Quick answer: For tired-looking eyes, under-eye filler fills hollows and tear trough grooves with soft hyaluronic acid, giving an instant smoother contour. Rejuran i is a polynucleotide booster made for the delicate eye area that repairs thin, crepey skin and fine lines over a series. Choose filler for hollows, and Rejuran i for thin, wrinkled or darker-looking skin.
Key takeaways
- Tired eyes can come from hollows, thin skin, pigment or puffiness.
- Filler restores volume in the tear trough; Rejuran i improves skin quality.
- Filler results are immediate; Rejuran i builds over two to four sessions.
- Filler is not suitable for everyone, especially with under-eye bags.
- Many people combine a little filler with Rejuran i.
Why do eyes look tired?
The under-eye area has thin skin and little fat. With age, the tear trough can become hollow, the skin can thin and wrinkle, blood vessels can show through and cause darkness, and fat can bulge forward to form bags. Lack of sleep and genetics also play a part. Each cause needs a different treatment, so a proper check is important.
What is under-eye filler?
Under-eye filler uses a soft hyaluronic acid (HA) filler placed carefully along the tear trough to fill hollows and smooth the transition between the lower eyelid and cheek. It can make shadows less visible and the face look more rested straight away. Results usually last about 9 to 12 months or longer. HA filler can be dissolved if needed.
What is Rejuran i?
Rejuran i is a version of Rejuran made by PharmaResearch for the eye area. It contains polynucleotides (PN) in a form designed for thin, delicate skin. Injected in small amounts under the eyes, it supports skin repair, elasticity and thickness, which can soften fine lines, crepey texture and the look of darkness caused by thin skin.
How do under-eye filler and Rejuran i compare?
- Main action: filler adds volume; Rejuran i repairs and thickens skin.
- Best for: filler for hollows and grooves; Rejuran i for thin, crepey or wrinkled skin.
- When results show: filler right away; Rejuran i gradually.
- Sessions: filler usually one; Rejuran i often two to four.
- Downtime: filler mild swelling or bruising; Rejuran i small bumps for a day or two.
- Reversibility: HA filler can be dissolved; Rejuran i simply fades.
When is filler the better choice?
Filler is often better when a clear groove or hollow runs under the eye and creates a shadow, and the skin is still reasonably thick. A small, careful amount can make a big difference. It is not usually recommended if you have large under-eye bags or puffiness, as it can make them look worse.
When is Rejuran i the better choice?
Rejuran i is often better when the skin is thin, crepey or finely wrinkled, or when darkness is caused by visible blood vessels under thin skin. It is also a good choice for people who prefer not to have filler near the eyes, or who want a gentle, gradual improvement.
Can you combine them?
Yes. A common plan is a small amount of filler for the hollow plus Rejuran i for skin quality. This often gives a more natural, rested look than using a large amount of filler alone. Your doctor will plan the order and spacing.
What is the downtime?
After under-eye filler, mild swelling and possible bruising may last a few days to a week. After Rejuran i, small bumps usually settle within a day or two, and small bruises are possible. Concealer can usually be used the next day.
Is it safe?
Both are safe in experienced hands. The under-eye area is delicate, so filler must be placed slowly and in the right layer to avoid lumps, a bluish tint or, rarely, blood vessel complications. Rejuran i side effects include bumps and bruising. Tell your doctor about fish allergies before Rejuran.
How to choose
Korea treated about 2.01 million foreign patients in 2025, and around 63% came for dermatology, according to the Ministry of Health and Welfare. Under-eye treatments are popular with visitors. The right choice depends on whether your tired look comes from volume loss, thin skin or both.
Frequently asked questions
Can Rejuran i remove dark circles?
It can improve darkness from thin skin, but pigment-related dark circles may need other treatments.
How long does under-eye filler last?
Often about 9 to 12 months or longer.
Is filler safe for under-eye bags?
Usually not. Bags often need other treatments or surgery.
How many Rejuran i sessions do I need?
Often two to four, a few weeks apart.
Sources
- Ministry of Health and Welfare, Republic of Korea – 2025 foreign patient statistics (press release, 2026).
- Ministry of Food and Drug Safety, Republic of Korea – medical device approval information (Rejuran; hyaluronic acid fillers).
- PharmaResearch – Rejuran i product information.
This article is for general information only and is not medical advice. Results vary between individuals. Please consult a qualified physician before any treatment.
