PDRN FAQ — Frequently Asked Questions | PDRN Care

Question 1

What is PDRN?

Accepted Answer

PDRN (Polydeoxyribonucleotide) is a purified mixture of DNA fragments extracted from salmon sperm cells. These fragments, ranging from 50 to 1500 kDa in molecular weight, activate the adenosine A2A receptor on skin cells, stimulating collagen production, tissue repair, and anti-inflammatory responses. PDRN is used in injectable skin boosters for facial rejuvenation, scar treatment, and wound healing.

Question 2

Is PDRN treatment safe?

Accepted Answer

PDRN has an excellent safety profile supported by extensive clinical research. Because the DNA fragments are thoroughly purified to remove all proteins and are too short to integrate into human cells, there is no risk of allergic reactions or genetic modification. The most common side effects are transient injection-site redness, mild swelling, and occasional bruising, which typically resolve within 24-48 hours. PDRN is contraindicated in individuals with known hypersensitivity to fish-derived products.

Question 3

What is the difference between PDRN and polynucleotides (PN)?

Accepted Answer

Both are DNA-derived biopolymers that activate the adenosine A2A receptor, but they differ in molecular weight. PDRN consists of shorter fragments (50-1500 kDa) that diffuse easily through tissue, while polynucleotides are longer chains (>1500 kDa) with gel-like viscoelastic properties. In practice, PDRN is preferred for broad-area skin rejuvenation and under-eye treatment, while PN products are favored for deeper biorestructuring and mild volumization.

Question 4

How many PDRN treatment sessions do I need?

Accepted Answer

A standard PDRN skin booster protocol involves 3-4 treatment sessions spaced 2-4 weeks apart during the induction phase. After completing the initial course, maintenance sessions every 3-6 months are recommended to sustain results. The exact number of sessions depends on the patient's skin condition, age, treatment goals, and the specific product used.

Question 5

When will I see results from PDRN treatment?

Accepted Answer

Initial improvements in skin hydration and glow are often noticeable within 1-2 weeks of the first session. However, the full benefits of PDRN treatment — improved elasticity, reduced fine lines, and enhanced skin texture — develop progressively over 2-3 months as new collagen matures. Results are cumulative across treatment sessions, with optimal outcomes typically seen 4-6 weeks after completing the initial 3-4 session course.

Question 6

How does PDRN work at the cellular level?

Accepted Answer

PDRN works through two mechanisms. First, intact PDRN fragments bind to adenosine A2A receptors on fibroblasts and endothelial cells, triggering cAMP-dependent signaling that promotes cell proliferation, collagen synthesis, new blood vessel formation, and anti-inflammatory responses. Second, as tissue enzymes break down the PDRN fragments, the released nucleotides enter the salvage pathway, providing raw materials for cellular DNA and RNA synthesis in metabolically stressed cells.

Question 7

Can I get PDRN treatment if I have a fish allergy?

Accepted Answer

Fish allergies are typically caused by parvalbumin and other proteins found in fish muscle tissue. PDRN undergoes extensive purification to remove all proteins, making allergic reactions extremely rare. However, as a precaution, PDRN treatment is generally contraindicated in patients with a documented hypersensitivity to fish or fish-derived products. Consult your treating physician if you have concerns about fish allergy.

Question 8

What areas of the body can be treated with PDRN?

Accepted Answer

PDRN skin boosters are most commonly used on the face (full-face rejuvenation via nappage technique), but they are also effective for the under-eye area, neck, decolletage, back of hands, and inner arms. Specialized PDRN formulations like Rejuran S are designed for targeted scar treatment on any body area. PDRN has also been studied for scalp rejuvenation and as an adjunct for wound healing in various anatomical locations.

Question 9

What are the different Rejuran products?

Accepted Answer

The Rejuran line by Pharmaresearch Products includes several variants: Rejuran Healer is the original full-face skin booster for general rejuvenation; Rejuran S is a higher-viscosity formulation designed for targeted scar treatment; Rejuran I (Eye) is optimized for the delicate periorbital area; and Rejuran HB combines PDRN with hyaluronic acid for enhanced hydration. All contain c-PDRN derived from salmon DNA but differ in concentration, viscosity, and intended application.

Question 10

What is the downtime after PDRN injection?

Accepted Answer

PDRN treatment has minimal downtime. Small papules (bumps) at injection sites are normal and typically flatten within 24-48 hours. Mild redness may persist for 1-2 days. Most patients can return to normal activities immediately, though it is recommended to avoid makeup, intense exercise, and direct sun exposure for 24 hours. The periorbital area may show slightly more swelling that resolves within 2-3 days.