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Salmon DNA skin boosters have become one of the signature treatments of Korean dermatology. Often marketed under names such as Rejuran, they are used for skin quality concerns ranging from fine lines and dullness to sensitive, recovering skin. The terms PN and PDRN appear frequently on clinic menus, but they are not identical, and understanding the difference can help when choosing a treatment.
This article explains what these ingredients are, how they are thought to work, what they are typically used for, and what to expect if you have them in Korea.
What are PN and PDRN?
Both PN and PDRN are made from purified DNA fragments, most commonly sourced from salmon or trout. The DNA is processed and purified to remove proteins and other components, leaving fragments that can be used in medical and cosmetic products.
- PDRN (polydeoxyribonucleotide) consists of shorter DNA fragments. It has been used in medicine, including in some wound-healing applications, and is often described as supporting tissue repair.
- PN (polynucleotide) consists of longer DNA chains and forms a more viscous gel. Because of its structure, it is often described as remaining in the tissue for longer and providing some supportive scaffolding as well as repair signals.
In practice, Korean clinics commonly use PN products such as Rejuran for skin quality, while PDRN appears in boosters, topical products and some combination treatments.
How they are thought to work
PN and PDRN are believed to support the skin's natural repair processes. Proposed mechanisms include helping fibroblasts, the cells that produce collagen, to function more effectively, supporting tissue regeneration and having anti-inflammatory effects. Laboratory and clinical studies have reported benefits, but research on cosmetic outcomes is still developing, and results in everyday practice vary between individuals.
Rather than adding volume or filling lines, these boosters aim to improve the condition of the skin gradually, so results are usually subtle and build over a course of treatments.
What PN and PDRN boosters are used for
- Fine lines and early signs of ageing, especially on the cheeks and around the eyes.
- Thin, dull or tired-looking skin that lacks resilience.
- Sensitive or reactive skin, sometimes as part of a recovery plan.
- Support after lasers or other procedures, to help the skin recover.
- Mild acne scarring and uneven texture, often combined with other treatments.
- Under-eye crepiness, using formulations designed for this delicate area.
Because PN and PDRN focus on the condition of the skin, they are often combined with other approaches. A doctor might pair them with laser toning for tone, with a hyaluronic acid booster for hydration, or with an energy-based device for firmness. The aim is to address several aspects of skin quality without relying on one product to do everything.
The treatment process
A consultation should come first, including questions about allergies, particularly to fish or seafood. Numbing cream is usually applied for a period before treatment. The product is then injected into the dermis, either manually with many small injections or with an injector device. Treatment of the full face often takes around 20 to 30 minutes.
PN boosters are known for being somewhat uncomfortable, even with numbing, because of the number of injection points and the viscosity of the product. Some formulations include lidocaine to improve comfort.
Sessions, results and longevity
A typical course is around two to four sessions spaced roughly two to four weeks apart, though plans vary by clinic and concern. Many patients notice that their skin looks healthier and more refined after the second or third session, with continued improvement over the following weeks.
Results are gradual and natural-looking rather than dramatic. Maintenance is often recommended every few months to once a year, depending on age, skin condition and goals.
Downtime and side effects
The most noticeable short-term effect is small raised bumps at the injection points, which commonly settle within a day or two. Other common effects include redness, mild swelling and bruising. Most people can return to normal activities the next day, although visible bumps may make some people prefer to stay in on the day of treatment.
Rarer risks include infection, prolonged lumps or allergic reactions. Choosing an experienced practitioner and following aftercare advice reduces these risks.
Who should be cautious
- People with allergies to fish or salmon-derived products.
- Pregnant or breastfeeding women.
- Anyone with active skin infection, acne flare or cold sores in the area.
- People with autoimmune conditions or bleeding disorders, who should seek individual advice.
- Those expecting volume or lifting, which PN and PDRN do not provide.
Practical tips for visitors to Korea
Because bumps and occasional bruising are common, it is sensible to have PN or PDRN boosters a few days before any important event rather than the day before. If you are combining boosters with lasers, ask the doctor about the order of treatments. Request confirmation of the exact product used, ask whether the quoted price covers one session or a course, and keep written aftercare in English. Daily sun protection remains essential to protect any improvement.
It is also helpful to keep realistic expectations about product names. Several brands of PN and PDRN boosters exist, with different concentrations and formulations, and clinics may use the name of one well-known brand loosely. Asking which product will actually be injected avoids confusion.
Conclusion
Salmon DNA boosters, including PN products such as Rejuran and PDRN-based treatments, aim to improve skin quality by supporting the skin's own repair processes. They offer gradual, natural-looking results with short-lived downtime, which makes them popular in Korea. Understanding the difference between PN and PDRN, and discussing allergies and goals with a dermatologist, helps ensure the treatment matches your needs.
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.
