What is Redensity II?
Redensity II is a hyaluronic acid based product described as developed for the under-eye area. According to the manufacturer it also contains amino acids, antioxidants and minerals.
The product belongs to the Teosyal PureSense range of the Swiss manufacturer Teoxane and is also written as Redensity 2. The manufacturer describes it as combining cross-linked and non-cross-linked hyaluronic acid at a low total concentration. This design is explained as an attempt to reduce the tendency of a product to attract water and cause swelling in thin, delicate skin.
These details come from the manufacturer and do not mean the product is a better choice for you. Other brands also make hyaluronic acid products for the under-eye area. Products with similar names may differ in composition and indication, so the exact product name, packaging and lot number should be asked about before treatment.
How does it differ from a classic under-eye filler?
Classic fillers are mostly used to fill a hollow with volume. Low-concentration products like Redensity II aim at the look of thin skin and a mild hollow; the difference lies in consistency and injection depth.
In the approach often called tear trough filler, a soft hyaluronic acid gel is placed at a chosen depth, usually along the edge of the hollow. With low-concentration products the aim is less about adding volume and more about supporting thin, crinkle-prone skin. Which approach fits depends on hollow depth, skin thickness and the cause of the discoloration.
This is not a strict rule, and physicians may use products with different techniques. For general information on the hollow, see our tear trough filler page, and for injectable skin-quality options see under-eye mesotherapy.
Who might it suit, and who might it not?
It may be considered for mild to moderate hollows with thin-looking skin. With prominent fat bags, sagging or pigment-related darkness it may not be enough.
Under-eye darkness can come from pigment, visible vessels, thin skin, fat herniation or shadow, and each cause calls for a different method. A hyaluronic acid product can only help the hollow and thin-skin part. If fat bags are prominent, filler can make the area look fuller, and a surgical opinion may be needed.
Pregnancy and breastfeeding, active infection or inflammation in the area, known allergy to components, blood thinners and marked eye-area swelling should be reported to the physician. Swelling from thyroid disease or allergy is investigated first. Suitability is decided at consultation.
How does the process go and how long does it last?
After examination and photo assessment, the product is placed at planned points with a fine needle or cannula. It is gradually broken down by the body; duration varies.
The procedure is usually short, and a topical numbing cream may be used. Mild swelling, redness and bruising can follow and usually ease within several days. Because under-eye skin is thin, bruising can be more visible than in other areas. The final look may not show in the first days because of swelling.
Hyaluronic acid products typically last for months depending on the person, area and product; no exact duration can be promised. If needed, the product can be dissolved with the enzyme hyaluronidase, which the physician performs after confirming the product is hyaluronic acid.
What are the risks and when should you seek care?
Bruising, swelling, small irregularities and a bluish tint can occur. Rarer but serious risks include vascular blockage and vision-related symptoms.
The under-eye area is sensitive for filler. If the product sits too superficially, a bluish reflection or lumpiness can appear, and swelling may last a few weeks. Rarely, injection into or near a vessel may cause skin blanching, severe pain or visual disturbance.
If you have severe pain, a white or purplish patch of skin, blurred or double vision after treatment, contact the treating physician or emergency services immediately. Do not try to manage it yourself.
What should you check about the product and the practitioner?
Ask whether the product is licensed and traceable in Türkiye, whether packaging and lot details are shared, and whether an authorised physician performs the procedure.
Regulatory status such as CE marking can vary by product and region. Different products from the same brand may have different approval statuses, so the status of Redensity II in a given country should be confirmed from product documents and the relevant authority. An FDA approval may concern another under-eye product of the same brand, and the names should not be confused.
Before looking at price or brand, ask about the practitioner’s authorisation, product authenticity and the plan for managing complications. At consultation, Dr. Berktaş discusses which approach suits the under-eye area.
Frequently asked questions
What is Redensity II used for?
According to the manufacturer it is used for the tear trough and thin under-eye skin with signs of ageing. Suitability is assessed at consultation.
How long does Redensity II last?
Hyaluronic acid based products are gradually broken down by the body, and the duration varies from months depending on the person and area.
Does it remove dark circles?
Dark circles may come from pigment, vessels or shadow. The product can only help the hollow and thin-skin part; the cause is determined at consultation.
Is the procedure painful?
Most people describe a mild pricking feeling. A topical numbing cream may be used to reduce discomfort.
Will it bruise?
Under-eye skin is thin, so bruising can occur and usually fades within several days to a week.
Can it be reversed if I dislike it?
Hyaluronic acid products can be dissolved with the enzyme hyaluronidase. This decision and procedure belong to the physician.
Sources (3)
- Aesthetic Plastic Surgery: Real-World Evidence on the Routine Use, Efficacy, and Safety of a Hyaluronic Acid-Based Dermal Filler in the Periorbital Region (2025)
- Trinh LN et al. (Facial Plastic Surgery): Dermal Fillers for Tear Trough Rejuvenation: A Systematic Review (2022)
- Medical Device Coordination Group (European Commission): MDCG 2023-5 Guidance on qualification and classification of Annex XVI products – A guide for manufacturers and notified bodies (2023)
This content is for general information and does not replace a personal medical assessment.