PDRN for Neck Lines: What the Evidence Shows and What to Expect

How PDRN Targets Neck Lines

The neck-specific evidence for PDRN-type products is thin, so it helps to separate what has been shown from what is inferred. The most direct evidence is for injections. In a real-world study of an injectable polynucleotide product (PN HPT, sold as Plinest), 66 patients received three sessions of intradermal injections to the face, neck or décolleté; clinicians rated more than 93 percent of the 33 treated necks as moderately to significantly improved, and there were no serious side effects. That study had no control group and used clinician and patient ratings rather than measurements, so it shows the treatment is well tolerated and that patients and doctors saw improvement, not how large the effect is. Polynucleotides are a close relative of PDRN, made of longer DNA chains from salmon or trout, and a review of injectable skin boosters discusses the two together. A 2026 systematic review found only seven randomized trials across all PN and PDRN skin uses, small and varied in design, with wrinkle-related outcomes improving but the evidence still limited. For topical PDRN, the best data come from a 2026 study of a medium-length PDRN: in UV-damaged skin samples it increased collagen and elastic-fiber proteins, and in a 28-day split-face trial a 0.1 percent PDRN eye cream improved periocular wrinkles and dermal thickness about twice as much as 0.1 percent retinol. That is an eye-area study of one specific preparation, not a neck study, and other PDRN serums may not behave the same way. In practice, a topical PDRN product is a reasonable, gentle addition to a neck routine built on daily sunscreen below the jawline, and for etched lines or bands the options with real track records are in-clinic: injectable boosters such as PN, fillers, botulinum toxin or energy devices, only in licensed hands.

Horizontal neck lines (sometimes called necklace lines) come from repeated folding during neck flexion, gradual loss of dermal collagen and elastin, and sun damage, until temporary folds become permanent. Vertical bands come from the platysma, the thin sheet of muscle under the neck skin, separating into visible cords with age. Different causes call for different tools: botulinum toxin for banding, fillers for etched horizontal creases, energy devices for laxity, and surgery for severe cases. Daily sunscreen on the neck and a retinoid, if tolerated, are the best-proven home steps.

PDRN (polydeoxyribonucleotide) and the related polynucleotides (PN) are used as injectable skin boosters, including on the neck. In an observational study of polynucleotide injections, clinicians rated most treated necks as moderately to significantly improved, though there was no control group. Topical PDRN has less evidence, and none on the neck itself: the closest is a small trial in which a PDRN eye cream improved wrinkles and dermal thickness around the eyes over four weeks. PDRN may soften fine crepey lines and improve skin quality; it will not erase deep creases or treat platysmal bands.