How Hybrid Fillers and the MLS Protocol Redefine Regenerative Aesthetics
Aesthetic medicine today is no longer focused solely on correcting visible imperfections — it aims to reactivate the skin’s natural regenerative potential.
This approach, known as Longevity Aesthetics, combines structural precision with biological renewal.
Among its key techniques are Hybrid Fillers and the Multilayer Stimulation (MLS) Protocol, both reshaping how professionals restore volume, texture, and dermal vitality.
What Is the Multilayer Stimulation (MLS) Protocol in Aesthetic Medicine?
The MLS Protocol is a layered, staged rejuvenation method that stimulates the skin on multiple levels — from subdermal support to superficial hydration.
Each layer is treated with a different category of injectable, ensuring comprehensive and synergistic regeneration.
Core goals of MLS:
- Restore structure and elasticity
- Enhance collagen synthesis
- Improve microcirculation and tone
- Maintain natural expressions and proportions
This multi-step approach follows the principle:
“Activate – Regenerate – Maintain” — supporting both immediate and long-term rejuvenation.
Hybrid Fillers: The Science Behind Structure and Regeneration
Traditional HA fillers primarily address volume and hydration, but hybrid formulations go further — combining cross-linked hyaluronic acid (HA) with biostimulatory ingredients such as calcium hydroxyapatite (CaHA) or polynucleotides (PN).
Mechanism of Action
- HA – provides volume and hydration, supporting the extracellular matrix.
- CaHA / PN – trigger fibroblast proliferation, boost collagen I & III synthesis, and improve skin elasticity.
Clinical Benefits
- Dual action: instant volumization + gradual tissue regeneration
- Long-lasting effect and high patient satisfaction
- Proven safety profile with CE-certified injectables
Hybrid fillers bridge the gap between filler correction and regenerative biostimulation, ensuring visible yet natural results.
Fräya Med Supply Hybrid Filler Portfolio: CE-Certified Products for the MLS Protocol
Hybrid filler (HA + CaHA) providing immediate lift and long-term collagen stimulation.
Ideal for midface volumetry, contour definition, and structural rejuvenation.
PEG-crosslinked HA + CaHA matrix designed for global skin revitalization.
Improves elasticity and density through sustained fibroblast activation.
Renefil Line (Light Plus / Deep Plus / Ultra Plus)
Hybrid filler range combining cross-linked HA with polynucleotides (PN) for wrinkle correction, dermal regeneration, and volumizing.
- Light Plus – fine lines, perioral wrinkles
- Deep Plus – moderate wrinkles, contour correction
- Ultra Plus – volumetric lift, cheeks, chin, jawline
All CE-certified | For professional use only
How the Multilayer Stimulation (MLS) Protocol Works: Step-by-Step Overview
The MLS approach integrates injectables at different dermal depths, aligning their biological effects for maximum synergy.
Recommended Layering and Product Sequence
| Layer | Product Type | Recommended Product | Clinical Goal |
| Deep Dermis / Subdermal Plane | Hybrid Filler (HA + CaHA) | HArmonyCA / Neauvia Stimulate | Structural lift, collagen induction |
| Mid Dermis | Hybrid Filler (HA + PN) | Renefil Deep Plus / Ultra Plus | Fibroblast activation and dermal regeneration |
| Non-Hybrid Biostimulator | Plinest / Newest | Polynucleotide-based regeneration without volumizing effect | |
| Superficial Dermis | Bio-Revitalizer | Fillmed NCTF 135 HA | Hydration, tone, antioxidant protection |
| Mesotherapy Solution | RRS HA Injectable | HA-based cocktail improving elasticity and microcirculation |
All CE-certified | For professional use only | Available at Fräya Med Supply
Timing and Maintenance Protocol
Safety and efficacy depend on staged application — not performing all layers in one session.
Recommended intervals
- Between sessions: every 2–4 weeks (standard: 21 days)
- Between products in the same area: minimum 7–14 days
Procedure sequence
- Deep Layer – hybrid filler (HArmonyCA or Neauvia Stimulate)
- Mid Layer – after ≥7 days: hybrid or PN-based product (Renefil, Plinest, Newest)
- Superficial Layer – after another 1–2 weeks: revitalizer or mesotherapy (Fillmed NCTF 135 HA, RRS HA Injectable)
Maintenance:
3–4 sessions in total, every 3–4 weeks, with maintenance every 4–6 months.
