Rejuran Explained: What Salmon-DNA PDRN Does for Your Skin
By Dr. Lydia Park, MD, Medical Director at Seoule K-Beauty Skin Lab. Last updated: July 2026.
Rejuran is a Korean skin-healing treatment made from polynucleotides derived from purified salmon DNA. Applied topically into freshly micro-channeled skin, ideally right after Sylfirm X or microneedling, it repairs damaged skin, strengthens the barrier, boosts hydration and stimulates your own collagen for healthier, more resilient skin. At Seoule K-Beauty Skin Lab in San Diego, it is one of our most popular treatments for long-term skin quality.
Rejuran has earned a cult following in Korea and is often called a skin healer rather than a filler or a booster, and that name is a clue to how it works. Instead of masking a single concern, it improves the fundamental health of your skin. Here is what that means, what the salmon-DNA ingredient actually does, and who benefits most.
What is Rejuran?
Rejuran Healer is a treatment built around polynucleotides, which are fragments of DNA sourced from purified salmon. These molecules happen to be remarkably compatible with human skin, which is why they are so effective at calming and repairing it. Rather than adding volume like a hyaluronic-acid filler, Rejuran works at the cellular level to reinforce the skin barrier, reduce inflammation, deeply hydrate and encourage your own collagen production. The result is skin that is healthier, smoother and more resilient over time.
What are polynucleotides and why salmon DNA?
Polynucleotides are chains of nucleotides, the building blocks of DNA. Salmon DNA is used because its structure is highly similar to human DNA and is well tolerated by the skin, making it an ideal source for a regenerative treatment. When introduced into the skin, these polynucleotides act as a signal that supports cell regeneration and tissue repair, which is exactly why Rejuran is described as healing rather than merely cosmetic.
How does Rejuran work?
Once the polynucleotides are delivered into the skin, they stimulate cell regeneration, support collagen production and strengthen the skin barrier. Over a series of treatments this improves texture, firmness and hydration while reducing inflammation and the appearance of fine lines. Because it reinforces the barrier, skin also becomes calmer and more resilient, holding hydration better and reacting less. This is why the benefits tend to compound rather than fade quickly.
Why is Rejuran applied after Sylfirm X or microneedling?
Rejuran works best when it can penetrate into the skin, and freshly micro-channeled skin allows the polynucleotides to absorb deeply and reach the layers where repair happens. That is why we typically apply Rejuran right after Sylfirm X or a microneedling pass. The combination is powerful: the device remodels collagen and creates the channels, and Rejuran then floods those channels with regenerative signals, amplifying both repair and the glass-skin glow. It is a cornerstone add-on in our Ultimate Rejuvenation plans.
What does Rejuran treat?
Dull, tired or aging skin that has lost its glow.
Fine lines, wrinkles and rough texture.
Enlarged pores and uneven tone.
Mild acne scarring and a weakened skin barrier.
Loss of elasticity and firmness.
Who is a good candidate?
Rejuran is ideal for anyone who wants healthier, more resilient skin rather than a dramatic change, and it is especially loved by clients focused on long-term skin quality, hydration and prevention. Because it calms and strengthens, it also suits sensitive or stressed skin, and even acne-prone skin can benefit. It is a wonderful choice if you feel your skin looks tired, dehydrated or reactive and you want to rebuild its health from within.
How many sessions and how long do results last?
A typical starting course is three to four sessions spaced about two to four weeks apart. Results build gradually as the skin repairs and rebuilds collagen, with many clients noticing improved hydration, texture and radiance within a few weeks. Because Rejuran improves the underlying health of the skin, the benefits are durable, and periodic maintenance sessions keep skin looking smooth, plump and resilient.
What is the downtime and aftercare?
Downtime is minimal. Mild redness, swelling or tiny bumps may appear for one to two days. Avoid touching or rubbing the area, and stay away from heat, strenuous exercise and direct sunlight for twenty-four hours. Keep the skin well hydrated and always apply sunscreen to protect and prolong your results.
Rejuran vs fillers and skin boosters
It is easy to confuse these treatments, but they do different jobs. Fillers add volume and contour. Skin boosters like JuveLook focus on hydration and collagen stimulation. Rejuran focuses on repair and regeneration using polynucleotides. Many clients combine them, using Rejuran for skin health, a booster for hydration and plumping, and Sylfirm X for tightening, to build a complete glass-skin result.
What to expect at your Rejuran appointment
A Rejuran appointment at Seoule is straightforward and comfortable. We begin by cleansing your skin and applying a numbing cream so you stay relaxed. Rejuran is then delivered into the skin, most often right after a Sylfirm X or microneedling pass so the polynucleotides can absorb where they are needed most. The session usually takes thirty to forty-five minutes, and many clients enjoy it as part of a combined glass-skin treatment day. Afterward you may notice mild redness or tiny bumps for a day or two, which settle on their own. Because Rejuran works by improving the underlying health of your skin, the results build gradually over the following weeks rather than appearing all at once, and a planned course of three to four sessions delivers the smoothest, most resilient outcome. We will map your ideal schedule during your free consultation.
Frequently asked questions
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No. Rejuran is a skin healer, not a filler. It does not add volume. It uses salmon-DNA polynucleotides to repair skin, boost hydration and stimulate your own collagen.
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Rejuran is available at Seoule K-Beauty Skin Lab, 7750 Dagget St, Suite 211, San Diego, and is best applied after Sylfirm X or microneedling.
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Yes. Because it calms inflammation and strengthens the barrier, Rejuran is well suited to sensitive and stressed skin, always under our physician supervision.
