Best Treatments for Fine Lines: Rejuran vs Juvelook

Fine lines are often the earliest visible sign of skin ageing. They appear around the eyes, on the cheeks, across the forehead and around the mouth, and are usually linked to thinning skin, reduced hydration and gradual collagen loss rather than strong muscle movement.

Korean clinics are known for skin boosters, injectables designed to improve skin quality rather than add volume. Two of the most popular for fine lines are Rejuran, a polynucleotide product, and Juvelook, a PDLLA and hyaluronic acid product. Both are widely used, but they take different approaches. This article explains the differences and how to choose between them.

What causes fine lines?

Fine lines develop when the skin's supporting network of collagen and elastin weakens and the skin holds less moisture. Ultraviolet exposure, pollution, smoking, poor sleep and natural ageing all contribute. Unlike deep wrinkles or folds, fine lines are often more noticeable in certain lighting, after poor sleep or when the skin is dehydrated. Because they are rooted in skin quality, they tend to respond well to treatments that improve the dermis.

How Rejuran works

Rejuran contains polynucleotides (PN) extracted and purified from salmon DNA. It is injected in small amounts across the treatment area and is used with the aim of supporting the skin's natural repair and regeneration processes. Patients often describe improvements in texture, elasticity, fine lines and overall resilience after a course.

• Main focus: skin repair, elasticity and sensitive or damaged skin.
• Sessions: commonly a course of three to four sessions about two to four weeks apart.
• Downtime: small raised bumps at injection points typically settle within one to two days; bruising is possible.
• Variants: Rejuran Healer for the face, Rejuran I for the eye area and Rejuran S for certain scars.

Treatment can be uncomfortable, so numbing cream is usually applied. People with a salmon or fish allergy should mention this beforehand.

How Juvelook works

Juvelook combines PDLLA (poly-D,L-lactic acid) microparticles with hyaluronic acid. The hyaluronic acid provides some early hydration, while the PDLLA stimulates new collagen gradually over several months. It is often chosen for skin density, fine lines, enlarged pores and mild acne scarring. A thicker version, Juvelook Volume, is used for deeper volume restoration.

• Main focus: collagen stimulation, skin thickness and texture.
• Sessions: often two to three sessions spaced several weeks apart, depending on the plan.
• Downtime: small bumps, redness and possible bruising for a few days.
• Results: develop gradually over the months following treatment and can last longer than many hydration-based boosters.

Correct dilution and injection depth are important, as collagen-stimulating particles can occasionally form small nodules if placed incorrectly.

Rejuran vs Juvelook: comparison

• Active ingredient: Rejuran uses polynucleotides; Juvelook uses PDLLA with hyaluronic acid.
• Mechanism: Rejuran supports repair and resilience; Juvelook mainly stimulates collagen.
• Best for: Rejuran for sensitive, thin or stressed skin and fine crepey lines; Juvelook for loss of density, pores and textural lines.
• Speed: both improve gradually; Juvelook may take longer to reach its full effect as collagen builds.
• Sessions: both are usually done as a course.
• Longevity: Juvelook's collagen effect is often described as longer-lasting; Rejuran is typically maintained with periodic sessions.
• Comfort: both can sting; numbing is standard.

Which should you choose?

• Sensitive, irritated or thin skin with fine lines: Rejuran is often recommended because of its repair-oriented profile.
• Fine lines with enlarged pores or loss of firmness: Juvelook may suit you better because of its collagen-building effect.
• Fine lines around the eyes: Rejuran I is specifically designed for the delicate eye area.
• Wanting longer intervals between treatments: Juvelook may be preferred by some patients.
• Wanting to improve several concerns at once: some doctors alternate or combine the two over a treatment programme.

Both boosters are also often combined with energy treatments such as low-energy lasers or radiofrequency, and with botulinum toxin if expression lines are part of the problem.

Risks and who should be cautious

Common side effects include redness, swelling, injection-site bumps and bruising. Less commonly, prolonged lumps, infection or allergic reactions may occur. People who are pregnant or breastfeeding, those with active skin infection, acne flares or cold sores in the area, and people with known allergies to ingredients should delay or avoid treatment. Anyone prone to keloid scarring or with autoimmune conditions should discuss their history first.

Planning boosters during a trip to Korea

Boosters are a practical choice for visitors because downtime is short. However, both products typically need a course of sessions, which may not fit a single trip. Ask the clinic how many sessions are realistic during your stay and whether the same or a comparable product is available in your home country. Avoid scheduling injections the day before photographs or an important event, and follow aftercare advice about avoiding make-up, saunas and alcohol for a short period. A gentle skincare routine and daily sunscreen help maintain the improvement.

Conclusion

Rejuran and Juvelook are both effective, popular skin boosters for fine lines, but they work in different ways. Rejuran focuses on repair and resilience, making it well suited to sensitive and thin skin, while Juvelook focuses on collagen stimulation and density, which helps with texture and firmness. The best choice depends on your skin type, concerns and schedule, and a dermatologist can help you decide whether one or both should be part of your plan.

This article is for general information only and is not a substitute for a medical consultation. Suitability, results and recovery vary from person to person.