STYLAGE® L BI-FLEX®

STYLAGE® L BI-FLEX® — Injectable Hyaluronic Acid Filler for Deep Wrinkles & Facial Volume Loss

Product Specifications

• Drug Class: Injectable hyaluronic acid dermal filler (cross-linked, BI-FLEX® technology, no lidocaine)
• Active Ingredients: Hyaluronic acid (cross-linked) 24mg/g; Mannitol 9mg/mL
• Manufacturer: Laboratories VIVACY
• Brand: STYLAGE®
• Country of Origin: France
• Strength: 24mg/g HA; 9mg/mL Mannitol
• Dosage Form: Injectable gel — 2 × 1mL prefilled syringes + 4 × 30G ½ needles
• Regulatory Status: CE-marked (EU); not currently approved by the US FDA (current as of mid-2026)

Mechanism of Action of STYLAGE® L BI-FLEX® Injection

STYLAGE® L BI-FLEX® injection uses cross-linked hyaluronic acid to restore tissue volume and smooth deep wrinkles at the injection site. Once placed into the dermal or subcutaneous tissue, the gel binds water and provides structural support in areas affected by age-related volume loss, including nasolabial folds and marionette lines.

The formulation incorporates IPN-Like Technology™ (Interpenetrating Network), which combines two interlocked HA polymer networks to improve cohesivity, elasticity, and resistance to mechanical deformation compared with single-network fillers. This BI-FLEX® rheological profile supports smooth injection flow, even gel distribution, and adaptability across different facial treatment areas.

Mannitol at 9mg/mL acts as a free-radical scavenger that may help reduce oxidative degradation of hyaluronic acid after treatment, thereby contributing to extended filler longevity and improved gel stability in clinical use.

STYLAGE® L BI-FLEX® does not contain co-formulated lidocaine. Anesthesia should therefore be managed separately according to practitioner preference, through topical agents or local anesthetic techniques.

The gel gradually degrades through enzymatic hydrolysis by endogenous hyaluronidase. If reversal becomes clinically necessary, the product may be dissolved with a hyaluronidase injection in accordance with accepted safety protocols.

About STYLAGE® L BI-FLEX® — A Versatile Dermal Filler

STYLAGE® L BI-FLEX® is a Stylage dermal filler indicated for deep wrinkle correction and restoration of facial volume loss. It is also known as BI-soft — an alternative name used for practitioner reference and procurement. Its BI-FLEX® rheological profile balances flexibility with lifting capacity, supporting smooth placement and natural-looking correction across dynamic facial regions. Packaging includes 2 × 1mL syringes and four 30G ½ needles suitable for precise administration across varied treatment areas and injection planes.

For practitioners evaluating whether STYLAGE® is a good filler, commonly cited advantages include IPN-Like Technology™, mannitol-enhanced stability, CE-marked status, and versatility across multiple aesthetic indications. Within the STYLAGE® filler range, STYLAGE® L BI-FLEX® is positioned for deeper folds and moderate contour restoration.

Is STYLAGE® L BI-FLEX® FDA-Approved?

The product is CE-marked for professional aesthetic use in the EU and is not currently approved by the US FDA. Practitioners operating outside the EU should independently verify local regulatory clearance before ordering or administering this product.

Clinics intending to buy STYLAGE® L BI-FLEX® wholesale should confirm sourcing arrangements aligned with local licensing and storage regulations and contact Medica Depot’s support representatives for sourcing information and documentation support.

Indications & Clinical Use

To achieve optimal results, treatment must be customized based on a thorough pre-treatment assessment. Practitioners should carefully evaluate the patient’s skin type, tissue thickness, age-related structural changes, lifestyle factors, and history of prior filler treatments to determine the precise volume and technique required.

The product is clinically indicated for the following aesthetic applications:

• Deep Wrinkle Correction: Targeted treatment of deep static wrinkles, including nasolabial folds, marionette lines, perioral rhytids (lip lines), and selected glabellar (frown) lines where deep structural support is needed.
• Facial Volume Restoration: Structural volumizing and contouring of the cheeks, chin, and jawline to correct age-related volume loss.

