to anatomy and treatment goals rather than applying one identical protocol indiscriminately.
What do human studies show?
A prospective multicenter study involving 39 participants reported short term improvement in facial laxity following two dual frequency RF sessions.
A more recent retrospective study involving 16 women reported objective and subjective improvements following a single XERF treatment through three months of follow up.
These findings are encouraging, but the total number of patients studied remains limited.
Larger independent and longer term clinical studies are still needed.
The bottom line
XERF works by converting monopolar RF energy into controlled heat within tissue.
The combination of 6.78 MHz and 2 MHz provides different patterns of thermal distribution, and preclinical evidence supports collagen and elastin remodeling following dual frequency treatment.
Early human studies also suggest improvement in facial laxity in selected patients.
Understanding the mechanism, however, should not lead to exaggerated claims. Current evidence does not establish one exact treatment depth, a fixed amount of new collagen or a guaranteed degree of tightening for every patient.
Frequently asked questions
Is XERF a laser?
No. It uses radiofrequency electrical energy rather than laser light.
Why does XERF use two frequencies?
Research suggests that 6.78 MHz and 2 MHz create different thermal distribution patterns, potentially allowing treatment across different tissue levels.
Does XERF reach subcutaneous fat?
Thermal effects can extend into subcutaneous tissues, but this does not automatically mean fat cells are destroyed.
Does XERF stimulate collagen?
Histological studies support collagen remodeling following dual frequency RF, while human research continues to define the magnitude and durability of the clinical effect.
How Many XERF Sessions Do You Need?
This content is intended for medical education and general patient information. Treatment parameters, energy and tissue targets should be selected by a qualified medical practitioner according to individual anatomy and device instructions.
