Under Eye Filler vs Rejuran: Which Is Better for Dark Circles?
Dark circles can have several different causes, including tear-trough hollowness, thin under-eye skin, pigmentation, visible blood vessels, and age-related volume loss. This is why under-eye filler and Rejuran are designed to address different problems. Hyaluronic acid (HA) filler primarily restores lost volume and reduces shadows caused by hollowness, while Rejuran, a polynucleotide-based injectable, focuses more on improving skin quality, elasticity, and fine lines. The better option depends on what is actually causing your dark circles.
What Is Under Eye Filler?
Under-eye filler usually refers to a carefully placed hyaluronic acid filler designed to improve the appearance of the tear trough. Instead of changing the skin itself, the filler adds volume beneath the hollow area, reducing the depth of the shadow.
Under-eye filler may be suitable for:
- Tear-trough hollowness
- Volume loss beneath the eyes
- Shadowing caused by facial structure
- A tired appearance related to under-eye depression
- Patients seeking relatively immediate contour improvement
Because the under-eye area is thin and anatomically delicate, filler requires particularly precise placement and conservative correction.
What Is Rejuran for Under Eyes?
Rejuran is a polynucleotide-based injectable treatment designed to improve skin quality rather than simply add volume. Rejuran I, in particular, is commonly used around the eyes because the formulation and treatment approach are intended for delicate skin.
It may help improve:
- Thin or fragile-looking under-eye skin
- Fine lines
- Crepey texture
- Reduced elasticity
- Dryness and roughness
- Mild dark-circle appearance associated with poor skin quality
Rejuran does not work like a conventional HA filler. Its primary purpose is skin rejuvenation rather than physically filling a deep tear trough.
Under Eye Filler vs Rejuran: Key Difference
The easiest way to understand the difference is volume correction vs skin-quality improvement.
Under-eye filler:
- Adds physical volume
- Fills a tear-trough depression
- Reduces shadows caused by hollowness
- Produces a relatively immediate contour change
- Often requires only one treatment session
Rejuran:
- Uses polynucleotides to support skin rejuvenation
- Improves skin texture and elasticity
- Targets fine lines and thin skin
- Produces gradual changes
- Often performed as a series of treatments
Clinical comparisons of polynucleotide and HA treatments around the eyes suggest that both can improve the overall appearance, while PN treatments may show particular advantages in measures related to skin quality such as elasticity and hydration. (PubMed)
Which Is Better for Dark Circles?
There is no single treatment that is best for every type of dark circle.
Under-eye filler may be better when:
- The main problem is a visible tear trough
- Hollowing creates a dark shadow
- There is noticeable volume loss
- The skin quality itself is relatively good
- You want immediate structural improvement
Rejuran may be better when:
- The under-eye skin is thin
- Fine lines are prominent
- The skin looks crepey or dehydrated
- Mild discoloration is associated with poor skin quality
- You want gradual rejuvenation without adding significant volume
If dark circles are primarily caused by pigmentation, neither filler nor Rejuran may fully address the underlying problem. A different treatment plan may be necessary.
Which Is Better for Under-Eye Hollows?
For a true tear-trough hollow, HA filler generally has the more direct effect because it physically restores volume. Rejuran can improve the quality of the overlying skin, but it does not provide the same structural correction.
Patients with significant hollowing may notice:
- A deeper depression between the lower eyelid and cheek
- Dark shadows that become more obvious under certain lighting
- A tired appearance despite adequate sleep
- A noticeable difference between the under-eye and cheek volume
In these cases, carefully placed filler may create a more immediate improvement.
However, under-eye filler must be used conservatively because excessive product can contribute to puffiness or an unnatural appearance.
Which Is Better for Thin Under-Eye Skin?
Rejuran can be more appropriate when the primary concern is the quality of the skin rather than a lack of volume. Polynucleotide treatments have been studied for periorbital rejuvenation, with research showing improvements in areas such as skin elasticity, hydration, and surface characteristics. (PubMed)
It may be particularly appealing for patients who have:
- Very thin under-eye skin
- Fine crepey lines
- Early signs of aging
- Mild laxity
- A translucent or tired-looking appearance
Because Rejuran is not intended to substantially fill a hollow, the improvement develops progressively rather than appearing immediately after treatment.
Results, Sessions & Recovery
The treatment experience is also different.
Under-eye filler:
- Visible volume correction immediately
- Swelling or bruising may occur
- Results become easier to assess as swelling settles
- Longevity depends on the specific HA product and individual factors
Rejuran:
- Results develop gradually
- Multiple sessions are commonly recommended
- Temporary redness, swelling, or small injection bumps may occur
- Improvements focus more on skin quality than contour
- Maintenance treatments may be recommended
For foreign patients visiting Korea, treatment timing is important. Under-eye injections can temporarily cause swelling or bruising, so scheduling the procedure immediately before a major event or flight may not be ideal.
How Much Do They Cost in Korea?
Prices vary according to the clinic, product, treatment area, amount used, and number of sessions.
A general reference range is:
- Under-eye HA filler: approximately ₩300,000–₩700,000+ per treatment
- Rejuran I / under-eye Rejuran: approximately ₩100,000–₩300,000+ per session
- Rejuran treatment course: costs more when multiple sessions are recommended
Budget clinics: lower
Premium doctor-led clinics: higher but more precise
When comparing prices, check whether the quote includes the entire syringe, the amount injected, anesthesia, and any follow-up treatment.
Can Under Eye Filler and Rejuran Be Combined?
In some patients, combining structural correction with skin-quality treatment may make sense. For example, a patient may have both a noticeable tear trough and thin, crepey skin.
A customized approach may involve:
- HA filler: correcting significant volume deficiency
- Rejuran: improving surrounding skin quality
- Other treatments: addressing pigmentation or vascular discoloration when appropriate
The treatments should not automatically be combined simply because more treatment seems better. The under-eye area is highly delicate, and excessive intervention can sometimes create an unnatural or puffy appearance.
Final Thoughts
When comparing under-eye filler vs Rejuran for dark circles, the key question is not which treatment is universally better, but what is causing the darkness. If tear-trough hollowness and volume loss create the primary shadow, under-eye HA filler may provide the more direct correction. If thin, crepey, dehydrated skin and fine lines are the main concern, Rejuran may be a better fit for gradual skin-quality improvement. Some patients have a combination of concerns and may benefit from a carefully planned combination approach. The best treatment should therefore be selected after evaluating the under-eye anatomy, skin quality, pigmentation, and source of the dark-circle appearance.
