Rejuran and Polynucleotides: What Skin Boosters Are Actually Doing BTS

The term "skin booster" has been adopted loosely enough to describe everything from hydrating injections to deep moisturizing treatments. That vagueness is worth addressing, because beneath the marketing there is a category of treatments with meaningful clinical evidence and specific biological targets.

Rejuran, salmon DNA, and polynucleotide (PN) therapies all operate through similar mechanisms, with some important distinctions. Understanding the science gives you the ability to assess whether any of these options are appropriate for your skin goals.

Polynucleotides vs. PDRN: The Actual Difference

Polynucleotides (PN) and polydeoxyribonucleotides (PDRN) are often used interchangeably, but they are not identical. PDRN is a shorter-chain fraction of the polynucleotide family. PN encompasses a broader range of chain lengths.

Both are derived from salmon DNA and both activate adenosine A2A receptors. The clinical evidence for PDRN is more robust simply because it has been studied longer. PN treatments show comparable mechanisms with some differences in the speed and profile of cellular response.

For practical purposes, the distinction matters most to clinicians choosing between protocols rather than to patients comparing treatment outcomes.

What Rejuran Is

Rejuran is a brand name for a PN-based injectable developed in South Korea by Pharmic. It became one of the most popular aesthetic treatments in Korea before spreading globally, particularly in aesthetic markets with access to clinical-grade DNA-based treatments.

It is administered as a series of micro-injections into the dermis. The polynucleotide molecules activate cellular repair mechanisms, increase fibroblast activity, stimulate collagen and elastin synthesis, and improve microvascular supply to the skin.

Clinical results include improved skin elasticity, reduction in fine lines, more even texture, and a measurable decrease in skin sensitivity and reactivity over time. Multiple studies in peer-reviewed dermatology journals have documented these outcomes.

What the Treatment Experience Involves

Rejuran treatments are typically administered in a clinical setting by a qualified aesthetic practitioner. Sessions involve multiple micro-injections across the treatment area, often with topical anesthetic applied beforehand.

The initial phase usually involves three sessions spaced two to four weeks apart. After that, most practitioners recommend maintenance sessions every three to six months.

Mild swelling, redness, and small injection-site bumps are normal in the 24 to 48 hours following treatment. These resolve without intervention. The skin during this window needs gentle, supportive care, and aggressive actives should be avoided.

Topical Polynucleotides: What They Can and Cannot Do

The injectable form of Rejuran and similar treatments operates at the dermal level, which is where the fibroblasts and vascular structures targeted by the treatment reside. Topical polynucleotide products work at the epidermal level, which limits but does not eliminate their efficacy.

Topical PN products have demonstrated improvements in surface hydration, reduction in TEWL, and mild increases in surface collagen density. They are a meaningful complement to injectable protocols and a useful standalone option for people who are not ready for injectable treatments.

The key is matching the treatment depth to the skin concern. Surface hydration and minor texture improvements are achievable topically. Structural repair and significant elasticity changes require dermal-level delivery.

Who Is a Good Candidate

People most likely to see significant results from Rejuran treatments include those with: fine lines and crepiness from collagen loss, persistent skin sensitivity and reactivity, shallow acne scarring, skin that appears thin or lacks resilience, and post-procedure skin that has not fully recovered.

The treatment is suitable for a broad age range. Younger patients in their late twenties or early thirties may use it preventively, while older patients use it for structural restoration. It is not a treatment for deep wrinkles or volume loss, which require different interventions.

Supporting a Skin Booster Protocol at Home

The results from injectable skin boosters are extended and enhanced by a consistent at-home routine. In the days following treatment, focus on barrier-supportive ingredients: ceramides, centella asiatica, peptides, and lightweight moisture.

As the skin stabilizes after the initial treatment series, a topical PDRN or PN serum used daily maintains the cellular communication that the injections initiated. This is not redundant with the injectable treatment. It is complementary.

Protect the investment with consistent SPF. UV exposure degrades the collagen and elastin that the treatment worked to build.