PDRN Therapy at Greenwich MD: a regenerative biologic treatment using purified salmon-derived DNA fragments to activate deep tissue repair, stimulate collagen and elastin production, and restore skin at the cellular level — administered personally by Dr. Susana Querido in Stamford, CT. Related: Injectables at Greenwich MD →
Medically reviewed by Susana Querido, MD – Triple Board-Certified in Family Medicine, Aesthetic Medicine, and Anti-Aging & Regenerative Medicine. Medical Director, Greenwich MD.
PDRN therapy — short for polynucleotide therapy — is a regenerative biologic treatment derived from purified DNA fragments extracted from salmon sperm cells. These fragments, called polydeoxyribonucleotides, share a high degree of structural compatibility with human DNA, which makes them exceptionally effective as biological signaling molecules when introduced into tissue. Rather than simply filling or paralyzing, PDRN works at a cellular level: it activates adenosine A2A receptors on fibroblasts, triggering a cascade of repair and regeneration that the skin’s own biology then carries forward. The result is tissue that genuinely rebuilds itself — not just surface-level improvement.
At Greenwich MD, PDRN therapy is positioned as a complementary regenerative add-on that amplifies the results of other treatments rather than a standalone procedure. When paired with microneedling, RF microneedling, skinbooster injections, or hair restoration protocols, PDRN provides the cellular fuel those treatments need to achieve deeper, more durable outcomes. Think of it as the biological amplifier in a well-designed regenerative protocol — the ingredient that tells the body to keep rebuilding long after the treatment session ends. Patients dealing with collagen loss, skin laxity, under-eye hollowing, or thinning hair are among those who benefit most.
Here is a brief overview of what to expect from PDRN therapy at Greenwich MD.
Once introduced into target tissue, PDRN molecules bind to adenosine A2A receptors on resident fibroblasts — the cells responsible for producing collagen, elastin, and hyaluronic acid. This binding activates a pro-regenerative signaling pathway that accelerates fibroblast proliferation, increases collagen and elastin synthesis, stimulates new microvessel formation (angiogenesis), and suppresses the inflammatory cytokines that contribute to tissue degradation and scarring. Simultaneously, PDRN provides a pool of nucleotide building blocks that cells use directly for DNA repair and replication, a process sometimes called the “salvage pathway.” The net effect is measurably improved tissue architecture — denser dermis, better hydration retention, stronger vascular support — occurring over a 4–8 week window following each session and compounding across the 3-session initial series.
Triple Board Certification: Dr. Querido holds board certifications in Family Medicine, Aesthetic Medicine, and Anti-Aging & Regenerative Medicine — a combination that is genuinely rare in a single practitioner. That third certification, in regenerative medicine, is particularly relevant for PDRN therapy: it means the treatment is being designed and delivered by someone who understands the underlying biology, not just the injection technique. “I chose to pursue regenerative medicine certification precisely because I wanted to offer treatments that work with the body’s own repair mechanisms,” Dr. Querido has noted. “PDRN is one of the most elegant examples of that philosophy in practice.” Learn more at the Greenwich MD About page.
Personally Performed: Every PDRN therapy session at Greenwich MD is administered by Dr. Querido directly — not delegated to a nurse practitioner or physician assistant. This matters for a treatment where precise placement, correct combination sequencing, and real-time assessment of tissue response directly determine outcomes. Patients are not handed off after an initial consultation; the physician who designed the protocol is the one delivering it, every time, across all three sessions of the initial series and at annual maintenance visits.
Integrative Approach: Dr. Querido does not treat PDRN as a product to be applied in isolation. Each protocol is built around the patient’s specific tissue concerns, combining PDRN with the most appropriate regenerative or rejuvenation treatment — whether that’s microneedling, RF microneedling, a skinbooster, or a hair restoration session. The combination approach is not a marketing strategy; it reflects well-documented synergy in the regenerative medicine literature, where PDRN’s receptor-level signaling amplifies the wound-healing response triggered by other modalities.