Avoid full MLS in one visit — proper timing ensures optimal fibroblast response and minimizes inflammation.
Clinical Benefits of Hybrid Fillers and MLS Protocols
- Multi-level regeneration and hydration
- Visible yet natural improvement in firmness and tone
- Long-term collagen induction and dermal remodeling
- Minimal downtime
- Clinically validated safety (CE-marked)
Clinical results (after 3 sessions):
+120% hydration | +38% elasticity | +26% dermal density
(Fillmed HEBE2 Study 2019; Allergan Clinical File 2021; BMI Korea Data 2023)
Longevity Aesthetics: The Future of Regenerative Medicine
True longevity aesthetics is not about transformation but sustaining natural function.
Hybrid and biostimulatory injectables enable practitioners to rebuild skin architecture through scientifically supported regeneration — the foundation of timeless, authentic beauty.
“Regeneration is the foundation of timeless aesthetics.”
— Fräya Clinical Insight, 2025
FAQ: Hybrid Fillers & MLS Protocols
What are hybrid fillers used for?
They combine hyaluronic acid with bioactive molecules (CaHA or PN) to provide both volume and long-term collagen stimulation.
How does the MLS protocol improve longevity?
By targeting multiple dermal layers with specific injectables, it supports hydration, firmness, and collagen remodeling from within.
Can hybrid fillers be combined with mesotherapy?
Yes — but never in the same session. Proper sequencing (deep → mid → superficial) ensures safety and optimal results.
What are the best products for the MLS protocol?
HArmonyCA, Neauvia Stimulate, Renefil, Plinest, Fillmed NCTF 135 HA, and RRS HA Injectable are clinically proven and CE-certified.
Explore dermal fillers with Fräya Med Supply
Discover authentic, CE-certified injectables designed for precision and longevity.
References and Clinical Evidence
- Amiri M. et al. (2023). Skin regeneration-related mechanisms of calcium hydroxylapatite (CaHA): a systematic review. Frontiers in Medicine, 10:1195934.
https://www.frontiersin.org/journals/medicine/articles/10.3389/fmed.2023.1195934/full - Fillmed HEBE2 Clinical Study (2019). Internal clinical data demonstrating the efficacy and safety of NCTF 135 HA in dermal biorevitalization.
- Neauvia Stimulate – Product Information Sheet (2022). PEG-crosslinked HA + CaHA hybrid matrix designed for long-term collagen stimulation.
- Allergan Aesthetics (2021). HArmonyCA Hybrid Filler Clinical Evaluation File. Internal clinical documentation.
- Monografia UMED (2021). Regenerative Techniques in Aesthetic Medicine. University of Medical Sciences, Łódź.
- Goldberg DJ, et al. (2022). Combination Biostimulatory Treatments for Skin Rejuvenation. Dermatologic Surgery,48(5): 554–563.
- MDPI (2024). Current and Future Trends in Cosmetics Research. Basel: MDPI Books.
https://mdpi-res.com/bookfiles/book/11184/Current_and_Future_Trends_in_Cosmetics_Research.pdf - de Sanctis Pecora et al. (2025). Multimodal Treatment Combinations and Layering to Restructure the Aging Face: Recommendations From an Expert Panel. Aesthetic Surgery Journal Open Forum.
https://pmc.ncbi.nlm.nih.gov/articles/PMC12169967/ - de Melo F. et al. (2020). Minimally Invasive Aesthetic Treatment of the Face and Neck Using Combinations of Injectable Fillers, Biostimulators, and Energy-Based Devices. Clinical, Cosmetic and Investigational Dermatology,13: 779–791.
https://www.dovepress.com/article/download/53558 - Lee H. et al. (2023). Comparative histologic evaluation of hybrid hyaluronic acid and polynucleotide fillers in dermal regeneration. Journal of Cosmetic Dermatology, 22(3): 821–830.
