Index
Volume loss and elasticity decline are distinct problems that require distinct solutions.
HA fillers restore volume and contour immediately; biostimulators stimulate the body’s own collagen production over time.
Choosing between them depends on what the skin has lost, how quickly correction is needed, and how long the result needs to last.
At 4Ever Cheongdam Clinic, Dr. Younghan Seo outlines the clinical differences and when each approach is appropriate.
Key Takeaways
HA fillers provide immediate volumetric correction and are fully reversible with hyaluronidase; biostimulators produce gradual, longer-lasting collagen regeneration.
Teoxane RHA series mimics the natural structure of hyaluronic acid most closely, allowing dynamic movement with facial expression.
Ellansé (PCL-based) is a hybrid biostimulator delivering both immediate volume and sustained collagen induction over one to three years depending on formulation.
Dr. Seo represents Korea as a Teoxane Country Expert and presented at Teoxane Academy Asia in Bangkok.
For patients with both volume loss and laxity, combining HA filler or Ellansé with Thermage FLX addresses structural and surface concerns simultaneously.
HA Filler: Immediate Correction and Precise Contouring
Hyaluronic acid (HA) is a naturally occurring substance in the body, making HA-based fillers biocompatible with a well-established safety profile.
Injected directly into the target area, HA filler restores lost volume and reinforces the dermis immediately following treatment.
Longevity varies by product rheology: softer formulations last six to twelve months; firmer structural fillers can maintain their effect for one to two years or longer.
All HA fillers are reversible with hyaluronidase, which makes them appropriate for patients who want adjustable or reversible correction.
HA filler is the preferred option when immediate, precise contouring is the clinical objective.
Teoxane RHA Series and Juvederm
Dr. Seo works with the Teoxane RHA series and the full Juvederm lineup.
The Teoxane RHA series is engineered using Swiss patented RHA (Resilient Hyaluronic Acid) technology, which most closely replicates the natural HA polymer structure found in skin.
This allows the filler to move dynamically with facial expression rather than remaining static, producing more natural-looking results in areas of high movement.
All Teoxane products contain lidocaine, reducing procedural discomfort.
The trade-off is technical complexity: Teoxane RHA is more technique-sensitive than standard HA fillers and requires significant injector experience to handle correctly.
Dr. Seo holds the designation of Teoxane Country Expert, a title awarded to physicians with demonstrable expertise in clinical application, academic contribution, and practitioner education for the Teoxane product line.
He attended Teoxane Academy Day Asia in Bangkok as a Korean representative. When considering Teoxane RHA treatment, confirming this designation is a relevant due-diligence step.
Biostimulator: Gradual Collagen Induction and Long-Term Structural Support
Biostimulators do not add volume directly. They trigger the body’s collagen synthesis pathway, gradually restoring the structural density lost through aging.
The result develops over weeks to months and typically lasts eighteen months to two years on average, outlasting most HA fillers.
The tradeoff is timing: patients who need immediate correction are not ideal candidates for biostimulator monotherapy.
Those willing to accept a gradual onset in exchange for a more durable and natural-appearing result are well suited.
Ellansé: PCL-Based Hybrid Biostimulator
Ellansé is a polycaprolactone (PCL) biostimulator that provides both immediate volumetric effect and progressive collagen induction as the PCL carrier resorbs.
This dual mechanism makes it functionally distinct from PLLA (Sculptra) or PDLLA (Juvelook) biostimulators, which provide minimal immediate volume.
Ellansé is available in two formulations approved in Korea:
Ellansé S targets dermal density and surface laxity.
It is suited to patients with thin or low-density skin presenting with fine lines and early structural loss.
Duration is approximately one year, making it a practical entry point for biostimulator treatment.
Ellansé M uses a longer PCL chain structure, extending both the collagen induction period and the duration of effect to two to three years from a single session.
It is preferred when sustained structural support is the primary objective.
About 4Ever Cheongdam Clinic
4Ever Cheongdam Clinic is a dermatology practice in Cheongdam-dong, Seoul, South Korea.
Dr. Younghan Seo holds Teoxane Country Expert designation and KOL status with Sinclair Pharmaceuticals for Ellansé, and presents regularly at Korean and international academic aesthetic medicine conferences.
Consultations assess volume distribution, skin density, and structural laxity before any injectable protocol is finalized.
Frequently Asked Questions
Q. How long do HA filler and Ellansé results last, and how often should treatment be repeated?
A. Teoxane RHA and Juvederm fillers last six months to two years depending on the product and treatment area. Ellansé S lasts approximately one year; Ellansé M lasts two to three years from a single session. Maintenance timing is assessed individually at follow-up based on how the skin has responded and whether collagen induction is progressing as expected.
Q. Are HA fillers and biostimulators safe, and what are the main risks?
A. Both carry well-established safety profiles when administered by a trained physician. Key risks include bruising, swelling, asymmetry, and in rare cases vascular occlusion. HA fillers are reversible with hyaluronidase; Ellansé is not. Patients with active skin infections, certain autoimmune conditions, or a history of adverse filler reactions require careful pre-treatment assessment.
Q. What does a filler or biostimulator treatment at 4Ever Cheongdam Clinic typically cost?
A. Pricing depends on product selection, volume required, and treatment area. Teoxane RHA and Ellansé are premium-category injectables priced accordingly. Individualized pricing is provided following a structural skin assessment at consultation. Contact the clinic directly for a quote.
Q. Who is the ideal candidate for Ellansé versus HA filler?
A. HA filler suits patients seeking immediate, precise volumetric correction in specific areas such as the nasolabial fold, lips, or tear trough. Ellansé is preferred for patients with diffuse collagen loss, generalized volume deflation, or skin that has lost structural density across a broad area, particularly when a longer-lasting result is the priority and immediate correction is not required.
Q. How does Teoxane RHA differ from standard HA fillers in terms of injection technique and patient experience?
A. Standard HA fillers use cross-linked hyaluronic acid that behaves relatively uniformly under injection pressure. Teoxane RHA uses a resilient polymer structure that moves with facial expression, which produces more natural dynamic results but requires the injector to account for tissue movement during placement. It is more technique-sensitive, which is why confirming Teoxane Country Expert designation in the treating physician is a clinically relevant step before proceeding.
Ready to discuss a treatment plan tailored to your skin?
4ever Cheongdam Clinic offers one-to-one consultations with Dr. Younghan Seo.