Depending on the specific treatment area and the degree of volume loss, injections are placed into the mid-to-deep dermis or the superficial subcutaneous plane. The filler’s precisely calibrated rheological profile allows practitioners to utilize various delivery methods based on the anatomical target, including:

• Serial puncture
• Linear threading
• Fanning techniques

Safety Requirement

STYLAGE® L BI-FLEX® must exclusively be administered by licensed aesthetic medicine professionals who are thoroughly trained in facial anatomy and emergency complication management. Practitioners must strictly adhere to aseptic technique, thoroughly screen for patient contraindications, and take all necessary precautions to avoid intravascular injection.

Administration, Side Effects & Safety

STYLAGE® L BI-FLEX® injection is typically administered into the mid-to-deep dermis or subcutaneous tissue, depending on patient anatomy and treatment goals. Injection depth should be adjusted based on the severity of volume loss and the intended correction outcome.

Because the formulation does not contain lidocaine, topical or local anesthesia may be applied separately before treatment to improve patient comfort. Practitioners should use an appropriate injection technique and maintain awareness of vascular anatomy throughout the procedure.

Following treatment, patients should be advised to avoid sun exposure, heat exposure, and pressure on the treated area until redness or swelling subsides. Patients should also avoid strenuous physical activity, alcohol, and facial heat treatments in the immediate post-treatment period.

Common Adverse Events

Common side effects include redness, swelling, tenderness, and bruising at the injection site. These reactions are typically transient and resolve within a few days without intervention.

Serious Adverse Events (Rare)

Although uncommon, serious adverse events associated with HA fillers may include vascular occlusion, skin necrosis, delayed inflammatory reactions, and visual disturbance resulting from inadvertent intravascular injection. Practitioners should maintain access to hyaluronidase and follow established emergency management protocols when necessary.

Patients should be screened for hypersensitivity to hyaluronic acid products, active skin infection, or a history of severe allergic reactions prior to treatment. This section is a clinical summary only; practitioners must consult the full Instructions for Use (IFU) provided with the product for the complete list of contraindications, warnings, precautions, and adverse event management protocols.

Legal & Regulatory Status

STYLAGE® L BI-FLEX® is manufactured in France by Laboratories VIVACY and carries CE marking for professional aesthetic use within the European Union. Use is restricted to licensed medical professionals and registered aesthetic clinics that operate in accordance with local regulatory requirements. As of 2026, STYLAGE® L BI-FLEX® is not approved by the US FDA. Practitioners should verify local compliance requirements before procurement or administration.

When buying online, practitioners should ensure sourcing occurs through authorized and traceable distribution pathways. Regulatory information on this page is current as of 2026 and is subject to change.

Practitioners wishing to buy STYLAGE® or buy dermal fillers through an authorized channel should confirm product authenticity and documentation with their chosen distributor. For sourcing guidance, contact Medica Depot’s support representatives.

Citations

1. Ramos-E-Silva M, Fonteles L, Lagalhard C, Fucci-Da-Costa A. STYLAGE: a range of hyaluronic acid dermal fillers containing mannitol. Physical properties and review of the literature. Clin Cosmet Investig Dermatol. 2013;6:257. doi: 10.2147/ccid.s35251
2. Wu Y, Ascher B, Yang Z, et al. Effectiveness and safety of a cross-linked hyaluronic acid plus mannitol filler for the correction of nasolabial folds in Chinese subjects: a randomized, blinded, controlled study. Aesthet Surg J. 2025;46(5):466-477. doi: 10.1093/asj/sjaf186
3. Papakonstantinou E, Roth M, Karakiulakis G. Hyaluronic acid: a key molecule in skin aging. 2012;4(3):253-258. doi: 10.4161/derm.21923

The contents of this page are meant for licensed medical professionals. They serve informational purposes only and are not to be taken as medical advice.