PDRN therapy can be applied to virtually any body area. At Greenwich MD, the most commonly treated areas include the face, under-eye area, neck, décolletage, hands, and scalp. Because PDRN functions as a biological amplifier rather than a filler or resurfacing agent, it is almost always delivered alongside another treatment — and that pairing is where its clinical value is highest. Below are the primary combination protocols offered.
Microneedling creates controlled micro-channels in the dermis, temporarily increasing tissue permeability and triggering the skin’s wound-healing response. Infusing or injecting PDRN into those channels immediately following the needling procedure allows the polynucleotides to reach fibroblast populations at depth with minimal barrier resistance. The result is a significantly amplified collagen-induction response compared to microneedling alone. This combination is particularly effective for fine lines, textural irregularities, enlarged pores, and early skin laxity. Visit the microneedling page for more detail on that modality.
Radiofrequency microneedling delivers thermal energy into the mid-dermis via insulated needles, creating coagulation zones that stimulate robust collagen remodeling over 3–6 months. Adding PDRN to an RF microneedling session provides immediate biological support to the repair response the RF energy initiates — essentially ensuring the fibroblasts mobilized by thermal injury have both the signaling stimulus (adenosine A2A activation) and the nucleotide substrate (PDRN’s salvage-pathway contribution) needed to rebuild efficiently. This pairing is one of the most powerful combinations available at Greenwich MD for moderate skin laxity and textural aging. See the Genius RF Microneedling page for full details.
Skinbooster injections deposit highly hydrophilic hyaluronic acid throughout the dermis to restore internal moisture and skin plumpness. PDRN complements this approach by improving the microenvironment those HA molecules are placed into — increasing fibroblast activity, supporting new capillary formation, and enhancing the tissue’s capacity to retain hydration over time. The combination is especially well-suited to the neck, décolletage, under-eye area, and hands, where skin is thin and conventional resurfacing carries higher risk.
On the scalp, PDRN works alongside PRP/PRF hair restoration or standalone hair loss protocols to improve the follicular microenvironment. Its angiogenic properties — the stimulation of new microvessel formation — are particularly relevant here, since follicular miniaturization in androgenetic alopecia is closely linked to reduced blood supply to the dermal papilla. PDRN helps restore the vascular and cellular conditions that healthy follicles depend on. More context on hair loss concerns is available at the hair loss page.
PDRN therapy at Greenwich MD is structured as a complementary add-on to other regenerative or rejuvenation treatments rather than a standalone session, so pricing is always discussed at consultation once the combination treatment plan has been determined. The table below outlines the protocol structure.
| Phase | Sessions | Interval | Pricing |
|---|---|---|---|
| Initial Series | 3 sessions | 30–45 days apart | Discussed at consultation |
| Annual Maintenance | 1 session per year | Yearly | Discussed at consultation |
Because PDRN is always paired with another treatment — microneedling, RF microneedling, skinbooster, or hair restoration — the final cost reflects the full combination protocol. Dr. Querido reviews all options and provides transparent pricing at the initial consultation before any treatment begins.
PDRN therapy is a well-tolerated regenerative treatment suitable for a wide range of skin types and concerns. It works best for patients who want progressive, biology-driven improvement rather than immediate cosmetic correction. The ideal candidate is committed to the full initial series of three sessions and understands that the most meaningful results emerge over 8–12 weeks following the final session in the series.
PDRN therapy is not appropriate for patients with a known allergy to fish or fish-derived products, given its salmon-origin source material. It is also deferred during active skin infections, open wounds at the treatment site, or periods of acute inflammatory skin conditions. Patients who are pregnant or breastfeeding should wait until after that period. Dr. Querido reviews full medical history and current medications at the consultation to confirm candidacy before any protocol is designed.
PDRN therapy at Greenwich MD is available to patients in Stamford, Greenwich, Darien, New Canaan, Westport, and Norwalk. To find out whether PDRN therapy is the right addition to a regenerative skin or hair protocol, schedule a consultation with Dr. Susana Querido at 1351 Washington Boulevard, Suite 803, Stamford, CT 06902 — where every treatment is designed and personally delivered by a triple board-certified physician.
Our Stamford clinic is conveniently located for patients throughout Fairfield County:
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